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Meniscal root tear

96 citationsUpdated Oct 2026

For patients: a plain-language version of this topic is available. See the patient guide.

Overview

A meniscal root tear is defined as a radial tear or avulsion of the meniscal root from the tibial plateau that completely disrupts the circumferential fibers of the meniscus [3]. Biomechanically, this injury results in a loss of hoop stresses and an increase in contact forces, rendering it functionally equivalent to a total meniscectomy [3]. If left untreated, this functional equivalence leads to cartilage loss [5]. Lateral meniscal root tears are associated with ACL tears, whereas medial meniscal root tears are associated with chondral injuries [3]. Clinically, many patients with repairable meniscal root tears do not present with classic symptoms or signs of the injury [2].

Current consensus dictates that meniscal root tears should be clinically recognized, with strong consideration given to surgical repair in selected cases to anatomically restore the root and preserve joint health [6]. Acute meniscal root tears should be repaired early whenever possible [3]. Meniscus repair is the preferred initial intervention for medial meniscus root tears to prevent knee osteoarthritis [11, 18]. Repair is specifically advised when articular cartilage remains intact [12], and meniscal preservation should be prioritized over partial meniscectomy [15]. The treatment of chronic and degenerative meniscal root tears remains controversial, with indications continuing to evolve [3]. Definitive recommendations for root tears and meniscocapsular separations are lacking, and it remains unclear which patients are suitable candidates for surgical intervention or whether meniscectomy is ever an acceptable treatment [20, 26].

Meniscal root repairs in patients with no to mild osteoarthritis yield significantly improved patient outcomes and stall the progression of osteoarthritis [1]. Compared with nonoperative management and partial meniscectomy, repair leads to less arthritis progression, reduced rates of knee arthroplasty, and decreased overall societal healthcare costs [8, 12]. Meniscus root repair has demonstrated high satisfaction rates and superior outcomes to arthroscopic meniscectomy [7]. Both medial and lateral meniscus root repairs have shown favorable results, with no differences in outcomes between the two locations [12, 24]. Repair is associated with improved patient-reported outcomes and is a cost-saving intervention that prevents the early need for total knee arthroplasty [50, 69]. Meniscal repair may provide the greatest improvement in function and lowest risk of conversion to TKA compared with partial meniscectomy or conservative methods [49].

Anatomy & Pathophysiology

Meniscal Structure and Vascularity

The menisci are wedge-shaped fibrocartilaginous structures situated between the femoral condyles and tibial plateaus [94]. They consist of 65% to 75% water [27, 94, 107], with an extracellular matrix composed predominantly of type I collagen [27, 94, 107]. In the deeper zones, collagen fibers are oriented circumferentially and stabilized by intermittent radially oriented tie fibers [94]. Vascularity is distributed across three zones: the peripheral 10% to 30% is well vascularized by synovial and capsular branches [94], while the anterior and posterior root attachments are well vascularized by synovial branches [94]. This vascularity directly affects the ability of meniscal repairs to heal [107]. The zones are classified as follows: * Red/red zone: Outer third of the meniscus [94]. * Red/white zone: Middle third of the meniscus [94]. * White/white zone: Inner third of the meniscus [94].

Root Anatomy and Biomechanics

Meniscal root tears are defined as complete radial tears within one cm of the bony insertion or direct avulsion of the root attachment [44]. The roots are responsible for meniscal stability, which is necessary to preserve proper meniscal function [16]. Disruption of circumferential meniscal fibers leads to a loss of ability to transmit hoop stresses [82]. The meniscus contributes to joint homeostasis through lubrication, proprioception, and maintenance of the synovial microenvironment [44]. Biomechanical consequences vary by location: * Medial root tears: Result in peak articular cartilage contact pressure similar to that seen after a complete meniscectomy [107]. Posterior medial root tears can increase contact pressure, external rotation, and lateral tibial translation [82]. * Lateral root tears: A posterior lateral meniscus root tear increases lateral compartment contact pressure by approximately 50% [34]. A lateral root tear substantially decreases the contact area and increases contact pressure in the lateral compartment [82]. The biomechanical consequences of a lateral meniscus root tear depend on the state of the meniscofemoral ligament [133].

Pathophysiology and Clinical Consequences

If left untreated, meniscal root tears may lead to early onset arthritis, meniscal extrusion, joint-space narrowing, long-term knee dysfunction, and degenerative joint disease [16]. These injuries are frequently unrecognized and significantly alter knee biomechanics and kinematics, leading to accelerated degenerative changes [29]. Root tears combined with extrusion carry an odds ratio of 4.64 for early osteoarthritis progression [44]. Posterior meniscal root tears were explicitly implicated in 5 studies (38%) regarding an association with spontaneous osteonecrosis of the knee [56]. Injury patterns and associated risks include: * Medial posterior root: Less mobile than the lateral root, making it more susceptible to isolated injury [82]. * Lateral root: Most common in association with ligamentous injury [82]. Posterior lateral meniscus root tears are found in 7–12% of patients with a tear of the anterior cruciate ligament [34]. * ACL interaction: Injury to the lateral meniscus posterior root complex increases rotational and anterior laxity of the knee and places increased strain across reconstructed ACL grafts [110]. Anatomic ACL reconstruction with medial meniscal repair did not reveal significant differences in knee kinematics compared with the intact knee [98].

Classification

Definitions and Biomechanical Consequences

Meniscal root tears are defined as a radial tear or avulsion of the meniscal root from the tibial plateau [3, 4]. These injuries completely disrupt the circumferential fibers of the meniscus [3, 4], abolishing hoop stress transmission [44]. The resulting loss of hoop stresses leads to an increase in contact forces [3, 4], producing tibiofemoral contact mechanics equivalent to total meniscectomy [44]. Consequently, meniscal root tears are functionally equivalent to a total meniscectomy [3, 4] and interrupt the continuity of the circumferential fibers, leading to accelerated joint degeneration comparable to total meniscectomy [52]. Posterior horn radial tears adjacent to the medial meniscus root that extend to the meniscocapsular junction can lead to derangement of the loading profiles of the medial compartment that are similar to a root avulsion [170]. In the case of a lateral meniscus posterior root tear, the meniscofemoral ligament maintains meniscus function and stabilizes pressure in the lateral compartment [66].

