Frozen Shoulder in BC: The Three Stages, the Real Timeline, and What Physio Can and Can't Do

Frozen shoulder — clinically, adhesive capsulitis — is one of the orthopaedic conditions we most often see treated the wrong way before someone arrives in clinic. The reason isn't lack of effort. Most people with a stiff, painful shoulder reasonably assume it's a tight muscle problem and start stretching. With frozen shoulder, that assumption is exactly the trap. Aggressive stretching in the wrong stage feeds the inflammation that drives the condition and lengthens the whole timeline.

This post explains what frozen shoulder actually is, the three stages it moves through, and what a physiotherapist does — and notably, does not do — at each stage. The goal isn't to rush the timeline. It's to keep the shoulder functioning as well as possible at every point along the way, and to avoid the long plateau that happens when the wrong things were done in the wrong stage.

What frozen shoulder is

Adhesive capsulitis is an inflammatory and fibrotic condition of the glenohumeral joint capsule — the dense connective-tissue sleeve that surrounds the shoulder ball-and-socket joint. The capsule becomes inflamed, thickened, and progressively contracts, particularly in its anterior and inferior regions. The result is a shoulder that loses range of motion in a specific, characteristic pattern: external rotation is lost first and most severely, followed by abduction, then internal rotation. This pattern — called a capsular pattern — is one of the cleanest clinical signs in orthopaedics.

The cause is not fully settled in the literature. Frozen shoulder can be primary (idiopathic — no identifiable trigger) or secondary (following an injury, surgery, or period of immobilization). It is more common in people aged 40 to 60, more common in women, and substantially more common in people with diabetes, thyroid dysfunction, or after a period of arm immobilization for any reason. The 2024 Clinical Practice Guidelines from JOSPT summarize the current evidence base and treatment recommendations.

What frozen shoulder is not:

• A rotator cuff tear (though it can coexist with one).
• A stiff trap, levator, or pec causing referred pain.
• Something that responds well to aggressive stretching in its early phase.
• A condition that resolves in 6 weeks of physiotherapy.

The misdiagnosis tax is the biggest cost in this condition. People often spend the first 3 to 6 months being treated as if they have a soft-tissue tightness problem, get worse, and only then receive the right diagnosis. By the time they arrive at the right treatment, they're already several months into a 12-to-24-month arc.

The three stages

Frozen shoulder progresses through three overlapping stages. The stages are real and clinically useful — they are what determines what we do.

Stage 1 — Freezing (typically months 0–6, sometimes longer)

The freezing stage is the inflammatory phase. The defining feature is pain, often severe, often worse at night, often disproportionate to whatever activity preceded it. Range of motion is starting to decrease but pain dominates the clinical picture. Patients commonly describe a sharp, deep, burning pain when the arm moves into end-range — particularly when reaching behind the back, putting on a seatbelt, or sleeping on the affected side.

The key clinical reality of the freezing stage is that the capsule is actively inflamed. Stretching an actively inflamed capsule does not lengthen it — it provokes more inflammation. This is the mechanism behind the common pattern where someone "stretches harder" and the shoulder gets worse. The literature on this is consistent: in the freezing stage, the treatment priorities are pain modulation, gentle pain-free movement, and education on flare management. Not end-range stretching.

What a physiotherapist does in stage 1:

• Pain modulation: gentle joint mobilization within the comfort zone, soft-tissue work to the surrounding musculature (which is reactively guarding), and modalities like heat or TENS if they help symptom control.
• Pain-free range work: small, gentle pendulum movements, table slides, and short-lever isometrics to keep the muscles around the shoulder active without provoking the capsule.
• Sleep positioning: practical strategies — pillow under the affected arm to support it at neutral, sleeping on the opposite side with the affected arm pillowed.
• Education: setting the timeline expectation honestly. This will take longer than you want it to. The goal of stage 1 is not to "fix" the shoulder — it's to keep it from getting worse.

The conversation in stage 1 is often the most important part of the visit. People arrive frustrated that 8 weeks of stretching hasn't helped. Understanding why — that the stretching was the wrong intervention for the stage — changes both the treatment plan and the trajectory.

Stage 2 — Frozen (typically months 6–12)

The frozen stage is the fibrotic, stiff phase. Pain settles. Range of motion is now severely limited. The capsule has thickened and shortened. Reaching overhead, behind the back, and across the body are all restricted. Activities of daily living — doing up a bra, reaching a back pocket, putting on a coat — are the limitations people report.

