Introduction
Capsular patterns are a classic clinical concept in the examination of synovial joints, but are nowadays rarely mentioned explicitly in modern literature. The phenomenon was systematized by James Cyriax and describes how joints with intra-articular pathology develop a characteristic and relatively predictable loss of passive mobility in certain directions. This loss of movement does not occur randomly, but follows a pattern that reflects the anatomy of the capsule, fiber orientation, and the mechanical loads that occur during different movements (1).
For the inexperienced clinician, the concept can be difficult to understand at first encounter. Movement restrictions are affected not only by structural conditions in the joint, but also by pain, muscular protection, and the patient's own movement strategy. In addition, capsular patterns are rarely complete in early stages of disease, and in more advanced cases the pattern can become difficult to identify because multiple movements gradually become globally reduced. Despite this, the concept provides a valuable framework for structuring clinical observations and helping to differentiate between intra-articular and extra-articular pathology.
Even though the concept of 'capsular pattern' is rarely used in newer studies, the same clinical observations are still described in practice. This is particularly evident in conditions such as adhesive capsulitis of the shoulder, where characteristic movement restrictions are a central part of the diagnosis (2). It can therefore be argued that it is not the phenomenon that has lost relevance, but rather the terminology and the way it is referred to.
Clinical understanding and application
A capsular pattern implies that several passive movements in a joint are reduced in a specific relationship to each other. It is precisely this relationship that is diagnostically interesting, not the degree of limitation in each individual movement in isolation. Each synovial joint has its characteristic pattern, and identifying this can help to locate the pathology to the joint itself and strengthen the suspicion of intra-articular involvement (1–3).
In clinical practice, this requires a systematic examination where all relevant movements are tested and compared. The assessment should include both range of motion, pain provocation, and end-feel. The end-feel provides important additional information. Normally, passive capsular movements are characterized by an elastic (slightly springy) end-feel. In capsular restriction, the resistance becomes gradually firmer and less yielding due to reduced capsular elasticity and increased stiffness of the joint capsule. In more pronounced joint involvement, the end-feel may appear hard. Mechanical blockages, muscular protection, or other extra-articular limitations, on the other hand, produce other characteristic end-feels (1–3).
It is important to emphasize that a capsular pattern does not constitute a diagnosis in itself, but rather a clinical finding. The finding must always be interpreted in the light of the patient's medical history, other clinical findings, and any supplementary examinations. At the same time, identifying such a pattern can help structure the diagnostic process and reduce uncertainty in clinical reasoning.
Capsular patterns in different joints
Shoulder – glenohumeral joint
The capsular pattern in the shoulder joint is characterized by the greatest reduction in external rotation, followed by abduction, and finally internal rotation (1–3). This pattern reflects how the capsular structures, particularly in the rotator interval and the anterosuperior capsule, are stretched during movement.
Clinically, this pattern typically occurs in adhesive capsulitis. In the early phase, pain dominates, especially in end positions, and passive external rotation is often both the most painful and the earliest to be reduced. Gradually, more pronounced and persistent stiffness develops, where multiple movements are progressively limited and the pattern becomes clearer (4).
The examination should include systematic testing of passive external rotation, abduction, and internal rotation in the glenohumeral joint, as well as assessment of end-feel. When evaluating mobility, it is important to distinguish between glenohumeral movement and total shoulder elevation. Pure glenohumeral abduction normally constitutes approximately 90°, while further elevation is achieved through an interplay between the glenohumeral joint and scapulothoracic motion. The glenohumeral joint normally has about 90° of abduction and 90–100° of external rotation. Internal rotation varies more between individuals and measurement methods, and comparison with the opposite side is therefore often more informative than absolute reference values.
During passive abduction, the examiner can palpate the inferior angle of the scapula to assess the timing of scapular movement. Early scapular rotation before the expected glenohumeral range can be a useful clinical sign of reduced glenohumeral mobility and help to identify an early capsular pattern. Comparison with the opposite shoulder will often make such side differences easier to detect.
Functional tests, such as Apley's scratch test (the test provides a general assessment of shoulder flexibility and function by having the patient try to bring one hand behind the head and down along the back while simultaneously bringing the other hand up behind the back and attempting to touch or meet the hands behind the back), can illustrate how movement restrictions affect daily activities, but have limited value in assessing capsular patterns. At the same time, it is important to assess scapulohumeral rhythm, as compensatory movements often occur with reduced glenohumeral mobility. This becomes particularly evident during elevation above shoulder height, where the arm is gradually brought into flexion or the scapular plane. instead of maintaining pure abduction. Increased scapular co-movement can then mask the degree of glenohumeral movement restriction and contribute to the underestimation of capsular restrictions.
