Frozen Shoulder (Adhesive Capsulitis): Phases and Effective Treatment

Frozen shoulder, properly called adhesive capsulitis, is a condition in which the capsule of the shoulder joint becomes inflamed, thickened and contracted — progressively restricting motion in all directions. It is one of the most frustrating conditions in orthopedic practice because patients often present after months of pain, the diagnosis is frequently delayed, and the natural course is long. The good news is that with the right treatment matched to the right phase of the disease, frozen shoulder is reliably treatable and the vast majority of patients regain full or near-full function. This article explains the phases, who gets it, and what works.

The three phases

Frozen shoulder follows a recognisable pattern over 12–24 months if untreated:

• Phase 1: Freezing (pain-predominant) — lasts 2–9 months. The shoulder is increasingly painful, particularly at night. Range starts to reduce. Sleep is disturbed.
• Phase 2: Frozen (stiffness-predominant) — lasts 4–12 months. Pain settles substantially. Stiffness dominates. Reaching behind the back, putting on a coat, brushing hair all become difficult or impossible.
• Phase 3: Thawing (resolution) — lasts 5–24 months. Range gradually returns. Most patients regain near-full function.

Treatment strategy depends entirely on which phase the patient is in.

Who gets frozen shoulder?

The classic patient is a woman aged 40–60. Risk factors include:

• Diabetes (frozen shoulder is much more common and often more stubborn in diabetics)
• Thyroid disease (under- and over-active)
• Recent immobilisation (after a fracture or stroke)
• Previous shoulder injury or surgery
• Idiopathic — no identifiable cause in many cases

Diagnosis

Frozen shoulder is a clinical diagnosis. The hallmark is loss of passive external rotation — the doctor cannot rotate your arm outwards while you relax. This distinguishes it from rotator cuff problems, where passive range is usually preserved. Imaging (X-ray and MRI) is usually normal apart from a slightly thickened capsule on MRI; we use imaging primarily to rule out other conditions.

Treatment in the freezing phase

The priority is pain control to allow sleep and engagement with rehab. The most effective intervention is an intra-articular cortisone injection — often combined with hydrodilatation, where a larger volume of fluid is infiltrated under image guidance to stretch the contracted capsule. NSAIDs, paracetamol, and gentle pendulum-style exercises within tolerance complete the package. Aggressive stretching during this phase often worsens pain and prolongs the freezing phase.

Treatment in the frozen phase

Once pain settles, the focus shifts to regaining motion. A structured physiotherapy programme — pulley exercises, wall climbs, table slides, capsular stretches — over 8–12 weeks is the foundation. A second injection is often helpful if pain returns. For stubborn cases, options escalate:

• Manipulation under anaesthesia — the shoulder is moved through full range while the patient is under general anaesthesia. Effective in selected patients; risk of fracture in elderly or osteoporotic bone.
• Arthroscopic capsular release — small portals to surgically release the thickened capsule and rotator interval. Highly effective in stubborn cases that have failed conservative management.

Treatment in the thawing phase

Most patients are improving without intervention by this point. Continued home exercise maintains the gains.

Diabetes and frozen shoulder

Diabetic frozen shoulder deserves a separate mention — it is more common, more stubborn, has a higher recurrence rate, and often involves both shoulders sequentially. Good glycaemic control during the rehab period correlates with better outcomes. Diabetic patients often need earlier escalation to manipulation or arthroscopic release.

What patients often get wrong

Three things commonly delay recovery: over-aggressive stretching during the painful phase (worsens inflammation), complete avoidance of the arm out of fear of pain (worsens stiffness), and stopping rehab the moment pain settles (the second phase still needs work). A structured programme tailored to phase makes a large difference.