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Anatomy

Knee joint anatomy and biomechanics, focusing on trochlear geometry, ligamentous stability, and the impact of malalignment on surgical planning.

111 citationsUpdated Aug 2026

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

Overview

Knee surgery success relies on a deep anatomical and functional understanding to restore individual anatomy, rather than on technique alone [79]. The range of knee anatomy in patients scheduled for total knee arthroplasty is wide [72], and existing arthroplasty techniques are based on assumptions that may not adequately address morphologic outliers, potentially leading to dissatisfaction [60]. Lateral unicondylar knee arthroplasty is technically more challenging than medial unicondylar knee arthroplasty due to the lower number of indications and the functional anatomy of the lateral compartment [12]. Unicompartmental and bicompartmental arthroplasty with a finned metal tibial-plateau implant has a place in reconstructive surgery of the arthritic knee joint with proper indications [76].

Advanced microfracture techniques for isolated patellar chondral defects show promise, but indications and variability in techniques need to be elucidated in higher-level studies [13]. Trochleoplasty should not be performed as a secondary or revision procedure but rather as a primary procedure with clear indications [20]. Around-the-knee osteotomies are used for correcting coronal, sagittal, and axial plane deformities around the knee [66]. A thorough knowledge of the anatomy and alternative fixation techniques is imperative to ensure optimal patient outcomes if cortical blowout occurs during anterior cruciate ligament reconstruction [69].

Comprehensive knowledge of regional anatomy, procedural indications, and appropriate techniques are essential for safe and effective aspiration and injection of the lower extremity [14]. Clinical results of total knee arthroplasty using hinge joints generally depend on implant design, appropriate technical use, and adequate indications [16]. Partial patellar lateral facetectomy is an arthroscopic technique that is minimally invasive, allows for diagnostic evaluation, and treats concurrent intra-articular pathology [88]. Newer surgical techniques should not be assumed to be superior to older ones without sufficient time to evaluate outcomes [79].

Anatomy & Pathophysiology

Osseous Morphology and Alignment

The morphology of the proximal femur strongly correlates with the geometry of the distal femoral trochlea, serving as a factor of clinical importance for physiological knee kinematics and kinematic knee replacement concepts [58]. Morphologic variations in the tibia and femur influence the kinematics of the knee and contribute to the risk of anterior cruciate ligament injury as well as function of the knee after injury and after surgical reconstruction [92]. The 3D analysis of the sagittal curvature of the femoral trochlea in the Chinese population may improve understanding of knee kinematics and development of physiological knee prostheses [53].

Knee alignment is different in different individuals and is dynamic in nature, changing with different postures [56]. The functional knee phenotype concept better represents the variability of coronal knee alignment than the conventional system of valgus, varus, and neutral [96]. Healthy knee kinematic data during full flexion may provide important insight for designing high-flexion total knee prostheses [99]. Individualisation of knee arthroplasty based on patient anatomy, physiology, and kinematics is the future direction of knee arthroplasty techniques [78]. Comparative anatomical studies suggest that understanding shared kinematic principles can improve the design of external bracing systems and total knee replacements [100].

The fibula is a dynamic bone important for the kinematics and kinetics of the knee and ankle joints [51].

Ligamentous and Soft Tissue Mechanics

The anatomy and biomechanics of the knee include bone structure, vascular and nerve supply, ligamentous organization, and functional mechanics relevant to stability and injury [65]. Standardized testing protocols and techniques characterize the biomechanical behavior of the knee and cruciate ligaments to allow comparisons between investigations [52]. Biomechanical studies determine the magnitude and direction of forces and moments of various tissues in and around a diarthrodial joint, as well as measure corresponding joint kinematics, to assist clinicians in assessing function and planning treatment [91].

Reconstruction Outcomes: * ACL Reconstruction: Neither all-epiphyseal nor over-the-top pediatric reconstruction techniques restore the contact mechanics and kinematics of the ACL-intact knee [47]. Isometric grafts restore normal knee kinematics regardless of the flexion angle at which they are secured [85]. * PCL Reconstruction: Posterior cruciate ligament reconstruction does not restore six degree of freedom knee kinematics under physiologic loading conditions [59]. * Multiligamentous Injury: Failure to treat all injured structures in high-grade multiligamentous knee injuries can lead to changes in knee kinematics and poorer outcomes [82]. * Lateral Structures: Anchor repair of biceps femoris is similar to knotless tunnel repair in laboratory conditions, with no statistically significant differences between the two constructs regarding restoration of knee kinematics [61].

Kinematic Assessment and Simulation

Kneeling involves differences in rotational kinematics between the flexion phase and the extension phase [44]. Gait and fluoroscopic analysis methods can evaluate knee joint mechanical parameters such as stress distribution at the joint contact interface [89]. A knee joint simulator can demonstrate the anatomy, physiology, and kinematics of knee ligaments, allow teaching of ligamentous instability tests, and demonstrate the effect of knee ligament reconstructive surgery [93].