This is the stage where stretching and mobilization actually do their work. The capsule is no longer in active inflammation; it is in a fibrotic state where graded mechanical input promotes remodelling. The treatment shifts from protective to progressive.

What a physiotherapist does in stage 2:

• Graded joint mobilization: low-grade and progressively higher-grade glenohumeral mobilizations targeting the restricted directions, particularly inferior and posterior glide.
• Stretching: now appropriate. End-range stretches held for sustained durations, performed daily as a home program.
• Active range exercises: wall walks, towel slides behind the back, doorway external rotation stretches.
• Strength work for the surrounding musculature: scapular stabilizers, rotator cuff, and posterior chain. The shoulder doesn't move in isolation. A frozen shoulder that has lost 6 months of normal use has weakened the entire shoulder-girdle complex.

Pain in stage 2 should be tolerable. If a stretch consistently provokes night pain or a flare for hours afterward, the dosage is too aggressive. The principle is graded progressive loading — not heroics.

Stage 3 — Thawing (typically months 12–24)

The thawing stage is the recovery phase. Range of motion returns, generally in the same order it was lost — internal rotation first, then abduction, then external rotation. The recovery is rarely 100 percent. The literature suggests most people regain functional range but may have a small residual deficit in end-range external rotation that is clinically inconsequential.

What a physiotherapist does in stage 3:

• Strength work, expanded: this is where rebuilding pays the most dividends. Strength predicts whether the shoulder fully recovers or plateaus at 70–80 percent of function. We progress through bodyweight to band to dumbbell to compound lifts, depending on the patient's goals.
• Return-to-activity work: specific to what the person needs to do — overhead reaching at work, sports return, lifting children, etc.
• Maintenance education: how to keep range without obsessive stretching, and what to do if there's a flare.

The timeline question — and what we can't change

Most frozen shoulders run 12 to 24 months from onset to functional recovery. This is the consistent finding across the longitudinal literature. Physiotherapy does not shorten the total timeline by months. What it changes is the function level at every point on the timeline — and whether the recovery plateaus or completes.

This is the honest conversation worth having early. People come in hoping the right treatment will compress 18 months into 8 weeks. It won't. What it will do is keep the shoulder functioning during the freezing stage so daily life is bearable, prevent the muscle deconditioning that often makes the frozen stage worse, and rebuild the strength that determines whether the thawing stage ends in full recovery or a long-term limitation.

Surgical and injection options exist for cases that aren't progressing — intra-articular corticosteroid injections, hydrodilatation, and manipulation under anesthesia or capsular release for severe persistent cases. These are options to discuss with a physician when conservative care has stalled, not first-line treatments. Most frozen shoulders resolve without them.

When something else is going on

Frozen shoulder is a clinical diagnosis based on history and the capsular pattern of motion loss. If the presentation doesn't fit — pain without progressive stiffness, weakness without range loss, a specific traumatic mechanism — the diagnosis is probably something else. Common imitators include:

• Rotator cuff pathology: presents as weakness and pain with specific movements, not the capsular pattern.
• Subacromial impingement: painful arc through mid-range, full external rotation usually preserved.
• Glenohumeral arthritis: often coexists; may show on imaging.
• Cervical referral: neck-driven shoulder pain that doesn't match a shoulder examination.

If you've been treated for frozen shoulder for several months without improvement and the clinical picture doesn't match the staged arc above, a re-assessment is worth requesting. We commonly see referred neck pain misclassified as frozen shoulder and vice versa.

Where this connects

If shoulder pain is part of a larger neck-and-upper-back picture after a motor vehicle crash, our ICBC physio guide covers how the coverage side works in BC. If you're not sure whether a chiropractor or physiotherapist is the right starting point for shoulder pain, the physio vs chiro vs RMT piece has the scope breakdown. And if shoulder stiffness is showing up with dizziness or balance changes, the vestibular vs cervicogenic piece is the place to start.

The shortest version of all of this: frozen shoulder is a real, staged, predictable condition. It does not respond well to a one-size-fits-all stretching protocol. The right physiotherapy depends on which stage you're in. Get the staging right, and the recovery is much more comfortable than the literature alone would suggest.