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Capsular release

Surgeon-side topic for capsular release. Backed by 415 articles from the corpus, retrieved via combined MeSH + title-text matching.

77 citationsUpdated Oct 2026

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Overview

Arthroscopic capsular release is a reliable surgical intervention for restoring shoulder motion with minimal morbidity in carefully selected patients [1]. It demonstrates high success rates and equal efficacy across five identified etiologic groups [2, 7]. The procedure provides significant pain relief, restoration of motion, and functional improvement within an average of three months [2]. Patients experience almost immediate short-term relief of pain and symptoms [5], along with dramatic improvements in range of motion that have not been observed with injections or physiotherapy [5]. In idiopathic adhesive capsulitis, significant reductions in pain, improvements in range of motion, and enhancements in overall shoulder function occur within the first postoperative week [12].

Indications typically arise after nine to twelve months of failed nonsurgical management for adhesive capsulitis [15]. While conservative treatment remains the primary choice for shoulder stiffness [13], arthroscopic capsular release is preferred over manipulation under anesthesia due to the risks associated with manipulation [13]. It is indicated for refractory cases of shoulder stiffness [13] and leads to faster, long-lasting recovery in patients with refractory primary frozen shoulder syndrome [10]. For shoulder stiffness concomitant with rotator cuff repair, both manipulation and capsular release with manipulation produce satisfactory functional outcomes and significantly improved range of motion [17]. However, most shoulders with early motion loss after rotator cuff repair recover motion and rarely require capsular release [3]. Initial management of posterior capsular contracture should remain nonsurgical, emphasizing range-of-motion stretching [4].

Long-term outcomes are favorable, with confirmed results in 255 patients with frozen shoulder [19] and favorable outcomes at mean 24 months follow-up for adhesive capsulitis [9]. The procedure can restore relatively normal function and health-related quality of life in most patients with shoulder contracture within six months of surgery [30]. It is considered a very cost-effective procedure [30]. Circumferential capsular release improves range of motion in shoulder pathologies, particularly where no bony deformities exist [16], as each segment of the joint capsule affects range of motion in all directions [14]. Post-surgery, range of motion was significantly greater on the affected side than on the unaffected side [14]. Stepwise rehabilitation is mandatory after the procedure [13]. While data demonstrate little benefit for capsular release instead of, or in addition to, manipulation under anesthesia for adhesive capsulitis [11], and the addition of posterior capsular release did not improve function over anterior release alone at six months in recalcitrant cases [18], more than 50% of patients experienced persistent pain and motion limitations at six-month follow-up [9]. Isolated arthroscopic debridement and capsular release may not provide substantial benefit to justify its use in most patients with glenohumeral arthritis [8].

Anatomy & Pathophysiology

Glenohumeral Joint Anatomy

The glenohumeral joint is a ball-and-socket articulation where the large humeral head articulates against, but not within, the small glenoid cavity [68]. The glenoid is a convex structure of shallow depth shaped like an inverted pear that articulates with the humeral head and serves as the attachment for the labrum and joint capsule [56]. The subchondral bone of the glenoid is relatively flat, with articular concavity augmented by cartilage and a circumferential labrum [59]. The glenoid averages 5° of retroversion in relation to the axis of the scapular body [59]. The fibrocartilaginous glenoid labrum deepens the socket by 50% and provides a bumper to translation [70]. The glenoid articular surface and labrum combine to create a socket approximately 9 mm deep in the superoinferior direction and 5 mm deep in the anteroposterior direction [69].

The humeral head is spherical with a diameter of 37 to 57 mm [56]. The most superior portion of the articular surface of the humeral head averages 8 mm above the greater tuberosity [56]. The humeral version averages 29.8 degrees, with a range of 10 to 55 degrees [56]. The humeral head is inclined approximately 130 degrees with respect to the humeral shaft [56]. The bicipital groove lies between the greater and lesser tuberosities and serves as a pathway for the long head of the biceps tendon [56].

The rotator cuff consists of the subscapularis, supraspinatus, infraspinatus, and teres minor muscles [57]. The subscapularis inserts on the lesser tuberosity and causes medial displacement of fracture fragments [56]. The supraspinatus and infraspinatus insert on the greater tuberosity and cause superior and posterior displacement of fracture fragments [56]. The pectoralis major inserts on the humeral shaft and displaces it medially [56].

The proximal humerus receives its blood supply from the anterior and posterior humeral circumflex branches from the third division of the axillary artery [56]. The posterior humeral circumflex artery travels with the axillary nerve, enters the quadrilateral space posteriorly, and anastomoses with a branch of the anterior circumflex to supply the posterior cuff [56]. The anterior humeral circumflex artery arises from the axillary artery at the inferior border of the subscapularis and provides vascular inflow to the humeral head via its terminal anterolateral branch, the artery of Laing [56]. The ascending branch of the anterior humeral circumflex artery courses parallel to the lateral aspect of the long head biceps tendon and enters the humeral head at the interface of the bicipital groove and greater tuberosity [56].

The axillary nerve is a terminal branch of the posterior cord of the brachial plexus that passes beneath the conjoined tendon anterior to the subscapularis 3 to 5 mm medial to the musculotendinous junction [62]. The axillary nerve is adjacent to the inferior capsule before entering the quadrilateral space posteriorly [62]. The axillary nerve splits into anterior and posterior branches within the quadrangular space [62]. The anterior and middle deltoid muscle receives sole innervation from the anterior branch of the axillary nerve [62]. The posterior deltoid muscle innervation varies, with supply from both branches in 89.1% of cases [62]. The posterior branch of the axillary nerve supplies the teres minor muscle and terminates as the superior lateral brachial cutaneous nerve [62].

