The pattern usually starts with a dull ache in the shoulder — often worse at night, often there’s no clear injury that caused it. Over weeks the pain escalates. Then the stiffness sets in. Putting on a jacket becomes an ordeal. Reaching back for a seatbelt is sharp and limited. Sleeping on the affected side is impossible.
Frozen shoulder (adhesive capsulitis) is one of the most mismanaged conditions in musculoskeletal care — not because it’s hard to identify, but because the treatment that’s appropriate in one phase actively makes it worse in another. Understanding the phases matters more here than for almost any other shoulder condition.
What’s actually happening
The glenohumeral joint — the ball-and-socket joint of the shoulder — is surrounded by a capsule: a thick sleeve of connective tissue that holds the joint together and normally allows the wide range of movement the shoulder is designed for. In frozen shoulder, that capsule becomes inflamed and then progressively fibrotic — it contracts, thickens, and stiffens, mechanically reducing range of motion in every direction.
The restriction follows a characteristic pattern. External rotation goes first and loses the most range — the inability to rotate the arm outward is the most distinctive finding. Abduction and internal rotation follow. Because it’s the capsule that’s restricted (not a torn muscle or tendon), both active and passive movement are limited equally. This is the key clinical distinction: if your physio can move your shoulder passively to the same limit you reach on your own, the problem is capsular, not muscular.
The cause isn’t fully understood, but the condition is strongly associated with diabetes (three to five times increased risk), thyroid conditions, Dupuytren’s contracture, and occasionally follows shoulder surgery or prolonged immobilisation. It’s most common in women aged 40–60, though it affects men too. In most cases there is no clear trigger — it starts insidiously.
The three phases — and why they change everything
Frozen shoulder follows a predictable natural history across three phases. The total course is typically 12–24 months. This is not a comfortable thing to hear — but it’s important to know, because it means the condition is usually self-limiting (most people do recover), and it also means treatment needs to be matched to the phase rather than applied uniformly throughout.
Phase 1: Freezing (roughly 2–9 months)
Pain is the dominant feature. Range of motion begins to decrease, but the stiffness is not yet at its worst. The capsule is in an active inflammatory state — it’s hot, irritable, and progressively tightening.
This is the phase where aggressive treatment does the most harm. Forceful stretching of an acutely inflamed capsule increases inflammation, drives more fibrosis, and accelerates the contraction. It feels like you should be pushing through the pain to maintain range — the instinct is understandable — but it’s counterproductive.
What actually helps in the freezing phase:
- Education about the natural history— understanding what’s happening and that recovery is expected reduces the distress and the urge to aggressively force range that isn’t available yet
- Gentle movement within pain limits — keeping the shoulder moving at the end of its available range without provoking a flare; pendulum exercises and assisted movements in pain-free or low-pain range
- Pain management— anti-inflammatories and, for severe presentations, a corticosteroid injection into the joint. An intra-articular injection in the freezing phase is one of the most consistently effective short-term interventions — it doesn’t stop the condition progressing, but it significantly reduces pain and can shorten the duration of the phase
- Posture and sleep position management — reducing the sustained compression on the shoulder during sleep, which is often when pain is worst
Phase 2: Frozen (roughly 4–12 months)
Pain begins to decrease but stiffness is at its maximum. Range of motion has plateaued at its most restricted point. This is the phase where the capsule has fibrosed and the primary problem is mechanical — the tissue is tight and contracted, not acutely inflamed.
This is where more active physical treatment is appropriate:
- Capsular stretching — progressive stretching of the contracted capsule, particularly in the directions most limited (external rotation, cross-body adduction for the posterior capsule). These should be sustained, low-load stretches — not aggressive forcing.
- Joint mobilisation— hands-on movement of the humeral head in the socket, targeting the specific capsular directions that are restricted. Caudal (downward) glides, posterior glides, and anterior glides applied by a physio progressively restore joint play that stretching alone can’t recover.