Epidemiology and Demographics

Meniscal root tears account for 10–21% of all meniscal tears [44] and affect an estimated 100,000 patients annually in the United States [44]. The medial meniscus is torn approximately three times more often than the lateral meniscus [3, 4]. Lateral meniscus tears occur more commonly with acute ACL tears [3, 4], with an overall prevalence of posterior lateral meniscus root tears in patients undergoing ACL reconstruction of 14% [150]. Posterior root tears of the medial meniscus are more commonly degenerative and occur in patients older than 40 [19], whereas posterior root tears of the lateral meniscus are often associated with ACL tears in younger patients [19]. Persons with medial meniscus posterior root tear had significantly increased age, female sex predominance, higher BMI, increased Kellgren-Lawrence grade, greater varus mechanical axis angle, and lower sports activity level compared with persons with other types of meniscal tear [162]. In contrast, the mean age of patients with traumatic medial meniscus posterior root tears was 27.1 years [21]. Among these traumatic cases, 64% of patients were male [21], and 68% suffered concomitant injuries [21].

Associated Pathologies

Lateral root tears are associated with ACL tears [3, 4], while medial root tears are associated with chondral injuries [3, 4]. Following anterior meniscal root tears, meniscal tissue presents measurable, degenerative changes prior to changes within the articular cartilage [14].

Diagnostic Challenges

Meniscal root tears are frequently overlooked on MRI even when complete [19] and are difficult to see at arthroscopy [19]. The clinical diagnosis of meniscal root tears is limited by unspecific symptoms [54], and the atypical clinical presentation results in frequent diagnostic delay [44]. Anterior meniscus root injuries are relatively rare [30], and anterior meniscal root tears have not been reported in the context of the specific MRI findings described in the 2013 review [19].

Classification Systems

Meniscal tears can be classified according to location in relation to the vascular supply, position (anterior, middle, posterior third, root), and appearance and orientation [3, 4]. Meniscal root tears are not part of the ISAKOS classification of tear type 31 because they describe a location of tear rather than a pattern or appearance [19]. Most root tears are radial tears, with a much smaller number of complex tears [19], and are classified as a type of radial tear at the posterior root attachment of the meniscus [23]. A classification system for meniscal root tears based on tear morphology has been established [86].

Posterior Lateral Meniscus Root Tear (Arthroscopic): Posterior lateral meniscus root tears can be arthroscopically classified into three types: type 1 (avulsion of the root), type 2 (radial tear close to the root with an intact meniscofemoral ligament), and type 3 (complete detachment of the posterior meniscus horn) [150].

Posterior Lateral Meniscus Root Tear (Morphological): Posterior lateral meniscus root tears were classified based on arthroscopic findings as type I (oblique flap), type II (T shape), type III (longitudinal cleavage), or type IV (chronic inner loss) [51].

Clinical Presentation

History and General Presentation

Meniscal tears represent the most common knee injury necessitating surgery [3]. In young patients, traumatic meniscal tears typically follow sports-related injuries [3], whereas degenerative tears occur in older patients with an insidious onset [3]. Patients localize pain to the joint line or posterior knee and may describe mechanical symptoms such as locking or catching [33]. With an acute tear, effusion often develops several hours after injury [33], while chronic tears present with intermittent effusions and mechanical symptoms [33]. Patients with traumatic meniscal tears may report pain onset during a twisting mechanism or deep knee flexion [135]. Approximately one-half to two-thirds of patients with a traumatic meniscal tear report knee swelling [135]. Mechanical symptoms, including catching or frank locking, have been reported in 12% to 69% of patients with meniscal tears [135]. Meniscus root tears are frequently unrecognized injuries that significantly alter knee biomechanics and kinematics [29], and many often go unrecognized initially [16].

Physical Examination

Small joint effusions and joint line tenderness with palpation are common findings with meniscal tears [33]. Range of motion is typically normal, though longitudinal bucket-handle tears may block full extension [33]. Joint line tenderness was found to be an accurate test in 81% to 90% of patients with an isolated meniscal tear [135]. The McMurray test was accurate in 57% to 77% of patients with an isolated meniscal tear [135]. The Thessaly test, where the patient flexes the knee to 20° while standing on the affected extremity and twists in internal and external rotation, was accurate in 61% to 80% of patients with an isolated meniscal tear [135] and often reproduces pain [33]. A varus stress test in full extension can detect anteromedial meniscal extrusion, a clinical sign of medial meniscus root avulsion [92]. Clinical examination by an experienced examiner using multiple meniscus tests is sufficient for a diagnosis of a meniscal tear [102].

Imaging and Diagnostic Findings

MRI remains the noninvasive diagnostic procedure of choice for confirming meniscal pathology [33] and is considered the gold standard of diagnosis for a meniscal root tear [54]. MRI has demonstrated a high negative predictive value for meniscal tears [33], although the accuracy of the clinical diagnosis is 70% to 75% [33]. Three direct MRI signs for the diagnosis of a meniscus root tear are a radial linear defect in the axial plane, a vertical linear defect (truncation sign) in the coronal plane, and the ghost meniscus sign in the sagittal plane [54]. Meniscal extrusion is an indirect sign of a root tear but is less common in lateral root tears [54]. Radial root tears demonstrate a fluid cleft on coronal MRI images and often exhibit a ghost meniscus on consecutive sagittal images [19]. A study of 3.0-T MRI for detecting posterior meniscal root tears found a sensitivity of 77% and a specificity of 73% [135]. The decreased accuracy of MRI for diagnosing root tears may be attributable to the radial orientation of many posterior root tears [135]. Medial meniscus posterior root tears may be missed on MRI diagnosis in patients with severe medial instability from trauma [55]. Anterior meniscus root injuries can be diagnosed preliminarily based on clinical manifestations, physical examinations, and MRI, then confirmed by arthroscopic exploration [30].

