Frozen Shoulder: The Three Phases No One Explains

The pathological basis of the condition begins with an initial synovitis of the glenohumeral capsule, followed by fibroblastic and myofibroblastic proliferation, deposition of type III collagen, and progressive contracture of the capsuloligamentous complex. The structures primarily affected are the rotator interval, the coracohumeral ligament, and the anterior-inferior axillary fold of the capsule. The resulting capsular thickening and contracture produce a mechanical restriction of arthrokinematic glide that is independent of muscle strength or the patient's effort. A pathognomonic clinical sign is the loss of passive external rotation in adduction, which distinguishes adhesive capsulitis from rotator cuff pathology and glenohumeral osteoarthritis.

Adhesive capsulitis affects approximately 2–5% of the general population, with peak incidence between the fourth and sixth decades of life and a female-to-male ratio of roughly 2:1. Documented risk factors include:

• Diabetes mellitus — the strongest systemic association; prevalence in diabetic patients frequently exceeds 20%, while poor glycaemic control is linked to a prolonged disease course and a reduced response to treatment.

• Thyroid dysfunction — both hypothyroidism and hyperthyroidism are associated with increased incidence.

• Prolonged immobilisation following fracture, surgery, stroke, or extended use of a sling.

• Pre-existing shoulder pathology, such as rotator cuff tendinopathy, calcific tendinitis, and post-traumatic stiffness.

• Idiopathic onset — a subgroup of cases presents without any identifiable triggering factor.

The natural course of adhesive capsulitis is divided into three successive phases. Identifying the current stage is fundamental, as therapeutic interventions appropriate for one stage may be harmful in another.

The first stage is dominated by acute synovitis. Patients report a constant, deep, non-radicular shoulder pain with severe nocturnal exacerbation that typically prevents lying on the affected side. The restriction of range is due primarily to pain rather than to a mechanical block; the end-feel of movement remains soft. Aggressive end-range stretching is contraindicated during this phase, as the mechanically irritating loading of the inflamed synovium prolongs the inflammatory process and intensifies symptoms.

Management of this phase prioritises pain relief and joint protection. Appropriate interventions include pharmacological analgesia under medical supervision, pain-free pendulum exercises (Codman), myofascial release of the compensatory cervical and peri-scapular muscles, the targeted application of cryotherapy or superficial heat therapy according to tissue response, education on sleeping position and ergonomics, as well as structured patient education about the natural course of the condition.

Inflammatory pain subsides as fibrotic capsular contracture becomes the dominant pathology. The end-feel of movement becomes capsular and firm. The clinical picture consists of mechanical restriction in a characteristic capsular pattern, with maximal loss in external rotation, followed by abduction and then internal rotation.

It is in this phase that manual therapy demonstrates its greatest clinical value. Treatment focuses on restoring arthrokinematic glide through grade III–IV joint mobilisation (Maitland and Kaltenborn), with the direction of glide selected according to the affected plane: posterior glide for restricted internal rotation, inferior glide for restricted abduction, and anterior glide for restricted external rotation. These are complemented by end-range capsular stretching, active-assisted and active mobilisation, as well as ongoing myofascial release of the compensatorily hypertonic muscles.

Range of motion returns gradually, with external rotation typically being the last to recover. The months of inactivity lead to measurable atrophy of the rotator cuff and the scapular stabilisers, while protective movement patterns must be deliberately reversed. Treatment in this phase focuses on progressive isometric and subsequently isotonic strengthening of the rotator cuff, neuromuscular re-education of the scapulothoracic joint, a gradual increase in resistance within the regained range, and re-training in functional activities. Patients who skip this phase often retain full passive range but exhibit persistent functional deficits and reduced confidence in using the shoulder.

A comprehensive programme for adhesive capsulitis is not a generic shoulder rehabilitation protocol. The selection and dosage of therapeutic modalities differ significantly from stage to stage. The clinician specialised in manual therapy and musculoskeletal rehabilitation selects the appropriate modalities through clinical reasoning:

Specialised mobilisation of the glenohumeral joint, targeting the contracted capsule, is the cornerstone of treatment during the fibrotic phase. Different glide directions target different capsular restrictions, in accordance with the concave-convex rule. This is precise, joint-specific manual therapy, not generalised muscle work.