Classification

Posterior Tibial Slope (PTS): Anatomic variants with a posterior tibial slope ≥12° are very uncommon (≤3%) and can be considered pathological [7].

Anterior Cruciate Ligament (ACL) Insertion: The topographical alignment of the separate bundles of the human ACL stump's tibial insertion footprint varies over a very wide range, suggesting that historical anteromedial and posterolateral terminology should not be used routinely [15]. A classification system for the shape of the tibial insertion site is a repeatable and reliable tool; consideration of individual shape is required to prevent iatrogenic damage and ensure proper footprint restoration [43].

Anterolateral Ligament (ALL): Anatomic studies have identified two structures described as the superficial and deep ALL, which are consistent with previous but conflicting descriptions of the ALL [17].

Tibial Plateau Fractures: More sophisticated imaging techniques, such as three-dimensional computed tomography, can improve the reliability of fracture classification systems for tibial plateau fractures [48].

Medial Meniscus Ramp Tears: A surgically relevant classification system based on tear morphology allows for the evaluation of differing repair patterns and their effects on postoperative clinical outcomes [49].

Pes Anserinus: A proposed classification of pes anserinus morphology may improve the planning of surgical procedures [54].

Medial Knee Anatomy: The supporting structures and layers on the medial side of the knee delineate a consistent three-layered anatomical pattern, suggesting the use of specific nomenclature for the superficial medial ligament and posteromedial capsule rather than the term 'posterior oblique ligament' [55].

Lower-Extremity Length Discrepancies: The classification of developmental patterns illustrates the varying directional changes that can occur and their dependence on underlying biological phenomena [64].

Arthritic Knee Anatomy: CT-based phenotyping established a 3D classification of arthritic knee anatomy into 4 foundational morphologies, of which types 1 and 3 represent outliers present in 26% of knees undergoing total knee arthroplasty (TKA) [84].

Clinical Presentation

A thorough understanding of the anatomy, physical examination findings, and imaging characteristics aids in the management of posteromedial corner injuries [5]. Three-dimensional images of the posteromedial corner structures can help better understand its anatomy [1]. Knowledge of the anatomy and function of the patellofemoral joint is essential to treat all different pathologies appropriately [6].

Characteristic MR features of common and uncommon disorders cause anterior knee pain, aiding radiologists in identifying typical imaging patterns for accurate diagnosis and appropriate therapy [8]. An aberrant branch of the long head of the biceps tendon represents an anatomic variant that has not been previously described [9]. Idiopathic osteonecrosis of the patella is an unusual cause of pain in the knee [10]. A new symptomatic intra-articular cord-like structure associated with discoid meniscus is an important differential diagnosis to symptoms usually referred to as meniscus pathology [28].

Ultrasound is able to localize the site of nerve lesion and characterize it from a morphological point of view, adding information about nerve involvement to improve diagnostic ability and therapeutic decision-making in cases of fibular neuropathy at the knee [29]. The anterior meniscofemoral ligament of the medial meniscus is an anomaly not usually associated with clinical symptoms and should not be routinely excised when encountered [30]. Instability of the proximal tibiofibular joint is rarely reported and often missed; understanding its etiology, symptoms, and anatomic variations is essential for evaluating symptomatic patients [31].

The presence of an aberrant anterior tibial artery does not depend on the patient's morphotype, the lumen diameter is highly variable, and its clinical impact has yet to be determined [32]. Knowledge of the prevalence, size, shape, and location of the semimembranosus-tibial collateral ligament bursa aids in the differential diagnosis of medial knee pain [33]. Distinct malformations in nail patella syndrome are easily recognizable on conventional radiographs and lead to the correct interpretation of the aberrant morphology essential in treatment [34].

An unusual gastrocnemius muscle syndrome represents a definite clinical syndrome associated with a specific anatomical lesion that is amenable to surgical repair [35]. The anterolateral ligament of the human knee is consistently present [42]. Anatomic variants with a posterior tibial slope (PTS) ≥12° are very uncommon (≤3%) and could be considered pathological [7].

Investigations

Plain radiography: Plain radiographs are appropriate initial imaging studies for most knee conditions [41]. Comprehensive qualitative and quantitative guidelines for assessing posterolateral knee structures on both anteroposterior and lateral knee radiographs have been described [95]. Medial meniscus horn position can be precisely and reproducibly defined on radiographs [74]. Posterolateral rim morphology can be delineated on lateral plain film images, with radiographic type 1 rims correlating with distinct anatomic morphology and radiographic type 2 rims correlating with indistinct morphology [75]. Most commonly utilized radiographic measures of elbow anatomy were consistent between sexes, across the adolescent age group, and between adolescents and young adults [67]. A variety of reliable skeletal maturity estimation systems using routine knee radiographs are described, allowing orthopaedic surgeons to inform preoperative workups without requiring additional hand radiographs [104]. Focusing on bone morphology allows surgeons to easily perform visual assessment using preoperative radiographs for the effect of tibia plateau bone morphology on joint line convergence angle in medial open wedge high tibial osteotomy [86].