Associated Pathologies and Demographics

Lateral meniscus root tears are associated with ACL tears [3], while medial meniscus root tears are associated with chondral injuries [3]. Posterior horn meniscal root tears are more commonly seen in overweight, middle-aged females and are associated with concomitant cruciate ligament and cartilage injuries [53]. Most patients with traumatic medial meniscus posterior root tears suffer concomitant injuries (68%) [21]. The mean age of patients with traumatic medial meniscus posterior root tears is 27.1 years, with 64% being male [21]. A unique link exists among ramp lesions, root tears, meniscal horn tears, and posterior medial tibial plateau injuries [114].

Investigations

Clinical Presentation and History

Meniscal root tears are frequently unrecognized in the initial clinical assessment [16]. Differentiating an acute meniscal tear from an anterior cruciate ligament (ACL) injury relies on the timing of effusion development; meniscal tears typically present with swelling several hours after injury, whereas ACL injuries exhibit rapid swelling within the first few hours [33].

Physical Examination

Manipulative maneuvers such as the McMurray and Apley tests may elicit a palpable or audible click with localized tenderness, but these findings lack specificity for meniscal pathology [33]. The Thessaly test, performed by flexing the knee to 20° while standing on the affected extremity and twisting in internal and external rotation, often reproduces pain in patients with meniscal tears [33]. Range of motion is typically normal, although longitudinal bucket-handle tears may block full extension [33]. Patients may also report tightness in flexion if an effusion is present [33].

Imaging: Radiographs

Plain radiography: Standard knee radiographs are obtained to evaluate for bone injuries or abnormalities [33]. A weight-bearing radiograph is necessary to assess for osteoarthritis [33]. A right-to-left difference of at least 2 mm on weight-bearing radiographs represents a significant discrepancy that will be verified by articular cartilage chondrosis at the time of arthroscopy [33].

Imaging: Magnetic Resonance Imaging (MRI)

MRI: In the grade III MRI classification, increased signal intensity reaches the articular surface of the meniscus [33]. A well-performed MRI of a knee with no meniscal pathology will rarely demonstrate a tear [33]. The diagnostic validity of MRI is similar for meniscal tears in acute knee trauma and in knee symptoms lasting over 6 months in young adults [73]. Findings of medial meniscal root tears are characteristic compared with control groups [13]. Direct attention to the meniscal roots improves radiologic diagnosis [19]. Both coronal and sagittal images must be inspected, following the roots to their insertion points [19]. Fluid-sensitive sequences are often the most helpful for diagnosing radial root tears because fluid dissects into many radial root tears and artifactual signal may mimic tears [19]. Radial root tears demonstrate a fluid cleft on coronal images and often exhibit a ghost meniscus on consecutive sagittal images [19]. Posterior root tears of the medial meniscus may exhibit more irregular morphologic distortion and abnormal signal than the typical cleft and ghost meniscus seen in lateral root tears [19]. Medial meniscus posterior root tears are often missed on MRI diagnosis [55]. MRI contributes to enhancing the diagnostic accuracy of an unhealed meniscal repair when there are limited clinical signs of meniscal pathology [70]. Confusion between meniscal fraying and small tears is a major source of discrepancy between MRI and surgical findings [167]. Magnetic resonance imaging is not an effective or efficient predictor of reparability of meniscal tears with the current arthroscopic criteria [172]. MRI is not always useful in predicting reparability of symptomatic isolated lateral semilunar meniscus tears, and most of the symptomatic cases with normal MRI were reparable [153]. High-resolution magnetic resonance imaging can predict osteoarthritic progression after medial meniscus posterior root injury [10].

Imaging: Ultrasound

Ultrasound: Medial root tears lead to significantly decreased dynamic medial displacement of the meniscus compared to healthy meniscus status on ultrasound examination [176]. Meniscal extrusion greater than 3 mm on ultrasound is suggestive of combined posterior medial meniscal root and meniscotibial ligament lesions [178].

Arthroscopy

Arthroscopy: Arthroscopy is considered the gold standard for confirming the presence of posterior meniscus root tears and avulsions [57]. Meniscus root tears or avulsions diagnosed at arthroscopy are defined as a complete meniscus root detachment within 9 mm of the root attachment and confirmed by arthroscopic probing with a calibrated probe [57]. Specific attention to the roots can aid arthroscopic diagnosis [19].

Treatment

Non-Operative

In the absence of intermittent swelling, catching, and locking, meniscal tears—particularly degenerative tears—may be treated conservatively [3]. Arthroscopic partial meniscectomy should not be proposed as a first-line treatment for degenerative meniscus lesions; non-operative treatment should always be started first, with surgery only envisaged after its failure [116]. However, nonoperative management of medial meniscal root tears is associated with poor outcomes compared to surgical intervention [20]. Meniscal root repair leads to significantly less arthritis progression and subsequent knee arthroplasty compared with nonoperative management in a matched cohort based on patient characteristics [8]. The available evidence suggests meniscus repair should be adopted as the preferred initial intervention for medial meniscus root tears to prevent knee osteoarthritis, despite additional evidence regarding nonoperative management [18]. Meniscal repair may provide the greatest improvement in function and lowest risk of conversion to total knee arthroplasty when compared with partial meniscectomy or conservative methods [49].

Operative

Indications: Acute meniscal root tears should be repaired early; the treatment of chronic tears is more controversial [3]. Repair of meniscal root tears is advised when articular cartilage remains intact because both medial and lateral meniscus root repairs have demonstrated favorable results, decreased rates of osteoarthritis and arthroplasty compared with partial meniscectomy, and decreased overall societal healthcare costs [12]. Surgical indications for meniscus root repair include a symptomatic tear that has failed nonsurgical management, minimal osteoarthritis, and no significant joint malalignment, which may jeopardize healing [82]. Indications for surgical repair of meniscal root tears include young patients with traumatic tears and excellent chondral health [122]. Although surgical intervention aims to improve the known poor outcomes associated with nonoperative management of medial meniscal root tears, it is unclear which patients are suitable candidates, and there is not yet clear consensus on indications or whether meniscectomy is ever an acceptable treatment [20]. An evidence-based individualized approach focusing on clinical outcomes and value is essential, though definitive recommendations for root tears and meniscocapsular separations remain lacking [26]. Meniscal surgery can be performed with the correct timing and the proper indication even in the presence of early osteoarthritis, as there is a relevant regenerative potential of the meniscus and the surrounding cartilage that should be taken into account [125]. Therapeutic concepts for meniscal root injuries should not be based strictly on localization (medial or lateral) but on etiology (traumatic vs. nontraumatic), integrating factors such as deformity correction and degenerative changes [22].