Capsuloligamentous Complex

The glenohumeral joint capsule extends from the glenoid rim, progressing laterally toward the surgical neck of the humerus and blending with the tendons of the rotator cuff musculature [63]. Static stability of the glenohumeral joint is maintained by capsulolabral attachments and intracapsular ligamentous thickenings, while dynamic stability is afforded by the rotator cuff and periscapular musculature [63]. The rotator interval is defined medially by the base of the coracoid, superiorly by the supraspinatus tendon, and inferiorly by the subscapularis tendon [59]. The rotator interval contains the coracohumeral ligament, the superior glenohumeral ligament, and the intra-articular portion of the long head of the biceps tendon [59]. Laxity of the rotator interval results in inferior laxity, while contracture of the interval is seen with adhesive capsulitis [59].

The coracohumeral ligament restricts external rotation in adduction and is a static restraint to inferior and posterior translation in adduction and external rotation [59]. The superior glenohumeral ligament is a primary static restraint against anterior translation with the arm at the side [59]. The superior glenohumeral ligament, along with the coracohumeral ligament, forms a pulley that provides restraint against medial subluxation of the long head of the biceps tendon [59]. The middle glenohumeral ligament is a primary static restraint against anterior translation with the arm in external rotation and 45° of abduction [59]. The anterior band of the inferior glenohumeral ligament is a primary static restraint against anterior-inferior dislocation of the glenohumeral joint in 90° of abduction and external rotation [59]. The posterior band of the inferior glenohumeral ligament is a primary static restraint against posterior-inferior translation in internal rotation and adduction [59].

The inferior glenohumeral ligament is composed of a thick anterior band, a less thick and distinct posterior band, and a thinner intervening axillary pouch that creates a hammock-type sling [69]. With external rotation, the inferior glenohumeral ligament hammock slides anteriorly and superiorly, tightening the anterior band and fanning out the posterior band [69]. With internal rotation, the inferior glenohumeral ligament hammock slides posteriorly and inferiorly, tightening the posterior band and fanning out the anterior band [69]. The anteroinferior glenohumeral ligament complex is the main stabilizer to anterior and posterior stresses when the shoulder is abducted 45 degrees or more [69]. The superior glenohumeral ligament is the primary restraint to inferior humeral subluxation in 0 degrees of abduction and the primary stabilizer to anterior and posterior stress in the same position [69]. The middle glenohumeral ligament limits external rotation when the arm is in the lower and middle ranges of abduction but has little effect when the arm is in 90 degrees of abduction [69].

The coracohumeral ligament is a thick band of fibrous tissue extending from the coracoid process along the surface of the capsule to the tuberosities between the supraspinatus and subscapularis tendons [69]. The coracohumeral ligament is deep to the tendinous insertion of the cuff and blends with the capsule and supraspinatus tendon to form part of the roof of the biceps sheath [69]. The tendons of the infraspinatus and supraspinatus muscles join approximately 15 mm proximal to their insertion and cannot be readily separated by blunt dissection [69]. The infraspinatus and teres minor fuse near their musculotendinous junctions [69]. The supraspinatus and subscapularis tendons join as a sheath that surrounds the biceps tendon at the entrance of the bicipital groove [69]. The roof of the biceps sheath consists of a portion of the supraspinatus tendon, and a sheet of the subscapularis tendon forms the floor [69].

The subscapular bursa lies between the subscapularis tendon and the neck of the scapula and communicates with the joint cavity between the superior and middle glenohumeral ligaments [60]. The subscapular bursa protects the tendon of the subscapularis at the point where it passes under the base of the coracoid process and over the neck of the scapula [60]. The subscapular bursa often houses loose bodies in the shoulder and is a region where synovitis may be most intense [60]. Synovial recesses in the anterior capsule show extreme variability, with Type 3 (one recess above and one below the middle glenohumeral ligament) being the most common at 40.6% [60]. DePalma believed that if the capsule begins farther medially on the scapula or glenoid neck, synovial recesses are larger and more numerous, resulting in a thin, weakened anterior capsule that could predispose the shoulder to instability [60]. The average area of the rotator interval is 20.96 mm [60]. Dynamic testing shows that subscapularis and supraspinatus dimensions as well as the total area of the rotator interval decrease significantly with internal rotation and open with external rotation [60].

Bursae and Motion Interface

The subacromial bursa separates the rotator cuff tendons from the coracoacromial arch, allowing them to glide [64]. The humeroscapular motion interface lies between the inner structures of the proximal humerus, rotator cuff, coracohumeral ligament, and biceps tendon sheath and the superficial layer of the acromion, deltoid, coracoacromial ligament, coracoid process, and conjoined tendon [62]. Smooth, unrestricted motion at the humeroscapular motion interface is vital to shoulder mobility [62]. Adhesions in the humeroscapular motion interface can limit shoulder mobility, as seen in subacromial adhesions in cuff disease and after proximal humerus fracture [62]. The axillary nerve has an intimate relationship within the humeroscapular motion interface [62].

Pathophysiology of Stiffness and Adhesive Capsulitis

Adhesive capsulitis presents clinically as limited, active and passive range of motion caused by the formation of adhesions of the glenohumeral joint capsule [25]. Radiographically, adhesive capsulitis is characterized by thickening of the capsule and rotator interval [25]. The pathology of adhesive capsulitis relates to inflammation and formation of extensive scar tissue [25]. Risk factors for adhesive capsulitis include diabetes, hyperthyroidism, and previous cervical spine surgery [25].

Frozen shoulder is characterized by pain and restricted glenohumeral joint motion, especially external rotation [44]. Frozen shoulder typically affects individuals aged 40 to 70 years, with the nondominant side more frequently affected and female sex more common [44]. The majority of frozen shoulder cases are idiopathic, with patients with diabetes or thyroid disease disproportionally affected [44]. Other associations for frozen shoulder include prolonged chest or breast surgery and prolonged immobilization [44]. The essential lesion in frozen shoulder involves the coracohumeral ligament and the rotator interval capsule [44]. Histologically, frozen shoulder shows evidence of inflammation and fibrosis with a dense matrix of type III collagen containing fibroblasts and myofibroblasts similar to findings in Dupuytren disease [44].