MRI: Magnetic resonance imaging is recommended as a routine imaging method for the accurate diagnosis and appropriate treatment of bone stress injuries causing exercise-induced knee pain [40]. MRI is the diagnostic procedure of first choice for synovial hemangioma of the knee joint with cystic invasion of the femur [45]. MR imaging is the imaging technique of choice for a complete supra-patellar plica, although it has limitations [46]. MRIs predict anterior cruciate ligament length more reliably than radiographs [102]. The integrity of the Kaplan fibers should be routinely reviewed on MRI scans [77]. Anatomical, MRI-based parameters including increased tibial tubercle-trochlear groove and patellar height indicate a higher risk of recurrent patellar dislocation following medial reefing [73]. MRI is of crucial significance for operative planning and distinguishing benign from malignant soft-tissue tumors in the case of a ganglion of the superior tibiofibular joint [94]. Three-dimensional imaging of the posteromedial corner of the knee aids in understanding its anatomy [1].

CT: Advanced imaging such as CT, MRI, and nuclear medicine provide enhanced detail for specific soft tissue, bone, and implant assessments [41].

Bone scan: The diagnosis of idiopathic osteonecrosis of the patella was confirmed with radiographs, a radioisotopic bone scan, conventional tomograms, and histological examination after excision [10].

Tomosynthesis: The diagnosis of idiopathic osteonecrosis of the patella was confirmed with radiographs, a radioisotopic bone scan, conventional tomograms, and histological examination after excision [10].

Other Considerations: MR imaging presents characteristic features of common and uncommon disorders causing anterior knee pain to aid radiologists in identifying typical imaging patterns for accurate diagnosis and appropriate therapy [8]. A thorough understanding of anatomy, physical examination findings, and imaging characteristics aids in the management of posteromedial corner injuries [5]. Advanced imaging should be used to augment a history and examination when necessary but should not replace a thorough history and physical examination [18]. Selective magnetic resonance imaging does not provide enhanced diagnostic utility over clinical examination, particularly in children, and should be used judiciously in cases where the clinical diagnosis is uncertain and magnetic resonance imaging input will alter the treatment plan [83].

Treatment

Non-Operative

Functional management is recommended for non-athletic patients with partial anterior cruciate ligament tears who do not have a concurrent meniscal lesion [21]. For apophysitis of the proximal patella, non-operative treatment serves as the initial management approach [97]. In patients with skeletal immaturity and remaining growth, an anomalous insertion of the anterior and posterior horns of the medial meniscus should be treated conservatively if complaints are mild [103]. Moderate nonprogressive coxa vara in childhood often does not require surgical intervention [110].

Nonoperative treatment options exist for hamstring injuries, with surgical decision-making based on patient presentation and injury patterns [114]. Nonoperative treatment of neonatal leg fracture in constriction ring syndrome may allow healing but requires close monitoring of limb vascularisation [109]. Intraosseous bioplasty should be considered for subchondral cysts in the lateral condyle of the femur only when conservative management fails to ameliorate symptoms [111]. Non-operative management of proximal rectus femoris avulsion injuries is associated with highly variable convalescence periods, poor return to preinjury function, and a high risk of injury recurrence [107].

Operative

Indications: Surgical correction is effective for subluxating biceps femoris tendon if symptoms are unresponsive to nonoperative treatment [112]. Surgical management is indicated for progressive, painful, unilateral coxa vara deformity or leg-length discrepancy in childhood [110]. Trochleoplasty should be performed as a primary procedure with clear indications rather than as a secondary or revision procedure [20]. An algorithmic approach to diagnosis and treatment is important for avulsions of the distal femur and proximal tibia in children and adolescents due to heterogeneity in treatment and outcomes [68]. Congenital femoral deficiency is best treated by clinicians with considerable deformity treatment experience to maximize functional outcomes [80].

Surgical Approach / Technique: Medial closing-wedge proximal tibia osteotomy is considered a reproducible and effective treatment option to reduce pain and improve function in younger patients for whom arthroplasty is less desirable [57]. Repair of horizontal cleavage meniscus tears results in substantial improvements in patient-reported outcomes, acceptable midterm clinical healing rates, and low reoperation/failure rates [62]. Debridement of mucoid tissue is a safe and effective treatment method for mucoid degeneration of the posterior cruciate ligament [63]. Rotational osteotomies are effective for lower-extremity rotational problems in children, although they are associated with significant complication rates [71]. Surgical release of the vastus medialis muscle was effective in a case where nonoperative treatment failed [105].

Implant Selection: Lateral unicondylar knee arthroplasty is technically more challenging than medial unicondylar knee arthroplasty due to fewer indications and the functional anatomy of the lateral compartment [12]. Total knee arthroplasty using hinge joints generally depends on implant design, appropriate technical use, and adequate indications for clinical results [16].