Surgical Approach / Technique: Four techniques are commonly used for meniscal repair: open, “outside-in,” “inside-out,” and “all-inside” [3]. The gold standard for meniscal repair remains the inside-out technique with vertical mattress sutures [3]. Newer techniques for all-inside repairs are popular because of their ease of use [3]. The latest generation of “all-inside” devices allows tensioning of the construct [3]. Regardless of the technique used, it is essential that the saphenous nerve branches (anterior to both the semitendinosus and gracilis muscles and posterior to the inferior border of the sartorius muscle) be protected during medial repairs, and the peroneal nerve (posterior to the biceps femoris) during lateral repairs [3]. The author strongly recommends that when a meniscus root tear is seen, the transtibial pullout root repair technique be considered over a side-to-side repair [63]. There is no consensus on the optimal repair technique, but a locking suture technique has demonstrated biomechanical superiority to a nonlocking construct [82]. The holding strength and short-term follow-up healing rates using all-inside suture-based fixators approach that of inside-out suture fixation [122]. The advantages of all-inside devices are the ease of use and elimination of accessory surgical incisions [122]. The disadvantages of all-inside devices are meniscal damage from deployment of the fixator, difficulty in obtaining a vertical repair, and the cost [122]. Proper selection and preparation of meniscal tears and avoidance of vascular damage by aiming needles away from neurovascular structures and by setting the needle stop at 14 mm or 16 mm are necessary to penetrate the peripheral rim without over-penetrating and resulting in complications [122]. Mattress sutures are passed through both superior and inferior sutures; use of curved needles makes this easier [122]. Posterior sutures are placed first or, in the case of a bucket-handle meniscal tear, the meniscus is reduced with a mid-body suture first [122]. Sutures must not be over-tightened to avoid their cutting through the tissues [122]. Proper tensioning of root repair is a clinical pearl for the treatment of meniscal root tears [122]. Proper anatomic placement of root repair on tibia is a clinical pearl for the treatment of meniscal root tears [122]. Intimate knowledge of root insertional anatomy is essential for restoration of meniscal function [122]. Unstable root tears of the posterior horn of the medial or lateral meniscus may be repaired to a freshened posterior bony bed using an anterior crucial ligament guide to drill from the anterolateral tibia to the base of the root footprint [147]. A suture shuttle device is used to pass simple sutures through the meniscus and then out through the bone tunnel; the sutures are then tied anteriorly [147]. The repair also may be accomplished using a 2.7 suture anchor placed through a high posteromedial portal [147]. Root tears of the lateral meniscus may do well by rasping and allowing them to heal in situ [147]. Synovial rasping followed by longitudinal repair, consisting of two longitudinal sutures on the superior surface and one on the inferior surface, is indicated in young patients willing to follow stringent postoperative protocol for radial tears that extend to the capsule [147]. The non-anatomic reinsertion of the anterior horn of the lateral meniscus is a simple salvage procedure for cases of anterior root of the lateral meniscus amputation that provides satisfactory clinical outcomes after 2-year follow-up preserving the meniscal remnant [74].

Outcomes and Biomechanics: Surgical repair of medial meniscus posterior root tears appears to result in highly satisfying subjective outcomes with statistically and clinically significant improvement [109]. Meniscus root repairs are cost beneficial and prevent the early need for total knee arthroplasty, with most patients showing significantly improved patient-reported outcomes, though further clinical outcome studies and refinement of surgical technique are necessary to prevent recurrent meniscal extrusion [69]. Transtibial root repair for medial and lateral posterior meniscal root tears demonstrated significantly improved clinical outcomes at 2 years postoperatively [41]. Although good to excellent clinical outcomes were attained in select patients for both medial and lateral meniscus root repair, lateral meniscal root tears may have better results after repair, suggesting that differences in injury and patient characteristics may contribute to differences in these outcomes [127]. This finding suggests that either technique can be reliably used in clinical practice to preserve joint function and potentially reduce the risk of osteoarthritis progression following posterior medial meniscus root tear repairs [9]. Meniscal root repair did not halt but rather reduced the progression of osteoarthritis [10]. The root tear that has similar effects as total meniscectomy will cause cartilage loss if not treated [5]. Arthroscopic pullout suture repair is an effective treatment for alleviating meniscal symptoms in patients with a symptomatic posterior root tear of the medial meniscus with degenerated articular cartilage of less than grade III [36]. Satisfactory clinical outcomes are achievable for radial meniscal tear repair at short-term follow-up [47]. Meniscal preservation with repair of radial tears results in improved short-term clinical outcomes, however, long-term outcomes remain unknown [35]. In general, success rate is 90% when meniscal repair is performed in conjunction with an ACL reconstruction, 60% when meniscal repair is performed in a knee with an intact ACL, and 30% when meniscal repair is performed in a knee with a deficient ACL [3]. Meniscal repair is effective over the medium and long term in 70 to 80% of cases, with indications extending to radial lesions and specific unstable knee scenarios, while surgical techniques continue to simplify and focus on biological environments [78]. However, follow-up MRI scans did not show complete healing of all repaired root tears [77]. Poor results following posterior medial meniscus root repair have been reported in morbidly obese patients (body mass index > 35) and those with severe chondrosis or varus malalignment greater than 5° [82].

Rehabilitation: Rehabilitation following meniscus repair should involve avoidance of knee flexion beyond 90 degrees; the level of allowed weight bearing is controversial [3]. A conservative postoperative rehabilitation program is recommended following meniscus root repair, with non–weight bearing for a period of 4 to 6 weeks and avoidance of deep knee flexion for at least 12 weeks postoperatively [82].

