Adhesive capsulitis (frozen shoulder)

Adhesive capsulitis (frozen shoulder) is a painful condition characterised by progressive restriction of active and passive glenohumeral range of motion due to fibrosis and contracture of the shoulder joint capsule. It affects approximately 2–5% of the general population, with peak incidence in adults aged 40–60 years, and is more common in women and individuals with diabetes mellitus. Adhesive capsulitis is a self-limiting condition in most patients, resolving over 1–3 years, though up to 40% of patients have residual symptoms or functional limitation. It follows a classic triphasic course: freezing (painful), frozen (stiff), and thawing (recovering). Understanding the phase at presentation guides appropriate management.

Adhesive capsulitis results from fibroblastic proliferation and capsular contracture of the glenohumeral joint, particularly the anterior capsule and rotator interval. The pathogenesis involves an initial inflammatory phase followed by fibrosis that is not directly related to ongoing inflammation.

Pathological Process

• Synovial inflammation — the initial phase involves synovial hyperplasia and inflammatory cell infiltration; mast cells and fibroblasts accumulate in the capsule; this drives the early painful phase with cytokine-mediated pain sensitisation
• Capsular fibrosis — transforming growth factor-β (TGF-β) drives myofibroblast differentiation and collagen deposition; the inferior glenohumeral ligament and rotator interval are primarily affected; progressive capsular contracture restricts joint volume from 20–30 mL to as little as 5–10 mL
• Rotator interval contracture — the rotator interval (between the supraspinatus and subscapularis tendons) contains the coracohumeral ligament and the superior glenohumeral ligament; contracture here preferentially restricts external rotation and forward flexion

Risk Factors

• Diabetes mellitus — up to 5 times higher risk than non-diabetic population; bilateral involvement more common; more refractory to treatment; poor glycaemic control is associated with worse outcomes; mechanism involves advanced glycation end-products stiffening collagen
• Thyroid disease — hypothyroidism and hyperthyroidism both associated; thyroid function testing warranted in bilateral adhesive capsulitis
• Immobilisation — post-operative or post-injury immobilisation (arm in sling) can precipitate adhesive capsulitis; early mobilisation after shoulder surgery is protective
• Secondary adhesive capsulitis — may occur after rotator cuff tear, glenohumeral OA, or Parkinson disease; differentiate from primary (idiopathic) capsulitis

Adhesive capsulitis presents with a characteristic pattern of shoulder pain and progressive loss of range of motion in a capsular pattern. The diagnosis is clinical; imaging is used to exclude other causes.

History

• Insidious onset — gradual onset of shoulder pain and stiffness; may follow minor trauma or period of immobilisation; often no clear precipitant; onset over weeks to months
• Night pain — characteristic; lying on the affected shoulder is impossible; nocturnal pain is most severe in the freezing phase; a prominent feature that drives patients to seek medical care
• Progressive loss of function — difficulty with overhead activities, reaching behind the back (fastening bra, tucking in shirt), and combing hair; functional impact is disproportionate to apparent severity
• Bilateral involvement — sequential bilateral adhesive capsulitis occurs in 10–20% of patients (not simultaneous bilateral); diabetes is a strong risk factor for bilateral disease

Examination Findings

• Capsular pattern of restriction — loss of passive movement in a specific pattern: external rotation > abduction > internal rotation; all directions are reduced; this distinguishes adhesive capsulitis from rotator cuff pathology (arc pain but full passive range)
• Equal active and passive restriction — both active and passive ranges are equally limited; this indicates intra-articular pathology rather than pain inhibition or rotator cuff weakness
• Normal rotator cuff power — within available range, resisted movement power is normal; this distinguishes from rotator cuff tear (pain and weakness in arc)
• Typical ranges in frozen phase — forward flexion 60–100° (normal 180°); external rotation <20° (normal 60–90°); internal rotation limited to buttock or sacrum (normal to thoracic spine)

Adhesive capsulitis is a clinical diagnosis. Investigations are directed at excluding other conditions, confirming the diagnosis in atypical presentations, and planning treatment.

• Essential
  X-ray shoulder (AP and axillary lateral)

  Mandatory at first presentation. Excludes glenohumeral OA, calcific tendinitis, posterior shoulder dislocation, and tumour. Usually normal in adhesive capsulitis (may show mild osteopenia from disuse). AP view: assess glenohumeral joint space, acromial shape, AC joint. Axillary lateral view: confirms glenohumeral joint alignment (critical to exclude posterior dislocation).
• Essential
  Blood glucose (fasting glucose or HbA1c)

  Undiagnosed diabetes mellitus is a common underlying factor in adhesive capsulitis. Fasting plasma glucose or HbA1c should be tested at diagnosis. Optimal glycaemic control improves treatment outcomes and reduces bilateral recurrence risk.
• Recommended
  Musculoskeletal ultrasound