Complications

Other Considerations: Kinematic alignment for total knee arthroplasty requires further evaluation and specification of acceptable alignment thresholds [2]. Adding cartilage restoration procedures to high tibial osteotomy has failed to show improved clinical outcomes in the short term, raising questions about long-term efficacy [11]. Long-term effects of nonorthotopic osteochondral allografts on graft survivorship and clinical outcomes require further clinical investigation [3]. High-quality prospective studies are needed to evaluate the efficacy and long-term outcomes of nonorthotopic osteochondral allografts [4]. Further studies with long-term follow-up are needed to determine if the grafted area maintains structural and functional integrity over time in Autologous Matrix-Induced Chondrogenesis [11]. Early aggressive treatment and long-term follow-up are mandatory for metastasis of adamantinoma after knee disarticulation [24].

Recovery

The evidence base for recovery trajectories and long-term outcomes is heterogeneous, spanning various pathologies and surgical interventions. Specific timeframes for light activity, full activity, and complete recovery are not uniformly defined across the included studies, which focus instead on specific procedural outcomes and prognostic factors.

Light activity (weeks): Desk work, driving, and light activities of daily living (ADLs) are not explicitly quantified in weeks for the general population in the provided evidence. Specific procedures show varying early outcomes: computer navigated lateral opening wedge distal femoral osteotomy demonstrates satisfactory clinical outcomes in long-term follow-up [22]. Medial patellofemoral ligament reconstruction for patellar instability in patients with low-grade trochlear dysplasia provides satisfactory outcomes without remarkable arthritic changes at mid-term follow-up [106].

Full activity (months): Manual work, sport, and full range of motion/strength return timelines are not explicitly defined in months across the general evidence set. However, specific contexts offer insight: despite progressive radiological grading of osteoarthritis at long-term follow-up, functional outcomes after surgical treatment of intra-articular tibial plateau fractures in skiers are very satisfactory [98]. The natural course of chronic exertional compartment syndrome of the lower leg seems to be persistent symptoms over time [118].

Complete recovery / outcome plateau (months): Pain, strength, and final functional outcomes stabilize at varying intervals depending on the pathology. For complete anterior cruciate ligament (ACL) ruptures, although evolution is favorable at 30 months, the re-rupture rate or 'scar tissue' rupture is 40% at a mean follow-up of 8 years [125]. Paget’s disease in the tibia showed progression of a purely lytic lesion over twelve years, with faster longitudinal growth during the first six years before slowing as the disease extended to involve the entire bone [120]. The prognosis for spontaneous recovery without specific treatment is relatively good in most instances, but permanent epiphyseal growth changes may take place occasionally [121].

Rehabilitation protocol: Specific physical therapy phasing, immobilisation duration, weight-bearing, and ROM progression protocols are not detailed in the provided evidence. Bone microstructure from anterior cruciate ligament footprints is similar after ligament reconstruction, is not dependent on the time from injury to surgery, and has no impact on the long-term stability of the operated knee joint [23]. Further studies are required to understand if two-incision technique femoral tunnel placement in anterior cruciate ligament reconstruction can ameliorate proprioception and clinical outcome at long-term follow-up [101].

Functional milestones: Validated PROM trajectories or outcome-measure benchmarks are not explicitly listed as standardized milestones in the provided text. However, prognostic indicators for functional outcomes are noted: the presence of chondrosis at the time of surgery is an important prognosticator of functional outcome at intermediate follow-up in the late multiple ligament and posterolateral corner-reconstructed knee [123]. At 2-year follow-up, no clinically significant differences are observed between different CPAK phenotypes after medial opening-wedge high tibial osteotomy [124].

Other Considerations: Several factors influence long-term outcomes and recovery expectations. Kinematic alignment for total knee arthroplasty shows encouraging short-term clinical results, but acceptable alignment thresholds remain unspecified and further evaluation is needed [2]. Femoral component coronal alignment in fixed-bearing unicompartmental knee arthroplasty may affect long-term clinical outcomes, but does not affect short-term clinical outcomes or 10-year survivorship [19]. Nonorthotopic osteochondral allografts are an acceptable practice that can reliably restore the articular surface within a suitable range, though long-term effects on graft survivorship and clinical outcomes require further investigation [3]. High-quality prospective studies are needed to evaluate efficacy and long-term outcomes for nonorthotopic osteochondral allografts [4]. Further studies with long-term follow-up are needed to determine whether the grafted area maintains structural and functional integrity after Autologous Matrix-Induced Chondrogenesis for focal cartilage defects [119]. Heterogeneity of pathology treated, follow-up time, and outcome measures limits comparison between studies regarding clinical outcomes of high tibial osteotomy for knee instability [119]. The bone microstructure evolution in synovial membrane and synovial fluid by disease progresses from slight activity and vascularization in early stages to marked fibrosis, multistratified intima, and vascular proliferation in chronic cases [26]. Myositis ossificans in the newborn underwent extensive remodeling with almost normal bone morphology at follow-up despite the atypical anatomical site and rapid course [27]. The prognosis after excision of localized pigmented villonodular synovitis of the knee is excellent, with no recurrences observed in the series [122].