Diagnosis of frozen shoulder is clinical, typically involving an insidious onset of pain followed by selective loss of external rotation, with global ROM loss occurring in later stages [44]. In frozen shoulder, active ROM and passive ROM are classically equivalent [44]. Glenohumeral osteoarthritis and a locked posterior shoulder dislocation are two other causes of selective loss of external rotation, necessitating radiographs before a diagnosis of frozen shoulder is made [44]. Arthrography may demonstrate a loss of the normal axillary recess, revealing contracture of the joint capsule in frozen shoulder [44]. MRI may show thickening of the glenohumeral joint capsule along the axillary pouch, thickening of the coracohumeral ligament, obliteration of the subcoracoid fat triangle, and rotator interval synovitis in frozen shoulder, though none of these findings are pathognomonic [44].

Posttraumatic or postsurgical stiffness results from excessive scar formation [44]. Motion loss in posttraumatic or postsurgical stiffness is related to the area of surgery or trauma and may involve the humeroscapular motion interface, as well as contracture of the rotator cuff and capsule [44]. Causes of limitation of motion at the shoulder fall into two categories: structural and nonstructural changes in the periarticular tissues [100]. Structural changes include shortening of the capsule, ligaments, and muscles around the shoulder complex, accompanied by adhesions resulting from a combination of trauma and immobilization [100]. Experimental studies indicate that trauma followed by immobilization causes compositional and structural changes in dense connective tissue structures, including extracellular water loss, glycoaminoglycan depletion, excessive collagen cross-linking, and fibrofatty deposition [100]. These structural changes play a major role in the joint contracture process and may limit a joint's passive range of motion [100]. Nonstructural changes associated with shoulder limitation of motion include pain and protective muscle contractions [100]. Following musculoskeletal injury, increased joint effusion may distend the joint capsule and contain chemical irritants, producing pain, muscle spasm, and limited motion [100].

Most studies indicate that frozen shoulder involves both synovial inflammation and capsular fibrosis [147]. In frozen shoulder, pain precedes stiffness, suggesting that inflammation evolves to fibrosis [147]. Cytokines such as TNF-alpha and interleukins produce synovitis in both the glenohumeral joint and the subacromial bursa in frozen shoulder [147]. Matrix-bound TGF-beta may act as a persistent stimulus resulting in capsular fibrosis in frozen shoulder [147]. The initiator of synovitis in frozen shoulder remains unclear, with postulations including immunomodulated chronic inflammation or degeneration or injury of the rotator cuff tendon [147]. It is uncertain whether frozen shoulder is a process similar to Dupuytren's contracture, potentially involving a failure of collagen remodeling due to genetic failure to activate gelatinase A or elevation of natural inhibitors of matrix metalloproteinases in the joint capsule [147]. Frozen shoulder can be induced by administering a synthetic matrix metalloproteinase inhibitor, suggesting that a decrease in the ratio of matrix metalloproteinases to their inhibitors affects collagen turnover [147].

The pathophysiology of frozen shoulder differs between the upper and lower parts of the joint capsule [103]. Myofibroblast upregulators are elevated in joint capsules in posttraumatic contractures [132]. Posterior glenohumeral joint capsule contracture alters humeral head translations and/or the humeral axis of rotation during movement, creating conditions that lead to joint pathology [108]. The anatomical structure of passive shoulder restraints has no impact on the difference in passive joint position sense values between external and internal rotation [101]. The inferior capsular region has a more significant comparative strain during glenohumeral rotational motion than previously documented [110]. Puncture of the joint capsule results in significant glenohumeral translation in unloaded and loaded specimens during shoulder abduction, with a maximum of 16.6 mm of distal translation observed at 20° of abduction [115].

Classification

Natural History Stages: Frozen shoulder is a benign condition characterized by three distinct stages: ‘freezing’, ‘frozen’, and ‘thawing’ [37]. The restriction in range of motion inherent to this condition results from thickening of the coracohumeral ligament, rotator interval, and anterior capsule [37].

Etiologic Groups: Arthroscopic capsular release has demonstrated equal effectiveness across five identified etiologic groups of stiff shoulders [2].

Technique Variations: Patients undergoing arthroscopic capsular release for idiopathic frozen shoulder are grouped by specific surgical techniques, including anterior-inferior capsular release, anterior-inferior-posterior capsular release, and 360-degree capsular release [6].

Other Considerations: Arthroscopic capsular release is a reliable method for restoring motion with minimum morbidity in carefully selected patients with adhesive capsulitis of the glenohumeral joint [1]. It provides significant pain relief, restoration of motion, and function within an average of 3 months for stiff shoulders [2]. In the short term, patients experience almost immediate relief of pain and symptoms, along with dramatic improvements in range of motion [5]. Although outcomes are favorable at a mean 24 months follow-up, more than 50% of patients experienced persistent pain and motion limitations at the 6-months postoperative follow up [9]. For refractory primary frozen shoulder syndrome, arthroscopic capsular release emerges as a suitable option that leads to a faster and long-lasting recovery [10]. However, the quality of available evidence is low, and data demonstrate little benefit for capsular release instead of, or in addition to, manipulation under anesthesia (MUA) [11].

Conservative treatment remains the primary choice for shoulder stiffness, with MUA or arthroscopic capsular release indicated for refractory cases [13]. Early intervention in patients with frozen shoulder will most likely lead to a considerable amount of needless surgical procedures given the natural course of this condition, which involves spontaneous resolution of symptoms in the majority of patients [138]. Surgical intervention for adhesive capsulitis includes arthroscopic capsular release, MUA, or both [15]. Both arthroscopic capsular release and MUA are efficacious for adhesive capsulitis [15]. Patients who underwent arthroscopic capsular release for idiopathic adhesive capsulitis experienced significant reductions in pain, improvements in range of motion, and improvements in overall shoulder function in the first postoperative week [12].