Salvage Procedures: Meniscal allograft transplantation has been reserved for the patient who remains symptomatic in activities of daily living after partial or total meniscectomy or who develops recurrent pain after partial or total meniscectomy [27]. Meniscal allograft transplantation is usually reserved for patients who are skeletally mature but younger than 50 years [27]. Contraindications for meniscal allograft transplantation include uncorrected lower extremity malalignment, uncorrected ligamentous instability, inflammatory arthritis, and significant chondral changes in the treated compartment [27]. Return to strenuous sports generally is not recommended after meniscal allograft transplantation [27]. A long-term benefit for preventing the progression of osteoarthritis has not been established for meniscal allograft transplantation [27]. Technically, grafts have performed better when placed with a bone block or plug [27]. Preservation of at least some peripheral rim is important to prevent peripheral extrusion [27]. Positive outcomes for meniscal allograft transplantation are most likely to be achieved when performed in appropriately selected patients, with studies reporting long-term graft survivorship as high as 89% at 10 years and significant improvements in multiple patient reported outcome measures [48]. Meniscal replacement continues to evolve using bone-plug techniques with better-defined indications and more asymptomatic results (> 90%) [131]. In a meta-analysis evaluating meniscal transplants, lateral transplants performed better than medial transplants [131]. At 5- to 10-year follow-up, approximately 85% of meniscal transplants survived; at longer than 10-year follow-up, survival rates of approximately 55% are reported [131]. Meniscal allograft is indicated in a patient who has had a previous meniscectomy, who is 50 years or younger, and who has symptoms localized to the tibiofemoral compartment and no advanced arthrosis as evidenced by flattening of the condyles or excessive osteophyte formation [131]. A joint space of 2 mm or greater on standing posteroanterior view is necessary for meniscal allograft transplantation [131]. Contraindications for meniscal allograft transplantation include malalignment, instability that the patient does not wish to have corrected, chondromalacia greater than grade III, and previous joint infection [131]. The patient should be motivated, well informed, and willing to decrease impact-loading activities for meniscal allograft transplantation [131]. Best results are obtained with a meniscal allograft that has a bone block or a bone bridge attached [131]. Cryopreserved menisci have been shown to perform similar to fresh frozen menisci with similar risks, in particular that of acquired immunodeficiency syndrome (AIDS; 1 in 1.6 million) [131]. Investigational studies of biologic tissue scaffolds for partial or complete meniscal replacement are in progress [131]. These grafts may provide more acceptable replacements in the future, but at this time results are short term and limited in number [131]. Meniscal transplantation is contraindicated in knees with diffuse arthritic changes, morbid obesity, age over 50 years, or unaddressed ligamentous instability, limb malalignment, or chondral defects [45]. Allografts may be implanted with the meniscal soft tissue only, secured to the capsule and root attachment sites through standard repair techniques, or with a bone block including the bony insertion of the anterior and posterior meniscal roots inserted into a prepared bone trough in the recipient’s knee [45]. Use of an allograft with a bone block is more common for lateral meniscus transplantation because of the minimal distance between anterior and posterior root attachments making soft-tissue fixation more difficult [45]. Both medial and lateral meniscal allograft transplantation result in significant improvements in pain, quality of life, and functional outcomes compared with preoperative scores, even despite progressive joint space narrowing at long-term follow-up [45]. Meniscal transplantation allows patients to return to the same level of athletic competition 75% to 85% of the time [45]. Overall failure rate (conversion to total knee arthroplasty) ranges from 10% to 29% in long-term follow-up for meniscal transplantation [45]. Although the survivorship of meniscal transplantation is imperfect, the procedure provides patients the ability to improve quality of life and delay arthroplasty [45].

Complications

Biomechanical Consequences

Meniscal root tears abolish hoop stress transmission, producing tibiofemoral contact mechanics equivalent to total meniscectomy [44]. These injuries expose articular cartilage to abnormal forces comparable to those following total meniscectomy [16]. Consequently, meniscal root tears significantly alter knee biomechanics and kinematics, leading to accelerated degenerative changes [29]. The loss of structural integrity may result in meniscal extrusion [16], joint-space narrowing [16], long-term knee dysfunction [16], and degenerative joint disease [16].

Osteoarthritis and Joint Degeneration

Untreated meniscal root tears may lead to early onset arthritis [16]. In patients with no to mild osteoarthritis, meniscal root repairs stall the progression of osteoarthritis [1]. Meniscus root repair leads to significantly less arthritis progression compared with nonoperative management and partial meniscectomy [8]. Repair of meniscal root tears is associated with decreased rates of osteoarthritis compared with partial meniscectomy [12]. Suture anchor and transtibial pullout refixation of posterior medial meniscus root tears can potentially reduce the risk of osteoarthritis progression [9].

Diagnostic Challenges

Meniscal root tears are frequently unrecognized injuries [29]. Due to frequent diagnostic delay, these injuries have been designated a "silent epidemic" [44].

Surgical Complications and Outcomes

All-inside devices for meniscal root repair carry risks of meniscal damage and difficulty in obtaining a vertical repair [17]. The structural problem of torn medial meniscus posterior roots can negatively affect meniscal healing, function, and long-term survival after root repair [81]. A meniscectomy after meniscal repair is performed infrequently [143]. Meniscal root repair has been demonstrated to have superior outcomes to arthroscopic meniscectomy for root tears [7]. In medial meniscus posterior root tears, root repair was superior to partial meniscectomy in terms of clinical results for at least 10 years of follow-up [79]. Meniscal repair may provide the lowest risk of conversion to total knee arthroplasty when compared with partial meniscectomy or conservative methods [49]. Repair of meniscal root tears is associated with decreased rates of arthroplasty compared with partial meniscectomy [12]. Medial meniscal root repair is associated with a reduced rate of knee replacement [25]. Meniscus root repair leads to significantly less subsequent knee arthroplasty compared with nonoperative management and partial meniscectomy [8].

Recovery

Light activity (weeks): The provided evidence does not specify a typical week range for desk work, driving, or light activities of daily living.

Full activity (months): The provided evidence does not specify a month range for manual work, sport, or full range-of-motion and strength return.