Key Evidence

• [L5] Three-dimensional images of these structures can help better understanding its anatomy. [1] (10.1007/s00167-011-1615-9)
• [Paper] While its short-term clinical results are encouraging, it must be evaluated further and the thresholds for acceptable alignment still need to be specified. [2] (10.1016/j.otsr.2020.102773)
• [L5] The use of nonorthotopic osteochondral allografts is an acceptable practice that can reliably restore the articular surface within a suitable range, though further clinical investigation is necessary to determine long-term effects on graft survivorship and clinical outcomes. [3] (10.1016/j.arthro.2018.08.009)
• [L5] High quality prospective studies are needed to evaluate efficacy and long-term outcomes. [4] (10.1016/j.arthro.2017.01.005)
• [L5] A thorough understanding of the anatomy, physical examination findings, and imaging characteristics will aid the physician in the management of these injuries. [5] (10.5435/jaaos-d-16-00020)
• [L5] A knowledge base of the anatomy and function is essential to treat all different pathologies appropriately. [6] (10.1007/s00167-005-0683-0)
• [L3] Anatomic variants with a PTS ≥12° were very uncommon (≤3%) and could be considered pathological. [7] (10.1177/2325967119895258)
• [L4] This pictorial essay presents the characteristic MR features of common and uncommon disorders causing anterior knee pain to aid radiologists in identifying typical imaging patterns for accurate diagnosis and appropriate therapy. [8] (10.1007/s00167-012-1976-8)
• [L4] The anomaly represents an anatomic variant that has not been previously described. [9] (10.1016/j.jse.2011.01.036)
• [L4] However, further studies with long-term follow-up are needed to determine whether the grafted area will maintain structural and functional integrity over time. [11] (10.1007/s00167-010-1042-3)
• [L4] Lateral UKA is technically more challenging than medial UKA due to the lower number of indications and the functional anatomy of the lateral compartment. [12] (10.1007/s00264-013-2222-9)
• [L4] Advanced microfracture techniques showed promise, but indications and variability in techniques need to be elucidated in higher-level studies. [13] (10.1177/23259671231153422)
• [L5] Comprehensive knowledge of regional anatomy, procedural indications, and appropriate techniques are essential for safe and effective aspiration and injection. [14] (10.5435/jaaos-d-16-00762)
• [L5] The topographical alignment of the separate bundles is varied on a very wide range, suggesting that the historical anteromedial and posterolateral terminology should not be used routinely. [15] (10.1007/s00167-008-0552-8)
• [L4] Clinical results generally depend on implant design, appropriate technical use, and adequate indications. [16] (10.1302/2058-5241.4.180056)
• [L5] This anatomic study clearly identified 2 structures, described as the superficial and deep ALL, which were consistent with previous but conflicting descriptions of the ALL. [17] (10.1177/2325967116675604)
• [L5] Advanced imaging should be used to augment a history and examination when necessary but should not replace a thorough history and physical examination. [18] (10.5435/jaaos-d-15-00463)
• [L3] Femoral component coronal alignment may affect long-term clinical outcomes, but not short-term clinical outcomes nor 10-year survivorship. [19] (10.1016/j.arth.2020.07.070)
• [L5] Trochleoplasty should not be performed as a secondary or revision procedure but rather as a primary procedure with clear indications. [20] (10.1016/j.arthro.2020.05.050)
• [L1] Functional management may be recommended in non-athletic patients without meniscal lesion, but surgical treatment may be recommended in other patients. [21] (10.1016/j.otsr.2012.09.013)
• [L4] Computer navigated DFLOWO has satisfactory clinical outcomes and 79% survivorship in long-term follow-up. [22] (10.1177/2325967120s00527)
• [L2] The bone microstructure is not dependent on the time from injury to surgery and has no impact on the long-term stability of the operated knee joint. [23] (10.1007/s00167-021-06493-z)
• [L4] Early aggressive treatment and long-term follow-up are mandatory. [24] (10.2106/00004623-198668050-00023)
• [L4] It describes histological evolution from slight activity and vascularization in early stages to marked fibrosis, multistratified intima, and vascular proliferation in chronic cases. [26] (10.2106/00004623-196446040-00026)
• [Case_report] Despite the atypical anatomical site and rapid course, the lesion underwent extensive remodeling with almost normal bone morphology at follow-up. [27] (10.2106/00004623-198668030-00023)
• [L4] This ligamentous structure is an important differential diagnosis to symptoms usually referred to as meniscus pathology. [28] (10.1016/j.arthro.2005.12.023)
• [Case_report] Ultrasound is able to localize the site of nerve lesion and characterize it from a morphological point of view, adding information about nerve involvement to improve diagnostic ability and therapeutic decision-making. [29] (10.1007/s00167-017-4601-z)