Each segment of the joint capsule affected range of motion (ROM) in all directions, supporting the need for whole-joint capsular release [14]. ROM was significantly greater on the affected side than on the unaffected side after surgery for frozen shoulder [14]. Arthroscopic capsular release produces early symptom improvement in primary frozen shoulder [21]. The presence of concomitant shoulder pathologies does not appear to affect the clinical outcomes in patients undergoing arthroscopic capsular release for frozen shoulder [26]. Arthroscopic capsular release is a reliable and efficient method for frozen shoulder patients [29].

In patients with recalcitrant adhesive capsulitis, the addition of the posterior capsular release did not improve patient function or ROM over anterior capsular release alone at 6 months [18]. Both manipulation and capsular release with manipulation significantly improved range of motion and produced satisfactory functional outcomes for shoulder stiffness concomitant with rotator cuff repair [17]. Arthroscopic release resulted in normal motion in all cases of postoperative stiffness following arthroscopic rotator cuff repair [27]. The influence of the arthroscopic capsular release, in conjunction with the release of the subscapularis tendon, was very high above 0° of elevation [31].

All patients in a study of primary and secondary adhesive shoulder capsulitis had an arthroscopic 360 degree capsular release [32]. The average operative time for arthroscopic 360 degree capsular release was 28 min (range 10–109 min) [32]. Initially, an anterior–superior capsular release was done in the rotator cuff interval to resect the coraco-humeral ligament [32]. The release of the coraco-humeral ligament was performed up to the base of the coracoid [32]. The subscapularis tendon has to be freed sequentially both intra- and extra-articularly to attain an adequate subscapularis tendon gliding [32]. With the assistant holding the arm in a position of slight external rotation, the inferior gleno-humeral ligament would become visible [32]. Capsular release and synovectomy are performed at the inferior gleno-humeral ligament [32]. By performing slight abduction and external rotation, the release of the inferior gleno-humeral ligament could be performed as close as possible to the glenoid [32]. All 3 procedures for anterior capsular shift volume reduction resulted in a significant reduction in capsular volume [24].

Complications of surgical intervention for adhesive capsulitis include fracture, glenoid and labral injuries, neurapraxia, and rotator cuff pathology [25].

Clinical Presentation

Frozen shoulder is a benign condition characterized by a protracted painful and disabling course, typically progressing through three stages: ‘freezing’, ‘frozen’, and ‘thawing’, with eventual recovery [37]. Despite this benign classification, many patients experience long-term pain and stiffness [37]. The syndrome has a prevalence of 2% in the general population [37]. The typical patient is a female between 40 and 60 years of age [37]. Diabetic patients have a significant predisposition to developing frozen shoulder, with a prevalence of up to 20% in this population group [37].

The clinical presentation is characterized by an insidious onset of true shoulder pain, including night pain [97]. Physical examination reveals global restriction of passive shoulder motion [81]. Specifically, passive forward elevation is restricted to less than 100° and external rotation is less than one-half of normal [97]. Diagnosis is established based on this global restriction of passive motion in the presence of normal plain radiographs [81].

Radiographic findings in adhesive capsulitis include thickening of the capsule and rotator interval [25]. Magnetic resonance imaging findings for frozen shoulder include no definite abnormalities at the rotator cuff, labrum, long head of the biceps, or acromioclavicular joint [81]. Arthroscopic findings confirming the diagnosis include inflamed synovium and a thickened rotator interval and capsule [81].

Investigations

Plain radiography: Standardized plain films are almost always sufficient to garner the information needed for shoulder evaluation [41]. The standard shoulder series should include orthogonal views of the shoulder, including a true AP view in the scapular plane, an AP view, an axillary view, and a scapular Y view [83]. At least two X-ray views should be obtained for shoulder imaging: an anteroposterior in the plane of the glenoid and an axillary projection with the arm in abduction to show the relationship of the humeral head to the glenoid [73].

The first key radiographic view is the anteroposterior (AP) in the plane of the scapula, taken so that the x-ray beam passes through the glenohumeral joint [41]. The true AP view in the scapular plane visualizes anterior greater tuberosity in profile and can reveal proximal humeral migration [83]. The AP view in the plane of the scapula shows the superoinferior position of the humeral head relative to the glenoid, the presence of osteophytes on the humeral head and glenoid, narrowing of the joint space, and the degree of medial displacement of the humerus in relation to the lateral acromial line [41]. The AP view with the arm held in internal rotation visualizes the posterior aspect of the greater tuberosity and the lesser tuberosity in profile [83].

The second key radiographic view is the axillary view taken with the arm in the functional position of elevation in the plane of the scapula [41]. The axillary view is oriented so that both the spinoglenoid notch and the scapular neck are visible [41]. The axillary view demonstrates the glenohumeral relationships in the functional position of elevation and is referred to as the "truth view" [41]. The standardized axillary view enables the measurement of posterior subluxation or "functional decentering" that is not evident in images taken with the arm at the side [41]. The axillary view is necessary for evaluation of glenohumeral joint instability and enables determination of the humeral head position in the glenoid fossa [83]. The axillary view may detect occult, locked posterior shoulder dislocation in a patient who exhibits a lack of passive external rotation [83].

The degree of posterior subluxation can be measured as the position of the center of the humeral head in relation to the plane of the scapula, the position of the center of the humeral head in relation to the glenoid face, or the point of contact of the humeral articular surface on the glenoid articular surface [41]. The point of contact of the humeral articular surface on the glenoid articular surface reflects the degree of centering of the net humeral joint reaction force on the glenoid [41]. The scapular Y view provides visualization of the coracoacromial arch and can reveal coracoacromial spurs [83]. The scapular Y view is a reliable alternative for evaluation of glenohumeral subluxation and dislocation [83].