Glenohumeral osteoarthritis and inflammatory arthritis can also cause similar movement restrictions. In osteoarthritis, high age, previous trauma, gradually developed stiffness, and a firmer end-feel may strengthen the suspicion. Inflammatory arthritis is often characterized by involvement of multiple joints, pronounced morning stiffness, and other signs of systemic inflammation.
Elbow – articulatio cubiti
In the elbow joint, the capsular pattern is characterized by reduced flexion and extension, with flexion usually being the most limited (1–3). Pronation and supination are often relatively preserved in early stages, which can be a useful diagnostic feature.
On examination, flexion is often the movement that is limited first. With capsular restriction, the normal elastic end-feel gradually becomes firmer and less yielding, and eventually, extension may also be affected.
An acutely developed capsular movement pattern after elbow trauma should raise strong suspicion of intra-articular injury with hemarthrosis. In clinical practice, this is often caused by an intra-articular fracture, particularly of the radial head or olecranon, rather than an isolated post-traumatic synovitis. If the restriction of movement is accompanied by pain with passive pronation and supination, a fracture of the radial head should be suspected (5)
In lateral epicondylalgia, pain is typically provoked by active and isometric loading of the forearm extensor muscles. Passive elbow extension may be painful and secondarily slightly limited due to stretching of affected tissue. This contrasts with the capsular pattern in the elbow, where flexion is usually the most prominently restricted movement.
Wrist – articulatio radiocarpalis
In the wrist, the capsular pattern is described as an approximately equal reduction in flexion and extension. In clinical practice, this pattern can be more difficult to identify than in larger joints, as the range of motion is easily affected by pain, swelling, synovitis, and muscular protection (1-3).
The examination consists of careful assessment of passive flexion and extension, supplemented with radial and ulnar deviation. End-position sensation and pain reaction provide important information about whether the restriction has a capsular character.
In the event of acute injury, especially after a fall on an outstretched hand, it is crucial to assess for scaphoid fracture, which may be present even with normal initial X-rays (6). In inflammatory conditions, such as rheumatoid arthritis, a more distinct capsular pattern may develop due to synovial involvement.
Differential diagnosis should also consider ligament injuries and TFCC injuries (a TFCC injury is an injury to the triangular fibrocartilage complex, which is a complex of ligaments and fibrocartilage between the ulna, radius, and the ulnar carpal bones, functioning as a stabilizer of the distal radioulnar joint and the ulnar side of the wrist). While ligament injuries often cause pain during specific loads or extreme positions without a characteristic capsular pattern, TFCC injuries can involve the distal radioulnar joint and, in some cases, produce a capsular movement pattern in the distal radioulnar joint, which is a synovial pivot joint between the head of the ulna and the ulnar notch of the radius, that enables pronation and supination in the forearm.
Hip – articulatio coxae
The hip joint has a clearly defined capsular pattern, where internal rotation is most restricted, followed by flexion and abduction (2,7–9). This pattern is of particular clinical significance, as reduced internal rotation is often an early sign of hip osteoarthritis.
The examination should therefore always include careful assessment of passive internal rotation, preferably compared with the opposite side. Reduced internal rotation is often the earliest clinical sign of intra-articular hip involvement. Provocation tests such as FADIR (a provocation test in which the hip is brought into flexion, adduction, and internal rotation to reproduce pain in intra-articular hip pathology, particularly femoroacetabular impingement, so-called FAI) and FABER (a provocation test in which the hip is brought into flexion, abduction, and external rotation (figure-4 position) to uncover pain or dysfunction in the hip joint or sacroiliac joint) may be used as a supplement in suspected intra-articular pathology, but contribute in limited extent to the assessment of the capsular pattern.
The patient will often report pain localized to the groin, combined with a sensation of stiffness. In the early stages, reduced internal rotation is often the most prominent finding. As the capsular involvement or osteoarthritis progresses, flexion, abduction, and extension are also affected, making the classic capsular pattern easier to identify clinically. In advanced osteoarthritis, the movement pattern may deviate from the classic capsular pattern due to pronounced degenerative changes and loss of rotational movements.