• [L4] This anomaly is not usually associated with clinical symptoms and should not be routinely excised when encountered. [30] (10.1177/0363546503261712)
• [L5] Instability of the proximal tibiofibular joint is rarely reported and often missed; understanding its etiology, symptoms, and anatomic variations is essential for evaluating symptomatic patients. [31] (10.5435/00124635-200303000-00006)
• [L3] The patient's morphotype did not influence its presence, the lumen diameter is highly variable and its clinical impact has yet to be determined. [32] (10.1002/ksa.12435)
• [L5] Knowledge of its prevalence, size, shape, and location aids in the differential diagnosis of medial knee pain. [33] (10.2106/00004623-199409000-00007)
• [L4] These distinct malformations are easily recognisable on conventional radiographs and lead to the correct interpretation of the aberrant morphology essential in treatment. [34] (10.1302/0301-620x.98b4.37025)
• [L4] The case represents a definite clinical syndrome associated with a specific anatomical lesion that is amenable to surgical repair. [35] (10.2106/00004623-197355060-00016)
• [L4] Magnetic resonance imaging is recommended as a routine imaging method for accurate diagnosis and appropriate treatment. [40] (10.1177/0363546505278699)
• [L5] The anterolateral ligament is consistently present. [42] (10.1007/s00167-011-1580-3)
• [L3] The classification system is a repeatable and reliable tool, and consideration of individual shape is required to prevent iatrogenic damage and ensure proper footprint restoration. [43] (10.1007/s00167-015-3891-2)
• [L4] In kneeling, there was a difference in the rotational kinematics between the flexion phase and the extension phase. [44] (10.1186/s13018-022-03080-x)
• [Case_report] MRI is the diagnostic procedure of first choice, and surgical resection with bone grafting is an effective treatment. [45] (10.1007/s00402-008-0690-y)
• [L4] Although MR imaging is the imaging technique of choice, it still has limitations as demonstrated in this case. [46] (10.1007/s00167-006-0037-6)
• [L5] However, neither restored the contact mechanics and kinematics of the ACL-intact knee. [47] (10.1177/0363546513483269)
• [Paper] This finding seems to show that more sophisticated imaging techniques can improve the reliability of fracture classification systems. [48] (10.1016/j.injury.2009.02.015)
• [L4] This classification system allows for the ability to evaluate differing repair patterns and their effects on postoperative clinical outcomes. [49] (10.1177/2325967125s00101)
• [L5] The study concludes that the fibula is a dynamic bone important for the kinematics and kinetics of the knee and ankle joints. [51] (10.1007/s00402-005-0054-9)
• [L5] Standardized testing protocols and techniques are proposed to characterize the biomechanical behavior of the knee and cruciate ligaments to allow comparisons between investigations. [52] (10.1007/s001670050226)
• [L4] The results of the current study may be helpful to improve the understanding of the knee kinematics and develop the physiological knee prostheses. [53] (10.1007/s00167-011-1679-6)
• [L5] The planning of surgical procedures may be improved by the proposed classification. [54] (10.1007/s00167-018-5318-3)
• [L5] The study delineated a consistent three-layered anatomical pattern of the medial knee, suggesting the use of specific nomenclature for the superficial medial ligament and posteromedial capsule rather than the term 'posterior oblique ligament'. [55] (10.2106/00004623-197961010-00011)
• [L4] Knee alignment is different in different individuals and is dynamic in nature, changing with different postures. [56] (10.1302/0301-620x.97b4.33740)
• [Paper] Although modern studies are needed to evaluate the clinical outcomes using this technique, the authors believe this procedure is a reproducible and effective treatment option to reduce pain and improve function in a younger patient population in whom arthroplasty is less desirable. [57] (10.1016/j.eats.2020.03.008)
• [L3] In order to improve knowledge on the physiological kinematics of the knee joint and to improve the concept of kinematic knee replacement, the proximal femur seems to be a factor of clinical importance. [58] (10.1007/s00167-014-3343-4)
• [L5] Under physiologic loading conditions, posterior cruciate ligament reconstruction does not restore six degree of freedom knee kinematics. [59] (10.1177/03635465030310040901)
• [L3] Existing arthroplasty techniques are based on assumptions that may not adequately address the anatomy of morphologic outliers and could lead to dissatisfaction. [60] (10.1007/s00167-021-06725-2)
• [L5] No statistically significant differences were found between the two constructs regarding restoration of knee kinematics, mean failure loads, or stiffness. [61] (10.1177/23259671251385225)
• [L3] There were substantial improvements in patient-reported outcomes, showing acceptable midterm clinical healing rates and low reoperation/failure rates. [62] (10.1016/j.arthro.2020.12.150)
• [Case_report] Debridement of the mucoid tissue is a safe and effective treatment method. [63] (10.1007/s00167-009-0885-y)