Normal radiographic measurements include an acromiohumeral distance of 7 to 14 mm [83], a symmetric superior and inferior glenohumeral joint space width [83], and a coracoclavicular distance of 1.1 to 1.3 cm [83].

MRI: Magnetic resonance imaging (MRI) is the modality of choice for evaluating the rotator cuff, biceps, and subacromial/subdeltoid bursa [80]. MRI is useful to identify osteonecrosis of the humeral head, or a bone tumour [73]. MRI can identify labral tears and rotator cuff tears, although the accuracy for these is enhanced by combining the scan with arthrography [73]. T1-weighted MRI can reveal Hill-Sachs lesions and is often used with magnetic resonance (MR) arthrograms to provide a more detailed picture of the joint surfaces [80]. T2-weighted MRI provides better visualization of full thickness rotator cuff tears [80].

MR arthrography (MRA) is considered the benchmark for evaluation for labral tears and rarely is indicated for evaluation of rotator cuff pathology [80]. MRA has greater diagnostic test accuracy for the detection of glenoid labral lesions compared to MRI, with MRA sensitivity of 88% and specificity of 93% versus MRI sensitivity of 76% and specificity of 87% [78]. Abduction and external rotation (ABER) of the arm is an alternative position utilized to increase the sensitivity and specificity for detecting anteroinferior labroligamentous injury [78]. The sensitivity of MRA with the ABER position for detecting anteroinferior labral lesions is significantly higher than that of the MRA in neutral position [78]. MRA is more effective in identifying Perthes lesions when using the ABER position compared to the neutral position [78].

MRAs can demonstrate a patulous capsule on the coronal, sagittal, and axial imaging in patients with multidirectional instability [78]. MRAs can be helpful in evaluating lesions of the rotator interval and other associated findings that may affect the eventual surgical plan [78]. The presence of glenoid dysplasia, increased capsular cross-sectional area, and increased glenoid retroversion have been found to be associated with increased posterior labral tears and symptomatic instability [78]. Glenoid retroversion was significantly increased in patients with symptomatic posterior labral tears [78]. There was no significant association between instability and increased humeral head subluxation in patients with multidirectional instability [78]. The diagnosis of multidirectional instability is a clinical one, and the need for expensive and/or invasive imaging should be weighed against the information that will be gained from these studies [78].

Seven informative MRI features were identified for diagnosing adhesive capsulitis of the shoulder, with axillary capsular enhancement and rotator interval joint capsule thickening showing the highest diagnostic accuracy [127]. MRI findings showed reduced joint capsule thickness and effusion following interventional microadhesiolysis for adhesive capsulitis [105]. A capsular tear running from the glenoid to the humeral head perpendicular to the usual orientation is a rare cause of anterior glenohumeral instability that may not be detected on preoperative MRI [144].

CT: Computed tomography (CT) is helpful for planning fracture surgery and shoulder joint replacement [73]. CT with three-dimensional reconstructions is the advanced imaging study of choice for determining the extent of glenoid bone loss in the setting of shoulder instability [83]. When MRI or MR arthrography is contraindicated, CT arthrography is indicated [80].

Ultrasonography: Ultrasonography is a simple and accurate test for identifying rotator cuff tears and calcific tendinitis [73]. Ultrasonography is a low-cost alternative to MRI and arthrography for evaluating both skeletal and soft-tissue structures of the shoulder [80]. Ultrasonography can provide immediate, real-time visualization of the rotator cuff, biceps tendon, and calcific deposits [80]. Ultrasonography can be used to measure the subacromial space and detect atrophy of rotator cuff muscles [80]. Ultrasonography can be useful in guiding injections or barbotage (aspirating calcific deposits in the rotator cuff) [73].

Ultrasonography is highly operator dependent and is not as useful for evaluating labral tears or rotator cuff tears that are very small or larger than 3 cm [80]. The sensitivity of ultrasonography for the detection of full-thickness rotator cuff tears is 98% [83], with a specificity of 80% [83], a positive predictive value of 90% [83], a negative predictive value of 95% [83], and an accuracy of 94% [83]. The sensitivity of MRI for the detection of full-thickness rotator cuff tears is 100% [83], with a specificity of 68% [83], a positive predictive value of 85% [83], a negative predictive value of 100% [83], and an accuracy of 89% [83]. Magnetic resonance (MR) accuracy in identifying labral and rotator cuff tears in the literature ranges from 70% to 100% [78].

Arthroscopy: Arthroscopy is useful for diagnosing and treating subacromial impingement, intra-articular lesions, detachment of the glenoid labrum and rotator cuff tears [73].

Treatment

Non-Operative

Arthroscopic capsular release is indicated for refractory cases of shoulder stiffness after conservative treatment fails [13]. Patients in whom 12 to 16 weeks of nonsurgical treatment fail are offered arthroscopic capsular release [44, 45]. In patients with refractory primary frozen shoulder syndrome, arthroscopic capsular release is a suitable option that leads to a faster and long-lasting recovery [10]. In our experience, surgical treatment for idiopathic frozen shoulder is necessary for less than 5% of those seeking care [50].