Differential diagnosis requires distinguishing between intra-articular causes, such as osteoarthritis and labral injuries, and extra-articular conditions such as tendinopathies or referred pain from the lumbar spine. In children and adolescents, it is particularly important to be aware of conditions such as Legg-Calvé-Perthes disease, epiphysiolysis, and septic arthritis (10,11).
Knee – articulatio genus
In the knee joint, the capsular pattern consists of greater reduction in flexion than in extension (1–3). Reduced flexion is often the first sign of intra-articular involvement before extension is also affected in more pronounced involvement.
The examination should include a systematic assessment of passive flexion and extension, supplemented with tests such as McMurray and Apley's test to assess meniscal pathology. In case of suspected ligament injury, the Lachman test should be included.
A capsular pattern can occur in conditions such as osteoarthritis and synovitis, but it must be distinguished from mechanical obstructions such as meniscal injuries or loose bodies. These often cause a non-capsular pattern in which particular movements are selectively restricted. A classic example is a displaced bucket-handle meniscal tear. This is a longitudinal tear in which the central part of the meniscus detaches and moves into the joint, often into the intercondylar notch, where it can mechanically lock the knee. It often causes a marked loss of extension due to mechanical blockage, while flexion is relatively better preserved. This differs from the more proportional restriction of movement seen with capsular involvement.
Ankle – articulatio talocruralis
The capsular pattern in the ankle joint is classically described as greater restriction in plantarflexion than in dorsiflexion (1–3). In clinical practice, however, this is variable, and reduced dorsiflexion is often the most prominent finding.
The examination should include assessment of both plantar flexion and dorsiflexion, as well as comparison with the opposite side. Weight-bearing and non-weight-bearing assessment of dorsiflexion can provide important additional information. The Silfverskiöld test (a clinical test where passive dorsiflexion in the ankle joint is measured with the knee extended and flexed, respectively, to determine whether the movement restriction is due to a contracture in the gastrocnemius muscle, which causes reduced dorsiflexion only when the knee is extended because the muscle crosses both the knee and ankle, or a contracture in the soleus/Achilles tendon complex, which causes reduced dorsiflexion with both flexed and extended knee) can be useful for identifying muscular causes. to reduced mobility, but cannot alone determine whether the limitation is due to capsular or other intra-articular pathology.
Differential diagnostics must therefore particularly distinguish between capsular involvement and muscular limitations, as well as take previous ligament injuries into account. In case of persistent pain and stiffness, osteochondral lesions of the talus should also be considered (13).
References
- Cyriax JH, Cyriax PJ. Illustrated Manual of Orthopaedic Medicine. 2nd ed. Oxford: Butterworth-Heinemann; 1983.
- Lee BC, Kim BS, Lee BJ, et al. Clinical Practice Guidelines for Diagnosis and Non-Surgical Treatment of Primary Frozen Shoulder. Ann Rehabil Med. 2025;49(3):113–138.
- Petty NJ, Moore AP. Neuromusculoskeletal Examination and Assessment. 5th ed. Edinburgh: Elsevier; 2018.
- Kelley MJ, Shaffer MA, Kuhn JE, et al. Shoulder pain and mobility deficits: adhesive capsulitis. J Orthop Sports Phys Ther. 2013;43(5):A1–A31.
- Morrey BF. The Elbow and Its Disorders. 4th ed. Philadelphia: Saunders Elsevier; 2009.
- Buijze GA, Ochtman L, Ring D. Management of scaphoid nonunion. J Hand Surg Am. 2012;37(5):1095–1100.
- Birrell F, Croft P, Cooper C, et al. Predicting radiographic hip osteoarthritis from range of movement. Rheumatology. 2001;40(5):506–512.
- Neumann DA. Kinesiology of the Musculoskeletal System. 3rd ed. St. Louis: Elsevier; 2017.
- Hand GC, Athanasou NA, Matthews T, Carr AJ. The pathology of frozen shoulder. J Bone Joint Surg Br. 2007;89(7):928–932.
- Loder RT, Skopelja EN. Epidemiology of Legg-Calvé-Perthes disease. ISRN Orthop. 2011;2011:504393.
- Mathews CJ, Weston VC, Jones A, et al. Bacterial septic arthritis. Lancet. 2010;375(9717):846–855.
- Felson DT. Osteoarthritis of the knee. N Engl J Med. 2006;354(8):841–848.
- Verhagen RA, Struijs PA, Bossuyt PM, et al. Diagnostic strategies in osteochondral lesions of the talus. J Bone Joint Surg Am. 2003;85(4):657–664.