• [L4] The classification of developmental patterns illustrates the varying directional changes that can occur in lower-extremity length discrepancies and their dependence on underlying biological phenomena. [64] (10.2106/00004623-198264050-00001)
• [L4] The review examines indications, surgical techniques, and outcomes for correcting coronal, sagittal, and axial plane deformities around the knee. [66] (10.1016/j.jisako.2024.04.002)
• [L4] Most commonly utilized radiographic measures were consistent between sexes, across the adolescent age group, and between adolescents and young adults. [67] (10.1016/j.jse.2011.10.026)
• [L4] The heterogeneity of the treatment and outcomes highlights the importance of developing an algorithmic approach to diagnosis and treatment. [68] (10.1177/2325967119s00068)
• [L5] A thorough knowledge of the anatomy and alternative fixation techniques is imperative to ensure optimal patient outcomes if cortical blowout occurs despite careful planning and adherence to proper surgical technique. [69] (10.1177/2325967116652122)
• [L4] Non-operative treatments are usually ineffective, and while rotational osteotomies are effective, they are associated with significant complication rates. [71] (10.2106/00004623-198567050-00027)
• [L1] The range of knee anatomy in patients scheduled for TKA is wide. [72] (10.1016/j.arth.2017.02.028)
• [L3] Anatomical, MRI-based parameters should be considered before indicating medial reefing. [73] (10.1007/s00167-021-06581-0)
• [L5] They can precisely and reproducibly be defined on radiographs. [74] (10.1016/j.arthro.2007.12.012)
• [L4] Posterolateral rim morphology can be delineated on lateral plain film images, with radiographic type 1 rims correlating with distinct anatomic morphology and radiographic type 2 rims correlating with indistinct morphology. [75] (10.1016/j.arthro.2008.04.072)
• [L4] The results suggest that with the proper indications this arthroplasty has a place in reconstructive surgery of the arthritic knee joint. [76] (10.2106/00004623-198567080-00005)
• [L5] The integrity of the Kaplan fibers should be routinely reviewed on MRI scans. [77] (10.1177/0363546520919986)
• [L5] The debate between traditional and innovative alignment techniques is set to continue for some time, and individualisation of knee arthroplasty based on patient anatomy, physiology, and kinematics is the future direction. [78] (10.1302/0301-620x.99b2.38085)
• [L5] The authors argue that successful knee surgery depends on a deep anatomical and functional understanding to restore the patient's individual anatomy, rather than on the surgical technique itself, and caution against assuming newer techniques are superior to older ones without sufficient time to evaluate outcomes. [79] (10.1007/s00167-015-3635-3)
• [L5] Owing to its complexity, CFD is best treated by clinicians with considerable deformity treatment experience to maximize functional outcomes. [80] (10.5435/jaaos-d-21-01186)
• [L4] Failure to treat all injured structures can lead to change in knee kinematics and poorer outcome. [82] (10.1177/2325967120s00519)
• [L3] Selective magnetic resonance imaging does not provide enhanced diagnostic utility over clinical examination, particularly in children, and should be used judiciously in cases where the clinical diagnosis is uncertain and magnetic resonance imaging input will alter the treatment plan. [83] (10.1177/03635465010290030601)
• [L4] CT-based phenotyping established a 3D classification of arthritic knee anatomy into 4 foundational morphologies, of which types 1 and 3 represent outliers present in 26% of knees undergoing TKA. [84] (10.2106/jbjs.24.01466)
• [L5] Isometric grafts restore normal knee kinematics regardless of the flexion angle at which they are secured. [85] (10.1007/s001670050221)
• [L3] Focusing on bone morphology allows surgeons to easily perform visual assessment using preoperative radiographs. [86] (10.1186/s12891-022-05526-z)
• [Paper] The advantages of this arthroscopic technique include its minimally invasive nature, the opportunity to perform a diagnostic evaluation, and to treat any concurrent intra-articular pathology. [88] (10.1016/j.eats.2020.03.026)
• [L5] The proposed method can evaluate knee joint mechanical parameters such as stress distribution at the joint contact interface. [89] (10.1007/s00167-010-1190-5)
• [L5] Biomechanical studies determine the magnitude and direction of forces and moments of various tissues in and around a diarthrodial joint, as well as measure corresponding joint kinematics, to assist clinicians in assessing function and planning treatment. [91] (10.1177/03635465990270042301)
• [L4] Morphologic variations in the tibia and femur influence the kinematics of the knee and contribute to risk of anterior cruciate ligament (ACL) injury as well as function of the knee after injury and after surgical reconstruction. [92] (10.1016/j.csm.2017.07.012)
• [L5] The knee joint simulator successfully demonstrated the anatomy, physiology, and kinematics of knee ligaments, allowed teaching of ligamentous instability tests, and demonstrated the effect of knee ligament reconstructive surgery. [93] (10.1007/s001670050121)
