Frozen Shoulder Physical Therapy

The Three Stages of Frozen Shoulder

Frozen shoulder — adhesive capsulitis — follows a predictable pattern. The shoulder joint capsule becomes inflamed, thickened, and contracted. The progression unfolds in three overlapping stages:

The right treatment at the right stage matters more in frozen shoulder than in almost any other musculoskeletal condition. The biology of each phase is different, and the intervention must match.

What Shortens the Timeline

The most common mistake in frozen shoulder treatment is aggressive stretching during the freezing stage. The capsule is inflamed. Forcing range of motion into an acutely inflamed structure increases pain, increases guarding, and may prolong the inflammatory phase. The 2013 JOSPT clinical practice guidelines for adhesive capsulitis are clear on this point: high-intensity stretching in the early stages is contraindicated.

Here is what the evidence supports at each stage:

Freezing stage

• Gentle range of motion within pain tolerance — not forcing through pain
• Manual therapy to reduce guarding and maintain available range
• Pain management — positioning, activity modification, sleep strategies
• Structured aerobic conditioning at ventilatory threshold to reduce central pain sensitivity
• Education — understanding the timeline reduces anxiety and improves adherence

Frozen stage

• Progressive joint mobilization targeting the contracted capsule
• End-range loading — sustained stretches, contract-relax techniques, low-load long-duration positioning
• Manual therapy intensity increases as pain allows
• Active range of motion exercises pushing into stiffness, not pain

Thawing stage

• Progressive strengthening — muscles that have been inactive for months need to be rebuilt
• Functional retraining — reaching overhead, behind the back, and across the body under load
• Capsular mobilization to address residual end-range restrictions
• Return to full activity, gym, sport, or occupational demands

Reference: Kelley MJ et al. Shoulder pain and mobility deficits: adhesive capsulitis. JOSPT 2013;43(5):A1-A31

Who Gets Frozen Shoulder?

Frozen shoulder is not random. Certain populations are at significantly higher risk, and understanding these risk factors changes both the prevention strategy and the treatment approach.

• Diabetes mellitus — the strongest modifiable risk factor. Patients with diabetes are 2 to 4 times more likely to develop frozen shoulder, and their cases tend to be more severe and longer-lasting. Both Type 1 and Type 2 diabetes increase risk. Elevated blood glucose is believed to drive glycosylation of collagen in the joint capsule, making it stiffer and more susceptible to adhesion formation.
• Thyroid disorders — both hypothyroidism and hyperthyroidism are associated with increased frozen shoulder incidence
• Women aged 40-60 — the demographic most commonly affected, though the condition can occur in anyone
• Post-surgical immobilization — any period of shoulder immobility (rotator cuff repair, fracture, cardiac surgery, breast surgery) increases the risk of secondary adhesive capsulitis
• Dupuytren’s contracture — the connective tissue disorder that causes finger contractures is associated with a higher rate of frozen shoulder, suggesting a shared fibroproliferative mechanism
• Cardiovascular disease and stroke — post-stroke shoulder stiffness shares overlapping mechanisms with adhesive capsulitis

Reference: Zreik NH et al. Adhesive capsulitis of the shoulder and diabetes: a meta-analysis of prevalence. Muscles Ligaments Tendons J. 2016;6(1):26-34

The Whole Person

Frozen shoulder does not exist in isolation. The condition interacts with metabolic health, sleep, stress, and deconditioning in ways that directly affect how long it lasts and how completely it resolves.

Diabetes and blood glucose. Elevated blood glucose is not just a risk factor for developing frozen shoulder — it affects the biology of the capsule throughout the entire course of the condition. High glucose levels promote non-enzymatic glycosylation of collagen, making capsular tissue stiffer and more resistant to mobilization. For patients with diabetes or prediabetes, managing blood glucose is a direct intervention for frozen shoulder. Structured aerobic exercise at the right intensity is one of the most effective ways to lower resting blood glucose — which means the aerobic training we prescribe is treating the metabolic environment that contributed to the condition in the first place.