Complete recovery / outcome plateau (months): The provided evidence does not specify a month range for the stabilization of pain, strength, and final functional outcomes.

Rehabilitation protocol: The provided evidence does not detail specific physical therapy phasing, immobilisation duration, weight-bearing or range-of-motion progression, or brace removal timing.

Functional milestones: The number of patients who perceived substantial clinical improvement five years after surgical repair of medial meniscal root tears was relatively small [181].

Other Considerations: Meniscal repair is associated with a lower progression to knee osteoarthritis at approximately six years of follow-up compared to partial meniscectomy [180]. However, two years of follow-up is insufficient for meniscal repairs, as success rates can deteriorate significantly over longer periods, and a perspective considerably longer than 6.6 years is necessary to evaluate the ultimate goal of reducing degenerative arthritis [179]. Age of 40 years or older is not associated with an increased risk of meniscal repair failure at 5 years, although a shorter time to failure was noted in this age cohort [182].

Regarding natural history and osteoarthritis progression, meniscal tissue presents measurable, degenerative changes prior to changes within the articular cartilage after anterior meniscal root tears [14]. At a mean of 10 years' follow-up of posterior lateral meniscus root tears left in situ, mild lateral joint-space narrowing was measured without significant differences in subjective or objective scores compared with controls [40]. At 10 to 20 years after diagnosis, on average, 50% of those with a diagnosed anterior cruciate ligament or meniscus tear have osteoarthritis with associated pain and functional impairment [76].

Surgical technique and biomechanics influence long-term outcomes. The structural problem of torn medial meniscal posterior root tears can negatively affect meniscal healing, function, and long-term survival after root repair [81]. A specific biomechanical profile may be important for increasing the likelihood of healing and may translate to improved long-term outcomes for patients undergoing meniscus root repair [83]. The long-term evaluation of anterior cruciate ligament–reconstructed knees with concurrent successful meniscal repairs demonstrated a low rate of radiographic arthritis [183]. One proposed method is conceptually straightforward, relatively inexpensive, and without undue surgical risk, but must still demonstrate it can be performed safely and effectively in an arthroscopic fashion and maintain meniscal root stability over time to be widely accepted [184]. Authors look forward to long-term clinical outcome results after repair of medial meniscus root tears with this technique [46]. In one case, an injury resulted in long-term, chronic pain for the patient and was resolved with an anterior medial meniscus root repair [75].

