Frozen Shoulder (Adhesive Capsulitis)

Definition

Frozen shoulder (adhesive capsulitis) is a condition characterized by progressive pain and stiffness of the glenohumeral joint, with severe restriction of both active and passive range of motion - particularly external rotation - without any radiographic abnormality. The term was first coined by Codman to describe "slow onset of pain near the deltoid insertion, inability to sleep on the affected side, painful and restricted elevation and external rotation with a normal X-ray."

Epidemiology

Prevalence: ~2-3% in the general population; higher in diabetics
Age: Rare before 40 years; peak onset in the sixth decade
Sex: Women more commonly affected than men
Side: Nondominant side more frequently involved
Contralateral shoulder involvement occurs in 6-17% within 5 years
Recurrence in the same shoulder is uncommon

Classification

Type	Description
Primary (idiopathic)	No identifiable cause; associated conditions include DM, thyroid disease, Dupuytren's, hyperlipidemia, cardiac disease, hemiplegia
Secondary	Results from a known cause - prolonged immobilization, trauma, post-surgery, stroke, impingement, bicipital tendinitis

Pathophysiology & Histology

The essential lesion involves the coracohumeral ligament (CHL) and rotator interval capsule. Histologically, the changes resemble Dupuytren's disease:

Fibroblastic and myofibroblastic proliferation
Deposition of type III collagen in the rotator interval, anterior capsule, and CHL
Increased vascularity, but no change in synovial lining and no inflammatory cell infiltrate
Cytokine, MMP, and MMP inhibitor abnormalities; increased production of growth factors is proposed as the central precursor to capsular fibrosis

The joint capsule adheres to the anatomic neck, and the axillary fold binds to itself, reducing joint volume markedly.

Clinical Stages

Stage	Name	Timing	Features
1	Pre-adhesive / Painful	0-3 months	Acute synovial inflammation; motion limited by pain
2	Freezing	3-9 months	Capsular thickening and scarring; decreased motion + chronic pain
3	Frozen	9-15 months	Less pain but fibrotic thick capsule; severe motion restriction
4	Thawing	>15 months	Progressive improvement in ROM and significant pain reduction

Patients do not necessarily progress through these stages in a linear fashion.

Clinical Features

Insidious onset of diffuse, aching shoulder pain - often spontaneous or following trivial trauma
Pain is worse at night and at rest (especially early stages)
Pain may radiate down the upper arm
Pathognomonic sign: loss of external rotation (active and passive equally affected - this distinguishes it from most other shoulder pathology)
Global ROM restriction in later stages
Disuse muscle atrophy
Active ROM = Passive ROM (distinguishes from rotator cuff tears where there is a discrepancy)

Differential Diagnosis

Two other causes of selective loss of external rotation must be excluded:

Glenohumeral osteoarthritis
Locked posterior shoulder dislocation

For this reason, radiographs must be obtained before diagnosing frozen shoulder. Other differentials: infection, fractures, rotator cuff tear, inflammatory arthritis.

Investigations

X-ray: Normal (rules out OA, posterior dislocation)
Arthrography: Shows loss of normal axillary recess; confirms capsular contracture by decreased joint capsule volume
Ultrasound: Increased vascular flow, thickening of rotator cuff structures, bulging of supraspinatus tendon
MRI: Thickening of glenohumeral joint capsule along axillary pouch, thickening of CHL, obliteration of subcoracoid fat triangle, rotator interval synovitis - sensitivity ~70%, specificity ~95%. None of these findings are pathognomonic.

Management

Non-operative (first-line, ~90% respond)

Modality	Notes
NSAIDs	Pain and inflammation control
Oral corticosteroids	Improve pain and ROM in the short term
Intra-articular steroid injection	Methylprednisolone acetate 40 mg/mL (1 mL) into glenohumeral joint + subacromial bursa; useful especially in early/painful stages
Physical therapy	Ice, ultrasound, TENS, pendulum exercises progressing to active ROM and strengthening; difficult in early painful stages
Distention arthrography (hydrodistention)	Occasionally employed

Avoid shoulder immobilization - if a sling is needed (severe pain in stage 1), limit to daytime use only
Abduction should be avoided initially to prevent impingement until joint motion improves

Operative (after 12-16 weeks of failed non-operative treatment)

Closed manipulation under anesthesia (MUA) - well-established; axillary nerve at risk
Arthroscopic capsular release - selective or complete; recommended when MUA fails; carries the highest risk among equivalently effective options
Open capsular release - emphasis on release of CHL and reestablishment of the rotator interval; reserved for failures of arthroscopic release

Note: Diabetic patients have significantly worse outcomes - full ROM achieved in only 71% vs 90% in non-diabetics.

Prognosis & Natural History

Traditionally considered self-limited, lasting 12-18 months
~10% of patients have long-term problems
In a 10-year follow-up study of 83 patients: 94% recovered to normal function - but only ~44-51% were totally pain-free
Dominant shoulder involvement and earlier presentation both predict better outcomes
Best treatment of secondary frozen shoulder is prevention and early intervention

Recent Evidence (2024-2026)

Recent systematic reviews and meta-analyses have examined several treatment modalities:

A 2024 network meta-analysis (Rheumatology, PMID 38538951) evaluated pharmacological interventions for early-stage frozen shoulder.
A 2024 systematic review (PMID 39420459) confirmed that muscle energy and joint mobilization techniques improve ROM, pain, and function.
A 2024 meta-analysis (PMID 37559358) found that end-range interventions in physiotherapy are effective for primary adhesive capsulitis.

Sources:

Miller's Review of Orthopaedics 9th Edition
Campbell's Operative Orthopaedics 15th Ed 2026
Goldman-Cecil Medicine
Tintinalli's Emergency Medicine
Rheumatology, 2-Volume Set (2022, Elsevier)
Bailey and Love's Short Practice of Surgery 28th Edition

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