Frozen shoulder (adhesive capsulitis)

Frozen shoulder, or adhesive capsulitis, is inflammation and then contracture of the capsule surrounding the shoulder joint. As the capsule thickens and scars down, the ball can no longer rotate freely in the socket, so motion is lost in every direction — including when someone else moves your arm for you. That last detail is what distinguishes it from a rotator cuff problem, where the shoulder can usually be moved passively even when it is weak.

It typically moves through three overlapping phases: a freezing phase dominated by pain and progressive stiffness, a frozen phase where pain settles but motion is very limited, and a thawing phase where motion gradually returns.

The pattern is fairly characteristic, and often develops without any injury at all.

Many cases are primary, meaning no cause is identified. Frozen shoulder is substantially more common in people with diabetes and in thyroid disease, and is seen more often between the ages of 40 and 60.

Secondary cases follow a period of immobility or another shoulder problem: a rotator cuff tear or tendinitis, a fracture, surgery on the shoulder or breast, or time in a sling. Stiffness that develops during recovery from another injury is common and is one reason early, guided motion matters after shoulder surgery.

General guidance rather than individual medical advice: shoulder pain with progressive loss of motion that has lasted more than a few weeks deserves evaluation, particularly when it is waking you at night or when you have diabetes.

Evaluation also matters because several conditions imitate frozen shoulder — arthritis of the shoulder joint, a large rotator cuff tear, calcific tendinitis and, rarely, other causes of referred pain. The treatments differ meaningfully, so getting the diagnosis right early avoids months spent on the wrong program.

Diagnosis is primarily clinical. The examination compares active motion, which you produce, with passive motion, which is produced for you. Loss of passive external rotation with the arm at the side is the finding that most strongly supports adhesive capsulitis.

X-rays are obtained to rule out arthritis, a healed fracture or calcific deposits. MRI is not needed to make the diagnosis, but is used when the history or examination raises concern for a rotator cuff tear or another structural problem underneath the stiffness.

The great majority of frozen shoulders are treated without surgery, and the plan is matched to the phase. In the painful freezing phase, controlling inflammation comes first: an intra-articular corticosteroid injection, often ultrasound- or landmark-guided, paired with a gentle, pain-guided stretching program. Evidence supports this combination over stretching alone for early pain and motion.

As pain settles, the program becomes more assertive, working systematically on external rotation, elevation and internal rotation with a home routine performed several times daily. Consistency at home matters more than the number of clinic visits.

Anti-inflammatory medication, heat before stretching and attention to sleep positioning support the program. In diabetic patients, blood sugar is discussed as part of care, and the possibility of a longer, more resistant course is set out honestly at the start.

Intervention is considered when a shoulder remains stiff and functionally limiting after several months of appropriate treatment, when night pain persists despite injection, or when motion has plateaued well short of what daily life and work require.

There is no fixed deadline. Some shoulders continue improving steadily and are best left to keep improving; a shoulder that has stopped progressing is the one worth intervening on.

Two approaches are used, sometimes together, and both depend on immediate post-procedure therapy to keep the motion that is gained.

With non-operative care, improvement is measured over months rather than weeks. Pain generally settles before motion returns, and gains continue for as long as the stretching program is maintained.

After a release or manipulation, therapy starts essentially immediately and is frequent for the first several weeks — the window in which motion is either held or lost. Most patients see substantial functional motion within six to twelve weeks, with continued improvement beyond that.

Recurrence is uncommon but possible, and frozen shoulder can affect the opposite shoulder at a later date, especially in diabetic patients. These ranges are educational; your plan is individualized in the office.

Nolan Horner, MD is a board-certified orthopedic surgeon with shoulder and sports medicine fellowship training from Rush University Medical Center. Frozen shoulder is a condition where the main risk is being treated for the wrong diagnosis, or being pushed too hard at the wrong phase — both avoidable with a careful examination and a program that respects where you are in the process.

Most patients seen for this condition are treated without an operation, and that is said plainly at the first visit.

This page is general educational information, not individualized medical advice.