Key Evidence

• [L5] Meniscal root repairs in patients with no to mild osteoarthritis yield significantly improved patient outcomes and stall the progression of osteoarthritis. [1] (10.1016/j.csm.2019.08.009)
• [L4] The study demonstrates that many patients with repairable meniscal root tears do not present with classic symptoms or signs of meniscal root tears. [2] (10.1016/j.jisako.2023.03.260)
• [L4] The root tear that has similar effects as total meniscectomy will cause cartilage loss if not treated. [5] (10.1177/2325967117s00054)
• [L5] Current consensus is that meniscal root tears should be clinically recognized, and strong consideration should be given to surgical repair in selected cases by utilizing techniques designed to anatomically restore the root, maximize meniscal function, and preserve the health of the knee joint. [6] (10.1016/j.csm.2011.08.013)
• [L5] Meniscal root repair has been demonstrated to have high satisfaction rates and superior outcomes to arthroscopic meniscectomy for root tears. [7] (10.1016/j.arthro.2019.02.010)
• [L3] Meniscus root repair leads to significantly less arthritis progression and subsequent knee arthroplasty compared with nonoperative management and partial meniscectomy in a matched cohort based on patient characteristics. [8] (10.1177/0363546519888212)
• [L5] This finding suggests that either technique can be reliably used in clinical practice to preserve joint function and potentially reduce the risk of osteoarthritis progression following posterior medial meniscus root tear repairs. [9] (10.1002/ksa.12513)
• [L2] Meniscal root repair did not halt but rather reduced the progression of osteoarthritis. [10] (10.1016/j.jisako.2024.03.015)
• [L5] The authors agree that the articles Dr Filbay brought to her attention provide useful additional evidence about potential outcomes of nonoperatively managed patients, but the data do not alter our conclusion that the available evidence suggests meniscus repair should be adopted as the preferred initial intervention for medial meniscus root tears. [11] (10.1177/0363546518783956)
• [L4] Repair of meniscal root tears is advised when articular cartilage remains intact because both medial and lateral meniscus root repairs have demonstrated favorable results, decreased rates of osteoarthritis and arthroplasty compared with partial meniscectomy, and decreased overall societal healthcare costs. [12] (10.5435/jaaos-d-19-00102)
• [L3] The findings of medial meniscal root tear were characteristic as compared with the control group. [13] (10.1007/s00167-011-1794-4)
• [L5] The results suggest that meniscal tissue presents measurable, degenerative changes prior to changes within the articular cartilage after anterior meniscal root tears. [14] (10.1177/2325967117702452)
• [L5] Meniscal preservation should always be the first thought over partial meniscectomy, with a focus on extending indications, using biologic enhancement, and addressing specific tear types like posterior horn and root tears. [15] (10.1016/j.csm.2011.09.005)
• [L4] [16] (10.1007/s00167-014-3073-7)
• [L5] The authors of the original systematic review maintain that meniscus repair should be adopted as the preferred initial intervention for medial meniscus root tears to prevent knee osteoarthritis, despite the additional evidence presented regarding nonoperative management. [18] (10.1177/0363546518783958)
• [L4] [19] (10.1016/j.csm.2013.03.005)
• [L5] Although surgical intervention aims to improve the known poor outcomes associated with nonoperative management of medial meniscal root tears, it is unclear which patients are suitable candidates, and there is not yet clear consensus on indications or whether meniscectomy is ever an acceptable treatment. [20] (10.1016/j.arthro.2024.12.020)
• [L5] [21] (10.1177/03635465241237254)
• [L5] Therapeutic concepts for meniscal root injuries should not be based strictly on localization (medial or lateral) but on etiology (traumatic vs. nontraumatic), integrating factors such as deformity correction and degenerative changes. [22] (10.1016/j.arthro.2023.03.012)
• [L3] There were no differences in outcomes between patients who underwent medial versus lateral arthroscopic meniscus root repair surgery. [24] (10.1177/2325967116s00162)
• [L5] Medial meniscal root repair is associated with improved patient-reported outcomes and a reduced rate of knee replacement. [25] (10.1016/j.arthro.2025.01.005)
• [L5] An evidence-based individualized approach focusing on clinical outcomes and value is essential, though definitive recommendations for root tears and meniscocapsular separations remain lacking. [26] (10.5435/jaaos-d-21-01153)
• [L5] Meniscal root tears are frequently unrecognized injuries that significantly alter knee biomechanics and kinematics, leading to accelerated degenerative changes. [29] (10.1177/0363546514524162)
• [Case_report] Anterior meniscus root injuries are relatively rare and can be diagnosed preliminarily based on clinical manifestations, physical examinations, and MRI, then confirmed by arthroscopic exploration. [30] (10.1186/s12891-020-03671-x)
• [L5] [34] (10.1007/s00167-014-2904-x)
• [L1] Meniscal preservation with repair of radial tears results in improved short-term clinical outcomes, however, long-term outcomes remain unknown. [35] (10.1016/j.arthro.2016.03.029)
• [L4] Arthroscopic pullout suture repair is an effective treatment for alleviating meniscal symptoms in patients with a symptomatic posterior root tear of the medial meniscus with degenerated articular cartilage of less than grade III. [36] (10.1016/j.arthro.2009.03.018)
• [L3] At a mean of 10 years' follow-up of posterior lateral meniscus root tears left in situ, mild lateral joint-space narrowing was measured without significant differences in subjective or objective scores compared with controls. [40] (10.1177/0363546511398212)
• [L3] Transtibial root repair for medial and lateral posterior meniscal root tears demonstrated significantly improved clinical outcomes at 2 years postoperatively. [41] (10.1177/23259671221079794)
• [Paper] [44] (10.1016/j.jisako.2026.101202)
• [L4] The authors look forward to long-term clinical outcome results after repair of medial meniscus root tears with this technique. [46] (10.1007/s00167-009-0749-5)
• [L3] Satisfactory clinical outcomes are achievable for radial meniscal tear repair at short-term follow-up. [47] (10.1177/0363546518786035)
• [L5] Positive outcomes for meniscal allograft transplantation are most likely to be achieved when performed in appropriately selected patients, with studies reporting long-term graft survivorship as high as 89% at 10 years and significant improvements in multiple patient reported outcome measures. [48] (10.1007/s00167-020-06058-6)
• [L4] In patients who experience meniscal root tears, meniscal repair may provide the greatest improvement in function and lowest risk of conversion to TKA when compared with partial meniscectomy or conservative methods. [49] (10.1016/j.asmr.2020.02.005)
• [L1] Repair of medial meniscus root tears, as compared with total meniscectomy and nonsurgical treatment, leads to less osteoarthritis and is a cost-saving intervention. [50] (10.1177/0363546518755754)
• [L4] Posterior lateral meniscus root tears were classified based on arthroscopic findings: type I, oblique flap; type II, T shape; type III, longitudinal cleavage; or type IV, chronic inner loss. [51] (10.1016/j.arthro.2009.07.007)
• [L5] Meniscal root tears interrupt the continuity of the circumferential fibers, leading to accelerated joint degeneration comparable to total meniscectomy. [52] (10.1177/2325967119s00465)
• [L4] Posterior horn meniscal root tears are more commonly seen in overweight, middle-aged females and are associated with concomitant cruciate ligament and cartilage injuries. [53] (10.1016/j.arthro.2013.07.073)
• [Paper] [54] (10.1007/s00402-013-1873-8)
• [L4] Medial meniscus posterior root tear may occur in severe medial instability from trauma and is often missed on MRI diagnosis. [55] (10.1007/s00167-014-3274-0)
• [L4] [56] (10.1177/0363546517743734)
• [L2] [57] (10.1007/s00167-014-3395-5)
• [L5] The author strongly recommends that when a meniscus root tear is seen, the transtibial pullout root repair technique be considered over a side-to-side repair. [63] (10.1016/j.arthro.2017.11.009)
• [L5] In the case of a root tear of the lateral meniscus, the MFL maintains meniscus function and stabilizes the pressure in the lateral compartment. [66] (10.1016/j.arthro.2014.02.040)