Operative

Indications: Arthroscopic capsular release is the most effective therapeutic method in terms of pain relief, followed by physiotherapy and intraarticular steroid injection, while NSAID therapy did not provide significant pain relief [123]. In the short term, patients who have had capsular release get almost immediate relief of pain and symptoms and dramatic improvements in range of motion, which has not been seen with injections or physiotherapy [5]. Arthroscopic capsular release was equally effective across five identified etiologic groups, providing significant pain relief, restoration of motion, and function within an average of 3 months [2]. Arthroscopic capsular release provided significant pain relief and improvement in shoulder function in patients with frozen shoulder regardless of the timing of surgery [36]. Patients with idiopathic and post-traumatic shoulder stiffness have better outcomes than patients with postsurgical stiffness [53]. Both manipulation and capsular release with manipulation significantly improved range of motion and produced satisfactory functional outcomes in shoulder stiffness concomitant with rotator cuff repair [17]. Although there are limited nonarthroplasty surgical options available for glenohumeral arthritis, isolated arthroscopic debridement and capsular release may not provide substantial benefit to justify its use in most patients [8]. Arthroscopic capsular release is a very cost-effective procedure that can restore relatively normal function and health-related quality of life in most patients with shoulder contracture within six months of surgery [30].

Surgical Approach / Technique: The main objective of arthroscopic release is to perform a systematic release for the rotator interval, superior glenohumeral ligament, coracohumeral ligament, anterior capsule, middle glenohumeral ligament, inferior glenohumeral ligament (anterior and posterior bands), inferior capsule, and posterior capsule [50]. Arthroscopy allows for a more controlled and complete capsular release not achieved with manipulation [92]. The arthroscopic 360° capsular release in the lateral decubitus position provides a comprehensive surgical treatment for patients with adhesive capsulitis by addressing inflamed/scarred capsular tissue in its entirety and obviating the need for manipulation under anesthesia [119]. Selective arthroscopic releases may accomplish specific gains in motion: rotator interval release for external rotation, inferior capsule release for external rotation/flexion/internal rotation, and posterosuperior capsule release for internal rotation [42]. All 3 anterior capsular shift procedures resulted in a significant reduction in capsular volume [24]. The addition of the posterior capsular release did not improve patient function or ROM over anterior capsular release alone at 6 months in patients with recalcitrant adhesive capsulitis [18]. Posterior extended capsular release might not be necessary in arthroscopic surgery for shoulder stiffness [38]. Patients with diabetes require complete circumferential release if manipulation does not restore full motion [42]. Postsurgical contractures usually require a combined arthroscopic and open release, and a subscapularis lengthening may be necessary to restore external rotation [42].

Pain Management: Postoperative pain control is obtained with interscalene block, passive range of motion, careful follow-up, and early 3- to 4-week reintervention with arthroscopic procedures when indicated [42]. A supraclavicular catheter is placed before surgery under ultrasound guidance and left in place for pain management for the first 48 to 72 hours after surgery [42]. An interscalene nerve block or indwelling catheter in the recovery room has been shown to be beneficial in allowing the patient to tolerate early motion following shoulder arthroscopy [92].

Postoperative Care and Rehabilitation: Postoperative care should always include immediate active-assisted range-of-motion exercises and physical therapy for passive- and active-assisted range of motion started within 24 hours [42]. Stretching exercises must be performed in all four quadrants, five times a day, with five repetitions of each stretching maneuver [42]. Physical therapy with aggressive ROM and hydrotherapy is recommended 5 days per week for the first 2 weeks and three times per week until mobility is achieved [92].

Complications and Risks: This procedure places the axillary nerve at risk [44, 45]. If an arthroscopic release is to be performed in the 5-o’clock to 7-o’clock position at the inferior capsule, stay within 1 cm of the inferior capsule from muscle to protect the axillary nerve [42]. Perform the inferior capsular release no more than 1 cm from the inferior labrum to avoid risk to the neurovascular structures [42]. Complications include fracture, glenoid and labral injuries, neurapraxia, and rotator cuff pathology [25]. A recent systematic review found an overall complication rate of 0.6% during or following an arthroscopic capsular release, with superficial wound infection and brachial plexopathy cited as most common [92]. Pseudocholinesterase deficiency may be associated with a risk of atraumatic dislocation following arthroscopic capsular release and manipulation under anesthesia [121].

Complications

Fracture and Labral Injuries: Arthroscopic capsular release for adhesive capsulitis carries risks of fracture, glenoid and labral injuries, neurapraxia, and rotator cuff pathology [25]. Overzealous application of thermal energy during capsular shrinkage specifically poses a risk to adjacent structures such as the axillary nerve [34].

Nerve Palsy: In a series of 14 patients undergoing arthroscopic anterior capsulotomy for elbow stiffness, no neurovascular complications were observed [122]. Conversely, three transient nerve palsies (2 radial, 1 ulnar) were observed in 15 patients following open anterior elbow capsulotomy, all of which resolved over a course of 3 weeks to 7 months [122]. Transient paresthesias of the ulnar nerve were noted in 1 of 7 patients following open elbow capsulotomy [122]. In a systematic review of arthroscopic Bankart repair, nerve complications occurred in 0.07% of patients, with the musculocutaneous and axillary nerves being the most commonly affected [143].

Infection: In a series of 14 patients undergoing arthroscopic anterior capsulotomy for elbow stiffness, one patient experienced a superficial portal site infection that resolved with drainage and oral antibiotic therapy [122]. Wound complications occurred in 0.03% of patients following arthroscopic Bankart repair, with no deep wound infections reported [143].

Stiffness / Arthrofibrosis: In a systematic review of arthroscopic Bankart repair, frozen shoulder was the most common complication, occurring in 0.32% of cases [143]. Musculoskeletal complications occurred in 0.30% of patients following arthroscopic Bankart repair, with frozen shoulder (0.21%) and biceps tendonitis (0.04%) being the most common [143]. In a case report of arthroscopic pan-capsular release following lower trapezius tendon transfer, the patient developed secondary adhesive capsulitis despite following the standard postoperative rehabilitation protocol [150].

Other Considerations: Persistent pain occurred in 0.15% of patients following arthroscopic Bankart repair [143]. Hardware complications occurred in 0.05% of patients following arthroscopic Bankart repair, with the majority being symptomatic hardware [143].