- Strengthening through available range — the muscles around the shoulder weaken significantly over the frozen phase from disuse. Building strength through whatever range is available is important for functional recovery and prepares the joint for the thawing phase.
- Hydrodilatation (arthrographic distension) — for severe, non-progressing frozen phase presentations, an interventional radiologist injects saline and sometimes corticosteroid directly into the joint under imaging guidance, stretching the capsule from within. This produces meaningful range gain in selected patients and can accelerate the transition to the thawing phase.
Phase 3: Thawing (roughly 5–24 months)
Range of motion gradually returns on its own. The capsule remodels, pain continues to reduce, and function progressively improves. Most people regain full or near-full range — though it can take years, and a small proportion are left with some residual restriction.
Treatment in the thawing phase shifts to progressive strengthening and functional rehabilitation — rebuilding the strength, coordination, and confidence in the shoulder that was lost over the preceding year or more. The gains that couldn’t be achieved in the frozen phase become available now.
What manual therapy actually does
Hands-on joint mobilisation is the most specific treatment for the mechanical restriction in frozen shoulder — it targets the capsular stiffness directly in a way stretching exercises can’t replicate. The joint surfaces need to glide in specific directions to allow rotation and elevation; when the capsule is contracted on one side, that glide is blocked. Mobilisation techniques restore the accessory joint movement that makes full range possible.
This is most appropriate in the frozen and thawing phases, when the capsule is fibrotic rather than acutely inflamed. In the freezing phase, mobilisation needs to be gentler and more symptom-guided — the goal is maintaining what range exists rather than forcing through an actively irritable capsule.
Manual therapy for frozen shoulder is best understood as a phase-appropriate adjunct to exercise, not a standalone treatment. The combination of mobilisation plus progressive exercise produces better outcomes than either alone. More on how manual therapy works →
When to consider interventions beyond physio
Corticosteroid injection
Most useful in the freezing phase, when pain is severe and limiting sleep and function. It reduces inflammation, takes the edge off pain quickly, and makes physio treatment more tolerable. It doesn’t change the eventual outcome but shortens the most difficult part of the course. One or two injections are typically used; more than that has diminishing returns.
Hydrodilatation
A reasonable option for the frozen phase when range isn’t progressing with conservative management. The evidence supports moderate benefit — meaningful for a significant proportion of patients with severe restriction.
Manipulation under anaesthesia (MUA)
Reserved for refractory cases — typically a year or more into the condition with no meaningful progress. The joint is manipulated to break up capsular adhesions while the patient is under general anaesthesia. Evidence quality is lower than for the interventions above, but it has a role in cases where everything else has failed.
Arthroscopic capsular release
Surgery as a last resort, after exhaustive conservative management (at minimum six to twelve months). The contracted capsule is released surgically under arthroscopy. It’s effective but comes with surgical recovery and carries all the risks of any shoulder procedure. Most people don’t need it — the condition resolves with time and appropriate conservative management.
The diabetic shoulder
If you have diabetes and frozen shoulder, your prognosis is different and worth knowing upfront. Diabetic patients are three to five times more likely to develop frozen shoulder, tend to have more severe restriction, take longer to resolve, and are more likely to have bilateral involvement (the condition developing in both shoulders, often sequentially). Blood sugar management is part of the treatment — poorly controlled diabetes slows capsular remodelling. Expectations around timeline need to be adjusted, and the threshold for more aggressive intervention (injection, hydrodilatation) is lower.
The honest timeline
Most people ask: how long will this take? The honest answer is 12–24 months for the full natural history to run its course. Treatment doesn’t reset that clock — it manages symptoms, maintains function, and in some cases shortens phases. The freezing and frozen phases are the hardest. The thawing phase is when the body does most of the recovery work.
The most important thing to understand is that this is a self-limiting condition — it ends. For people in the depths of the freezing phase, that’s not always reassuring in the moment, but it’s clinically important. Treatment is about getting through the phases with less pain, maintaining as much function as possible, and being positioned to recover range as the thawing phase begins — not about fighting the condition into submission.