Sleep disruption. Night pain is one of the hallmark symptoms of the freezing stage. Patients cannot sleep on the affected side, frequently wake in pain, and develop chronic sleep deprivation. Poor sleep increases pain sensitivity, impairs tissue healing, and worsens mood. Addressing sleep positioning — pillow support, arm positioning, avoiding the affected side — is a meaningful part of early-stage management.

Deconditioning. Months of limited shoulder use leads to broader physical deconditioning. Patients stop exercising. Cardiovascular fitness declines. Pain sensitivity increases. The shoulder is not the only thing that gets worse — the whole system degrades. This is preventable with early aerobic training using equipment that does not aggravate the shoulder.

Stress and pain sensitization. Chronic pain changes the nervous system. In frozen shoulder, months of ongoing pain and disrupted sleep can drive central sensitization — where the nervous system amplifies pain signals beyond what the tissue pathology explains. Movements that should be tolerable become painful. Pain spreads beyond the shoulder. Recognizing central sensitization changes the treatment approach and is one of the reasons aerobic conditioning at threshold is so important — it directly modulates the central nervous system.

Aerobic Conditioning

Most frozen shoulder patients are deconditioned by the time they start physical therapy — not because they were inactive before, but because they stopped moving when it started hurting. The gym stopped. Swimming stopped. And three months later, cardiovascular fitness has declined, pain sensitivity has increased, and the shoulder is not the only thing that feels worse.

We test ventilatory thresholds (VT1 and VT2) to determine exactly where to set training intensity. VT1 is the point where breathing picks up and sustained conversation becomes difficult. VT2 is the point where conversation is no longer possible. These thresholds are unique to each patient and depend on current fitness, age, and health history.

During the freezing phase, when the shoulder itself is too irritable for aggressive range of motion work, aerobic training is one of the most valuable things you can do. We use equipment that does not aggravate an acute shoulder — stationary bike, rower, inclined treadmill walk, ski erg. The modality matters less than the intensity. A flat walk at a comfortable pace will not reach VT1 for most people. We need you at threshold.

Aerobic exercise at or above VT1 produces exercise-induced hypoalgesia — a measurable reduction in pain sensitivity that occurs during and after sustained cardiovascular effort. This is not a theory. It is a well-documented physiological response that directly benefits frozen shoulder patients. For patients with central sensitization from months of pain and disrupted sleep, repeated threshold-level exercise progressively restores normal pain modulation.

And for patients with diabetes or prediabetes, threshold-level aerobic training directly lowers resting blood glucose — treating the metabolic environment that drives capsular stiffness.

Conditioning is part of your frozen shoulder rehab. Not a suggestion. Part of the plan.
Ventilatory threshold testing →

What About Injections?

Corticosteroid injections can provide meaningful short-term pain relief during the freezing stage — typically 4 to 8 weeks of reduced pain and improved sleep. The Cochrane review by Buchbinder et al. (2003) found that intra-articular corticosteroid injections produced short-term benefits in pain and range of motion for adhesive capsulitis, but the effects diminished over time and did not change long-term outcomes.

Hydrodilatation (distension arthrography) is another injection-based approach. Saline is injected under pressure to stretch the contracted capsule. Some studies show short-term improvements in range of motion. It is most commonly used during the frozen stage when mechanical restriction is the primary problem.

We are not anti-injection. There is a legitimate role for pain relief — particularly when pain is so severe that a patient cannot participate in rehab or sleep. But injection without rehab is incomplete. It treats the symptom, not the problem. And if the underlying capsular restriction and deconditioning are not addressed, the pain and stiffness return.

Reference: Buchbinder R et al. Arthrographic distension for adhesive capsulitis (frozen shoulder). Cochrane Database Syst Rev. 2003;(2):CD004016

If Surgery Becomes Necessary

The vast majority of frozen shoulder cases resolve without surgery. For the rare cases that do not respond to months of quality conservative care, surgical options exist — but success rates are modest and post-operative rehab is critical. If surgery becomes the right path, we refer to the surgeon we believe gives the best outcome. We are independently owned — no hospital system influencing our referrals.