Recovery

Light activity (weeks): Patients undergoing arthroscopic capsular release for idiopathic adhesive capsulitis experience significant reductions in pain, improvements in range of motion, and improvements in overall shoulder function in the first postoperative week [12]. Patients who have had capsular release experience almost immediate relief of pain and symptoms and dramatic improvements in range of motion in the short term [5].

Full activity (months): Arthroscopic capsular release provides significant pain relief, restoration of motion, and function within an average of 3 months [2]. Arthroscopic capsular release for primary and secondary frozen shoulder results in an overall rapid significant improvement [28].

Complete recovery / outcome plateau (months): More than 50% of patients experienced persistent pain and motion limitations at the 6-months postoperative follow up after arthroscopic capsular release [9].

Other Considerations: Patients with a frozen shoulder and a duration of symptoms <10 months made greater improvements in internal rotation following arthroscopic capsular release compared with patients who had a longer duration of symptoms [35]. Patients with a frozen shoulder and a duration of symptoms <10 months had similar final results for flexion, abduction, and external rotation following arthroscopic capsular release when compared with patients who had a longer duration of symptoms [35]. There is no reason to delay surgery for arthroscopic capsular release in patients with frozen shoulder based on symptom duration [35]. High patient satisfaction and statistically significant ROM and CMS recovery can be achieved after arthroscopic capsular release to manage frozen shoulder [157]. For children with shoulder contracture secondary to brachial plexus palsy, subscapularis-sparing isolated capsular release improves external rotation and functional scores [55]. For children with shoulder contracture secondary to brachial plexus palsy, subscapularis-sparing isolated capsular release avoids any loss of active internal rotation [55]. For children with shoulder contracture secondary to brachial plexus palsy, subscapularis-sparing isolated capsular release does not improve anterior elevation [55].