  Identifies coracohumeral ligament thickening (>3 mm) and rotator interval thickening — characteristic ultrasound findings in adhesive capsulitis. Excludes rotator cuff tear (which may co-exist). Guides intra-articular injection. Not required if diagnosis is clear clinically.
• Recommended
  MRI shoulder (with or without contrast)

  For atypical presentations or if rotator cuff tear or labral pathology is suspected. Adhesive capsulitis shows thickened capsule and axillary recess, enhanced synovial tissue on contrast. MRI arthrogram demonstrates reduced joint volume. Not required routinely for typical adhesive capsulitis.
• Specialised
  Thyroid function tests

  Indicated in bilateral adhesive capsulitis, atypical age (<40 years), or if other features of thyroid disease present. Hypothyroidism and hyperthyroidism both associated with adhesive capsulitis.

Risk stratification in adhesive capsulitis is based on phase (freezing, frozen, thawing), severity of functional limitation, presence of diabetes, and response to initial treatment.

Pharmacological management of adhesive capsulitis is phase-dependent. Corticosteroid injection is the most effective treatment for the painful freezing phase. NSAIDs provide analgesia. Oral prednisolone short courses may be used in severe early-phase disease. No pharmacological agent alters the ultimate timeline of resolution.

Specific interventional and procedural treatments are available for adhesive capsulitis refractory to injection and physiotherapy.

Hydrodilatation (Distension Arthrography)

• Procedure — fluoroscopy or ultrasound-guided injection of saline (20–40 mL) and corticosteroid into the glenohumeral joint to distend and rupture the contracted capsule; performed by a radiologist; day procedure under local anaesthesia
• Evidence — improves pain and range of motion in the frozen phase; Cochrane review (Buchbinder 2008) showed hydrodilatation with corticosteroid superior to sham procedure for pain and function; most effective in the frozen phase when capsule is most contracted
• Post-procedure physiotherapy — immediate mobilisation and stretching after hydrodilatation is essential to maintain capsular distension; physiotherapy program begins within 24–48 hours; exercises focus on maintaining newly achieved range of motion
• PBS/Medicare — fluoroscopy-guided arthrogram (with steroid and saline) is Medicare-rebatable in Australia; typically performed at radiology centres

Surgical Options

• Manipulation under anaesthesia (MUA) — rarely required; reserved for treatment-refractory frozen phase (>12–18 months no improvement); risk of humeral fracture, labral tear, and brachial plexus injury; largely superseded by arthroscopic capsulotomy
• Arthroscopic capsulotomy — arthroscopic division of the contracted capsule and rotator interval; most effective surgical option; reserved for cases refractory to hydrodilatation and physiotherapy at 12+ months; excellent outcomes in diabetic patients refractory to conservative treatment

Physiotherapy Approach by Phase

• Freezing phase — gentle pendulum exercises; pain-free range of motion; avoid aggressive stretching which increases pain and inflammation; heat before, ice after exercise; primary goal is pain management, not range restoration
• Frozen phase — progressive capsular stretching; sustained end-range stretching (30–60 seconds); posterior capsule stretch (sleeper stretch); cross-body stretch for posterior capsule; active-assisted range of motion exercises
• Thawing phase — progressive strengthening; scapular stabilisation; return to full range activities; sport-specific rehabilitation if applicable

Non-pharmacological management is fundamental to adhesive capsulitis care and must be phase-appropriate. Physiotherapy is the primary long-term treatment; education and reassurance about the self-limiting nature of the condition are important to reduce patient anxiety.

Patient Education

• Self-limiting condition — reassure patients that adhesive capsulitis resolves in most cases within 1–3 years; up to 40% have mild residual symptoms; most regain full or near-full function; prognosis is generally good
• Phase-appropriate expectations — explain that aggressive stretching in the freezing phase worsens pain without improving stiffness; functional recovery occurs most rapidly in the thawing phase with active physiotherapy
• Diabetes management — optimise glycaemic control (target HbA1c <7%); poorly controlled diabetes prolongs the frozen phase and increases risk of bilateral involvement; referral to endocrinologist or diabetes educator if HbA1c elevated

Home Exercise Program

• Pendulum exercises — gravity-assisted distraction; patient bends forward and allows arm to hang; small circular or side-to-side movements; reduces capsular pressure and provides pain relief in freezing phase
• Towel stretch (internal rotation) — towel over shoulder; pull affected arm up the back with unaffected arm; sustained stretch 30–60 seconds; for frozen and thawing phases
• External rotation wall slide — elbow at 90° against wall; slide hand outward to increase external rotation; sustained stretch; primary mobility goal

Heat and Cold Therapy

• Heat before exercises — hot pack or warm shower on shoulder 10–15 minutes before stretching; increases tissue extensibility and reduces pain threshold; improves effectiveness of stretching program
• Ice after exercises — ice pack 10–15 minutes after exercise to reduce post-exercise pain; particularly useful in the freezing phase when movement provokes pain

Monitoring in adhesive capsulitis tracks phase progression, response to treatment, and identifies patients who require procedural escalation or specialist referral.