By the time the patient enters Stage 2, the upper trapezius, levator scapulae, pectoralis minor, and posterior rotator cuff have developed compensatory hypertonia and active myofascial trigger points. Releasing these structures restores the scapulothoracic base on which arthrokinematic movement depends.

Pendulum exercises in Stage 1; active-assisted mobilisation at the end of Stage 1 and into Stage 2; end-range capsular stretching in Stage 2 once tissue tolerance allows. Each exercise is dosed according to the stage and the irritability of the tissue, rather than the patient's subjective "effort."

Adhesive capsulitis rarely presents in isolation. The scapula typically shows elevation, anterior tilt, and downward rotation. Re-educating a normal scapulohumeral rhythm offloads the glenohumeral joint and supports recovery.

Reserved for Stage 3. First isometric work, then light isotonic resistance within the regained range, and finally compound loading movements once range and neuromuscular control are reliable. The rotator cuff almost always requires targeted re-conditioning after months of protective inhibition.

Patients in Stage 1 often experience prolonged sleep disturbance. Guidance on sleeping position, pillow arrangement, and gentle mobilisation before bedtime frequently brings about the single greatest improvement in quality of life during the first weeks of management.

• Aggressive end-range stretching in Stage 1. The mechanically irritating loading of the inflamed synovium intensifies inflammation and prolongs the painful phase.

• Complete immobilisation in the name of "rest." Prolonged immobility accelerates capsular fibrosis and must be avoided.

• Generic, non-staged shoulder protocols. Exercises chosen indiscriminately fail to account for the current stage and are often inappropriate for at least one phase.

• Premature cessation of rehabilitation. Once passive range is regained, patients often discontinue treatment, skipping the strengthening and neuromuscular re-education that prevent residual dysfunction.

• Inadequate glycaemic control in diabetic patients. Hyperglycaemia is associated with a prolonged course; coordination with the treating physician is recommended.

Any shoulder pain that disrupts sleep for more than two consecutive weeks, or any shoulder showing a measurable loss in both passive and active range, warrants clinical assessment. Adhesive capsulitis is a clinical diagnosis; an experienced clinician can usually recognise it in a single examination by the characteristic capsular pattern of restriction, with external rotation typically the first and most severely affected movement.

Assessment also serves to rule out differential diagnoses, such as rotator cuff tear, calcific tendinopathy, glenohumeral osteoarthritis, cervical radiculopathy, and glenohumeral instability. Each requires a different therapeutic approach. Imaging (X-ray, ultrasound, or MRI) and medical evaluation are requested when the clinical picture is atypical or when a different pathology is suspected.

Adhesive capsulitis carries a significant functional and psychological burden. The months of disturbed sleep, the dependence on help for activities of daily living, and the frequent reassurance that the condition is "self-limiting" are exhausting. Family members offer meaningful support through practical help with activities that require movement overhead or behind the back, transport to appointments, encouragement to comply with the home exercise programme, and tolerance of the non-linear, day-to-day fluctuation in symptoms. Recovery is not linear, and symptom-free intervals do not mean a cure.

At PhysioDanali, adhesive capsulitis is treated with a stage-specific protocol: manual joint mobilisation, dosed progression of exercises, pain and sleep education, and progressive re-conditioning, tailored to the current clinical stage rather than to a generic timeline. We treat patients in Voula, Glyfada, and Vouliagmeni, both at the clinic and at home.

If you are experiencing persistent nocturnal shoulder pain or an inability to move your arm behind your back, early intervention is advised. Beginning stage-specific physiotherapy during Phase 1 reduces the duration of the painful phase and limits the severity of the subsequent capsular contracture.

Call PhysioDanali today to book an adhesive capsulitis assessment.

This article is for informational purposes and does not replace medical assessment. Adhesive capsulitis is a clinical diagnosis that may coexist with or mimic other shoulder pathologies; an in-person physiotherapy assessment, combined where indicated with imaging and medical investigation, is the proper way to confirm the diagnosis and stage.