Key Evidence

• [L4] Arthroscopic capsular release is a reliable method for restoring motion with minimum morbidity in carefully selected patients. [1] (10.1007/s001670100194)
• [L2] Arthroscopic capsular release was equally effective across the 5 identified etiologic groups, and provided significant pain relief, restoration of motion, and function within an average of 3 months. [2] (10.1053/jars.2003.50010)
• [L3] Most shoulders with early motion loss recover motion and rarely require capsular release. [3] (10.1016/j.jse.2009.07.009)
• [L5] Initial management of posterior capsular contracture should be nonsurgical, emphasizing range-of-motion stretching. [4] (10.5435/00124635-200605000-00002)
• [L5] In the short term, patients who have had capsular release get almost immediate relief of pain and symptoms and dramatic improvements in range of motion, which has not been seen with injections or physiotherapy. [5] (10.1177/2325967120903707)
• [L1] Patients were grouped by technique: anterior-inferior capsular release, anterior-inferior-posterior capsular release, and 360-degree capsular release at follow up points 3, 6 and 12 months. [6] (10.1016/j.otsr.2020.102766)
• [L4] Arthroscopic capsular release has a high success rate regardless of the underlying aetiology. [7] (10.1016/j.otsr.2019.02.014)
• [L4] Although there are limited nonarthroplasty surgical options available for glenohumeral arthritis, isolated arthroscopic debridement and capsular release may not provide substantial benefit to justify its use in most patients. [8] (10.1016/j.arthro.2014.08.025)
• [L4] Although arthroscopic capsular release yielded favorable outcomes at mean 24 months follow-up, more than 50% of our patients experienced persistent pain and motion limitations at the 6-months postoperative follow up. [9] (10.5397/cise.2018.21.3.127)
• [Paper] In patients with refractory primary frozen shoulder syndrome, arthroscopic capsular release emerges as a suitable option that leads to a faster and long-lasting recovery. [10] (10.1016/j.eats.2015.06.004)
• [L4] The quality of evidence available is low and the data available demonstrate little benefit for a capsular release instead of, or in addition to, an MUA. [11] (10.1016/j.jse.2013.01.010)
• [L4] Patients who underwent an arthroscopic capsular release for idiopathic adhesive capsulitis experienced significant reductions in pain, improvements in range of motion, and improvements in overall shoulder function in the first postoperative week. [12] (10.1016/j.jse.2015.12.025)
• [L5] Conservative treatment is the primary choice for shoulder stiffness, with manipulation under anesthesia or arthroscopic capsular release indicated for refractory cases; arthroscopic capsular release is preferred due to risks associated with manipulation, and stepwise rehabilitation is mandatory after release. [13] (10.1016/j.arthro.2016.03.024)
• [L4] Each segment of the joint capsule affected ROM in all directions, supporting the need for whole-joint capsular release; ROM was significantly greater on the affected side than on the unaffected side after surgery. [14] (10.1016/j.jse.2020.01.085)
• [L5] Surgical intervention, typically considered after 9 to 12 months of failed nonsurgical management, includes arthroscopic capsular release, manipulation under anesthesia (MUA), or both, both of which are efficacious. [15] (10.1016/j.arthro.2025.03.027)
• [L5] Circumferential capsular release improves range of motion in shoulder pathologies, particularly where no bony deformities exist, and the technique has evolved over time with benefits confirmed by recent studies. [16] (10.1016/j.arthro.2012.10.003)
• [L3] Both manipulation and capsular release with manipulation significantly improved range of motion and produced satisfactory functional outcomes. [17] (10.1177/0363546513519326)
• [L1] In this broad group of patients with recalcitrant adhesive capsulitis, the addition of the posterior capsular release did not improve patient function or ROM over anterior capsular release alone at 6 months. [18] (10.1016/j.arthro.2010.02.020)
• [L4] The long-term results of arthroscopic capsular release in frozen shoulder were confirmed in 255 patients. [19] (10.1186/s13018-018-0758-5)
• [L1] Arthroscopic capsular release produces early symptom improvement in primary frozen shoulder. [21] (10.1111/j.1758-5740.2009.00025.x)
• [L5] All 3 procedures resulted in a significant reduction in capsular volume. [24] (10.1016/s1058-2746(02)86805-7)
• [L5] [25] (10.5435/jaaos-d-17-00606)
• [L3] The presence of concomitant shoulder pathologies does not appear to affect the clinical outcomes in patients undergoing arthroscopic capsular release for frozen shoulder. [26] (10.1016/j.aott.2018.04.002)
• [L4] Arthroscopic release resulted in normal motion in all cases. [27] (10.1016/j.arthro.2009.01.018)
• [L3] Arthroscopic capsular release for primary and secondary frozen shoulder results in an overall rapid significant improvement. [28] (10.1016/j.arthro.2008.08.006)
• [L3] Arthroscopic capsular release is a reliable and efficient method for frozen shoulder patients. [29] (10.1007/s00402-009-0900-2)
• [L4] Arthroscopic capsular release is a very cost-effective procedure that can restore relatively normal function and health-related quality of life in most patients with shoulder contracture within six months of surgery. [30] (10.1302/0301-620x.95b7.31197)
• [L5] The influence of the arthroscopic capsular release, in conjunction with the release of the subscapularis tendon, was very high above 0° of elevation. [31] (10.1016/j.jse.2005.09.018)
• [L4] [32] (10.1007/s00167-012-2124-1)
• [L5] [34] (10.1067/mse.2000.103659)
• [L3] Patients with a frozen shoulder and a duration of symptoms <10 months made greater improvements in internal rotation and had similar final results for flexion, abduction, and external rotation following arthroscopic capsular release when compared with patients who had a longer duration of symptoms, so there is no reason to delay surgery. [35] (10.1177/2325967119867621)
• [L3] Arthroscopic capsular release provided significant pain relief and improvement in shoulder function in patients with frozen shoulder regardless of the timing of surgery. [36] (10.1016/j.jse.2020.07.023)
• [L4] [37] (10.1177/1758573215578590)
• [L1] Posterior extended capsular release might not be necessary in arthroscopic surgery for shoulder stiffness. [38] (10.1177/0363546514523720)
• [L4] Patients with idiopathic and post-traumatic shoulder stiffness have better outcomes than patients with postsurgical stiffness. [53] (10.1016/j.jse.2009.08.004)
• [L4] For children with shoulder contracture secondary to brachial plexus palsy, subscapularis-sparing isolated capsular release improves external rotation and functional scores and avoids any loss of active internal rotation but does not improve anterior elevation. [55] (10.1016/j.jse.2018.01.022)
• [L5] [81] (10.1016/j.jse.2018.11.072)
• [L2] [97] (10.1016/j.jse.2018.04.002)
• [L5] [100] (10.1016/s0894-1130(12)80081-0)
• [L3] The anatomical structure of passive shoulder restraints has no impact on the difference in passive joint position sense values between external and internal rotation. [101] (10.1186/s12891-016-0971-5)
• [L5] The pathophysiology of frozen shoulder differs between the upper and lower parts of the joint capsule. [103] (10.1016/j.jse.2018.03.010)
• [L4] MRI findings showed reduced joint capsule thickness and effusion following the procedure. [105] (10.1186/1471-2474-9-12)
• [L5] Posterior glenohumeral joint capsule contracture alters humeral head translations and/or the humeral axis of rotation during movement, creating conditions that lead to joint pathology. [108] (10.1111/j.1758-5740.2012.00180.x)
• [L5] The inferior capsular region has a more significant comparative strain during glenohumeral rotational motion than has been documented in previous studies. [110] (10.1186/s13018-025-06548-8)
• [L5] Puncture of the joint capsule resulted in significant glenohumeral translation in unloaded and loaded specimens during shoulder abduction, with a maximum of 16.6 mm of distal translation observed at 20° of abduction. [115] (10.1016/1058-2746(93)90064-n)
• [Paper] The arthroscopic 360° capsular release in the lateral decubitus position provides a comprehensive surgical treatment for patients with adhesive capsulitis by addressing inflamed/scarred capsular tissue in its entirety and obviating the need for manipulation under anesthesia. [119] (10.1016/j.eats.2016.05.007)
• [L5] Pseudocholinesterase deficiency may be associated with a risk of atraumatic dislocation following arthroscopic capsular release and manipulation under anesthesia. [121] (10.5435/jaaosglobal-d-24-00135)
• [L4] [122] (10.1016/j.jse.2010.01.003)
• [L4] Arthroscopic capsular release is the most effective therapeutic method in terms of pain relief, followed by physiotherapy and intraarticular steroid injection, while NSAID therapy did not provide significant pain relief. [123] (10.1186/s12891-024-07275-7)
• [L1] Seven informative MRI features were identified, with axillary capsular enhancement and rotator interval joint capsule thickening showing the highest diagnostic accuracy. [127] (10.1186/s12891-025-08592-1)
• [L2] [132] (10.1097/blo.0b013e3180312c01)
• [L5] [138] (10.1177/2325967120903710)
• [L4] [143] (10.1016/j.jse.2023.08.013)
• [L4] A capsular tear running from the glenoid to the humeral head perpendicular to the usual orientation is a rare cause of anterior glenohumeral instability that may not be detected on preoperative MRI. [144] (10.1016/j.arthro.2008.09.019)
• [L4] [147] (10.1007/s00776-013-0495-x)
• [Case_report] [150] (10.1016/j.xrrt.2023.12.002)
• [L3] High patient satisfaction and statistically significant ROM and CMS recovery can be achieved after arthroscopic capsular release to manage frozen shoulder. [157] (10.1007/s00167-023-07561-2)

See Also

• Frozen Shoulder
• Rotator Cuff Repair
• Rotator Cuff
• Proximal Humerus Fracture
• Shoulder Instability
• Calcific Tendinitis
• Shoulder Arthroscopy

References

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