Indications for Specialist Referral

• No improvement after 2 corticosteroid injections and 3–6 months physiotherapy — refer for hydrodilatation (radiology) or orthopaedic review
• Diabetic patient refractory to standard treatment — earlier referral for hydrodilatation or arthroscopic capsulotomy; diabetic adhesive capsulitis is more refractory
• Atypical features (young patient, bilateral simultaneous, constitutional symptoms) — rheumatology referral to exclude inflammatory arthritis
• Suspected secondary adhesive capsulitis (post-rotator cuff tear, post-stroke) — orthopaedic review

Specific considerations apply to adhesive capsulitis in particular patient groups.

Diabetes Mellitus

• More severe and prolonged course — both type 1 and type 2 diabetes are associated with worse outcomes; longer frozen phase; higher rate of bilateral disease (up to 40%); more refractory to corticosteroid injection
• Glycaemic control — corticosteroid injections and oral prednisolone cause significant BSL elevation in diabetic patients (2–3 days of elevated BSL); inform and monitor; consider insulin adjustment; does not preclude injection use but requires awareness
• Arthroscopic capsulotomy — highly effective in diabetic patients refractory to conservative management; consider earlier surgical referral in diabetic patients not improving at 9–12 months

Post-Surgical Adhesive Capsulitis

• Occurs after shoulder surgery, mastectomy, or cardiac surgery — prolonged arm immobilisation is the primary risk factor; early mobilisation post-operatively is the best prevention
• Management same as idiopathic — intra-articular corticosteroid injection, physiotherapy, and hydrodilatation; coordinate with surgical team regarding rehabilitation restrictions

Bilateral Adhesive Capsulitis

• Sequential bilateral involvement in 10–20% — contralateral shoulder develops adhesive capsulitis 1–5 years after the first; simultaneous bilateral is rare and should prompt thyroid disease or systemic investigation
• Independent treatment of each shoulder — treat each side according to its current phase; the contralateral side does not always reach the same severity as the index shoulder

Stewardship in adhesive capsulitis focuses on phase-appropriate treatment, avoiding aggressive physiotherapy in the freezing phase, appropriate use of corticosteroid injections, and timely escalation to hydrodilatation in the frozen phase.

GP Role

• Phase-appropriate management — identify current phase and match treatment accordingly; inject in freezing phase, refer for hydrodilatation in frozen phase, progress physiotherapy in thawing phase
• Diabetes screening and management — HbA1c at diagnosis; optimise glycaemic control; warn of BSL elevation after corticosteroid injection; coordinate with endocrinologist if poor control
• Education and reassurance — adhesive capsulitis is self-limiting; most patients recover fully; set realistic timelines (12–24 months for full recovery); encourage compliance with home exercise program
• Timely referral — refer for hydrodilatation at 3–6 months if not improving; refer orthopaedics for diabetic patients refractory at 9–12 months

Adhesive capsulitis is self-limiting in most cases with resolution over 1–3 years. Active management accelerates functional recovery. Prevention focuses on early mobilisation after shoulder immobilisation and optimal diabetes management.

Prevention

• Early mobilisation after shoulder surgery — begin early range-of-motion exercises within 24–48 hours post-operatively; avoid prolonged sling immobilisation beyond what is clinically necessary
• Diabetes optimisation — maintain HbA1c <7%; reduces risk of adhesive capsulitis and bilateral recurrence; reduces severity and duration if it develops
• Contralateral shoulder awareness — educate patients who have had unilateral adhesive capsulitis about 10–20% risk of contralateral involvement; early presentation if symptoms develop in the other shoulder

• 01
  Buchbinder R, et al. Short course prednisolone for adhesive capsulitis (frozen shoulder or stiff painful shoulder): a randomised, double blind, placebo controlled trial. Ann Rheum Dis. 2004;63(11):1460–1469.
• 02
  Buchbinder R, et al. Hydrodilatation (distension arthrography) for adhesive capsulitis (frozen shoulder). Cochrane Database Syst Rev. 2008;(1):CD007005.
• 03
  Griggs SM, et al. Idiopathic adhesive capsulitis: a prospective functional outcome study of nonoperative treatment. J Bone Joint Surg Am. 2000;82-A(10):1398–1407.
• 04
  Rowe CR, Leffert RD. Idiopathic chronic adhesive capsulitis (frozen shoulder). In: The Shoulder. Churchill Livingstone; 1988.
• 05
  Therapeutic Guidelines. Rheumatology. Melbourne: Therapeutic Guidelines Ltd; 2024.
• 06
  Pharmaceutical Benefits Scheme (PBS). Schedule of Pharmaceutical Benefits. Canberra: Department of Health; 2025.