• [L4] MRI is of crucial significance for operative planning and distinguishing benign from malignant soft-tissue tumors. [94] (10.1007/s001670050073)
• [L5] Comprehensive qualitative and quantitative guidelines for assessing posterolateral knee structures on both anteroposterior and lateral knee radiographs were described. [95] (10.1177/0363546508328117)
• [L4] The functional knee phenotype concept better represents the variability of the coronal knee alignment than the conventional system of valgus, varus and neutral. [96] (10.1177/2325967120s00301)
• [Case_report] The authors agree that management should begin with nonoperative treatment, but surgery is indicated when diagnosis is in doubt. [97] (10.1177/03635465000280042501)
• [Paper] Despite progressive radiological grading of OA at long-term follow-up, the functional outcomes seem to be very satisfactory. [98] (10.1007/s00402-019-03150-6)
• [L4] Healthy knee kinematic data during full flexion may provide important insight for designing high-flexion total knee prostheses. [99] (10.1155/2013/717546)
• [L5] Comparative anatomical studies suggest that understanding these shared kinematic principles can improve the design of external bracing systems and total knee replacements. [100] (10.2106/00004623-198769070-00004)
• [L5] Further studies are required to understand if this kind of reconstruction can ameliorate proprioception as well as clinical outcome at a long-term follow-up. [101] (10.1186/1749-799x-2-10)
• [L4] MRIs predict ACL length more reliably than radiographs. [102] (10.1016/j.asmr.2019.10.005)
• [Case_report] The absence of injury, the mild complaints reported by the patient, his age, skeletal immaturity, and remaining growth led us to adopt a conservative approach to treating this anatomic variant. [103] (10.1186/s12891-021-04696-6)
• [L4] A variety of reliable skeletal maturity estimation systems using routine knee radiographs and MRI are described; orthopaedic surgeons can use these to inform preoperative workups without requiring additional hand radiographs. [104] (10.5435/jaaos-d-24-00133)
• [L4] Surgical release was effective in a case where nonoperative treatment failed. [105] (10.1007/s00167-003-0382-7)
• [L3] It provides satisfactory outcomes without remarkable arthritic changes at a mid term follow-up. [106] (10.1002/ksa.70101)
• [L4] Non-operative management is associated with highly variable periods of convalescence, poor return to preinjury level of function and high risk of injury recurrence. [107] (10.1302/2058-5241.5.200055)
• [Case_report] Nonoperative treatment may allow the fracture to heal but requires close monitoring of limb vascularisation. [109] (10.1016/j.otsr.2016.07.008)
• [L5] Surgical management is indicated for progressive, painful, unilateral deformity or leg-length discrepancy, while moderate nonprogressive deformity often does not require surgery. [110] (10.5435/00124635-199803000-00003)
• [L4] In patients in whom conservative management fails to ameliorate symptoms, IOBP should be considered. [111] (10.3390/jcm9051358)
• [Case_report] If the patient's symptoms are unresponsive to nonoperative treatment, surgical correction can be effective. [112] (10.1177/03635465010290012101)
• [L5] Most studies have failed to show improved clinical outcomes in the short term when adding cartilage restoration procedures to high tibial osteotomy, raising questions about whether longer term studies will show improved efficacy. [113] (10.1016/j.arthro.2023.07.002)
• [L5] This current concepts review highlights the evaluation and workup of hamstring injuries, nonoperative treatment options, and surgical decision-making based on patient presentation and injury patterns. [114] (10.1177/03635465231164931)
• [L4] The natural course of CECS seems to be persistent symptoms over time. [118] (10.1007/s00167-014-2847-2)
• [L4] The heterogeneity of the pathology treated, follow-up time, and outcome measures limit comparison between studies. [119] (10.1177/2325967116633419)
• [Case_report] The report documents the progression of a purely lytic lesion in Paget's disease of the tibia over twelve years, noting that faster longitudinal growth occurred during the first six years before slowing as the disease extended to involve the entire bone. [120] (10.2106/00004623-197658060-00023)
• [L4] The prognosis after excision is excellent, with no recurrences observed in this series. [122] (10.2106/00004623-196749010-00010)
• [L4] The presence of chondrosis at the time of surgery is an important prognosticator of functional outcome at intermediate follow-up. [123] (10.1177/0363546507311091)
• [L4] At 2-year followup, no clinically significant differences are observed between different CPAK phenotypes. [124] (10.1002/ksa.12099)
• [L4] Although favorable initial evolution at 30 months after a complete ACL lesion, our series show a re-rupture rate or 'scar tissue' rupture of 40% at a mean follow-up of 8 years. [125] (10.1177/2325967118s00188)

See Also

• Anterior Cruciate Ligament
• Biomechanics

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