• [L5] Meniscus root repairs are cost beneficial and prevent the early need for total knee arthroplasty, with most patients showing significantly improved patient-reported outcomes, though further clinical outcome studies and refinement of surgical technique are necessary to prevent recurrent meniscal extrusion. [69] (10.1016/j.arthro.2023.06.023)
• [L3] The clinical relevance of this finding is that MRI contributes to enhancing the diagnostic accuracy of an unhealed meniscal repair when there are limited clinical signs of meniscal pathology. [70] (10.1007/s00167-019-05523-1)
• [L2] The diagnostic validity of magnetic resonance imaging is similar for meniscal tears in acute knee trauma and in knee symptoms lasting over 6 months in young adults. [73] (10.1177/0363546508329543)
• [L4] The non-anatomic reinsertion of the anterior horn of the lateral meniscus is a simple salvage procedure for cases of anterior root of the lateral meniscus amputation that provides satisfactory clinical outcomes after 2-year follow-up preserving the meniscal remnant. [74] (10.1016/j.otsr.2019.04.007)
• [L4] This injury resulted in long-term, chronic pain for the patient and was resolved with an anterior medial meniscus root repair. [75] (10.1007/s00167-014-2941-5)
• [L4] At 10 to 20 years after diagnosis, on average, 50% of those with a diagnosed anterior cruciate ligament or meniscus tear have osteoarthritis with associated pain and functional impairment. [76] (10.1177/0363546507307396)
• [L4] However, follow-up MRI scans did not show complete healing of all repaired root tears. [77] (10.1177/0363546512439181)
• [L5] Meniscal repair is effective over the medium and long term in 70 to 80% of cases, with indications extending to radial lesions and specific unstable knee scenarios, while surgical techniques continue to simplify and focus on biological environments. [78] (10.1016/j.otsr.2009.09.004)
• [L3] In medial meniscus posterior root tears, root repair was superior to partial meniscectomy in terms of clinical results for at least 10 years of follow-up. [79] (10.1177/0363546520920561)
• [L4] The structural problem of torn MMPRs can negatively affect meniscal healing, function, and long-term survival after root repair. [81] (10.1177/0363546519876110)
• [L5] This biomechanical profile may be important for increasing the likelihood of healing and may translate to improved long-term outcomes for patients undergoing meniscus root repair. [83] (10.1177/03635465251342267)
• [L4] This study demonstrated that it was possible to establish a concise classification system to group patients with meniscal root tears by tear morphology. [86] (10.1177/0363546514559684)
• [L4] [92] (10.1007/s00167-011-1550-9)
• [L5] Anatomic ACL reconstruction with medial meniscal repair did not reveal significant differences in knee kinematics compared with the intact knee. [98] (10.1007/s00167-014-3071-9)
• [L2] Clinical examination by an experienced examiner using multiple meniscus tests is sufficient for a diagnosis of a meniscal tear. [102] (10.1007/s00167-011-1636-4)
• [L4] Surgical repair of medial meniscus posterior root tears appears to result in highly satisfying subjective outcomes with statistically and clinically significant improvement. [109] (10.1055/s-0040-1710565)
• [L5] This cadaveric biomechanical study suggests injury to the LM posterior root complex increases rotational and anterior laxity of the knee and places increased strain across reconstructed ACL grafts. [110] (10.1016/j.asmr.2020.11.005)
• [L4] This report indicates a unique link among ramp lesions, root tears, meniscal horn tears, and posterior medial tibial plateau injuries, suggesting a 'terrible triad' with difficult management and poor prognosis. [114] (10.1016/j.arthro.2024.06.011)
• [L5] Arthroscopic partial meniscectomy should not be proposed as a first-line treatment for degenerative meniscus lesions; non-operative treatment should always be started first, with surgery only envisaged after its failure. [116] (10.1007/s00167-017-4458-1)
• [L4] Meniscal surgery can be performed with the correct timing and the proper indication even in the presence of early osteoarthritis, as there is a relevant regenerative potential of the meniscus and the surrounding cartilage that should be taken into account. [125] (10.1007/s00167-016-4069-2)
• [L3] Although good to excellent clinical outcomes were attained in select patients for both medial and lateral meniscus root repair, LMRTs may have better results after repair, suggesting that differences in injury and patient characteristics may contribute to differences in these outcomes. [127] (10.1016/j.arthro.2019.11.098)
• [L5] The biomechanical consequences of a lateral meniscus root tear depend on the state of the meniscofemoral ligament. [133] (10.1007/s00402-013-1716-7)
• [L3] A meniscectomy after meniscal repair is performed infrequently, supporting the notion that repairing a meniscus is a safe and effective procedure in the long term. [143] (10.1177/0363546513503444)
• [L4] [150] (10.1007/s00167-014-3467-6)
• [L2] Root centralization procedures can result in significant improvement in clinical scores and medial meniscal extrusion (MME), but the benefits appear dependent on the surgical technique. [151] (10.1302/0301-620x.107b11.bjj-2025-0018.r2)
• [L3] MRI is not always useful in predicting reparability of symptomatic isolated lateral semilunar meniscus tears, and most of the symptomatic cases with normal MRI were reparable. [153] (10.1007/s00167-002-0280-4)
• [L3] Persons with medial meniscus posterior root tear had significantly increased age, female sex predominance, higher BMI, increased Kellgren-Lawrence grade, greater varus mechanical axis angle, and lower sports activity level compared with persons with other types of meniscal tear. [162] (10.1177/0363546512447792)
• [L3] Confusion between meniscal fraying and small tears is a major source of discrepancy between MRI and surgical findings. [167] (10.1007/s00402-007-0318-7)
• [L5] Posterior horn radial tears adjacent to the medial meniscus root that extend to the meniscocapsular junction can lead to derangement of the loading profiles of the medial compartment that are similar to a root avulsion. [170] (10.1177/0363546513499314)
• [L3] Magnetic resonance imaging is not an effective or efficient predictor of reparability of meniscal tears with the current arthroscopic criteria. [172] (10.1177/0363546510387507)
• [L3] Medial root tear leads to significantly decreased dynamic medial displacement of the meniscus compared to healthy meniscus status. [176] (10.1007/s00167-018-5341-4)
• [L5] Meniscal extrusion greater than 3 mm is suggestive of combined posterior medial meniscal root and meniscotibial ligament lesions. [178] (10.1016/j.arthro.2023.01.104)
• [L5] The article illustrates that 2 years of follow-up is insufficient for meniscal repairs, as success rates can deteriorate significantly over longer periods, and suggests that a perspective considerably longer than 6.6 years is necessary to evaluate the ultimate goal of reducing degenerative arthritis. [179] (10.1177/0363546505279154)
• [L1] Meniscal repair is associated with a lower progression to knee osteoarthritis at approximately six years of followup compared to partial meniscectomy. [180] (10.1007/s00167-023-07600-y)
• [L4] The number of patients who perceived substantial clinical improvement 5 years after surgical repair of medial meniscal root tears was relatively small. [181] (10.1016/j.arthro.2025.04.058)
• [L3] Age of 40 years or older is not associated with an increased risk of meniscal repair failure at 5 years, although a shorter time to failure was noted in this age cohort. [182] (10.1016/j.arthro.2018.11.061)
• [L4] The long-term evaluation of the anterior cruciate ligament–reconstructed knees with concurrent successful meniscal repairs demonstrated a low rate of radiographic arthritis. [183] (10.1177/0363546510392014)
• [L5] The proposed method is conceptually straightforward, relatively inexpensive, and without undue surgical risk, but must still demonstrate it can be performed safely and effectively in an arthroscopic fashion and maintain meniscal root stability over time to be widely accepted. [184] (10.1016/j.arthro.2020.06.018)

See Also

• Knee osteoarthritis
• Partial meniscectomy
• Meniscal repair
• ACL reconstruction
• Meniscal tear
• Anatomy

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