What frozen shoulder is: a shrinking joint capsule
The glenohumeral joint is a ball and socket: the head of the upper arm bone (humerus) rests in a shallow socket on the shoulder blade, the glenoid. A sleeve of ligament-like tissue, the joint capsule, surrounds it, with a loose fold underneath (the axillary pouch) that unfurls when you raise your arm.
In adhesive capsulitis the capsule becomes inflamed, then thick and contracted. The rotator interval and coracohumeral ligament at the front of the joint tighten first, so turning the arm outward is lost early. Despite the name, adhesions are not the main problem; the capsule itself shrinks.
Symptoms and the three phases
It usually starts without injury, as a deep ache over the outer upper arm, worse at night and when lying on that side. Stiffness follows, first in rotation: reaching a back pocket, fastening a bra, grabbing a seatbelt. The hallmark is lost active and passive motion; a clinician cannot move the arm much further than you can.
- Freezing (painful) phase, about 6 weeks to 9 months: pain dominates and motion shrinks.
- Frozen (stiff) phase, about 4 to 6 months: pain eases, but stiffness plateaus.
- Thawing phase, about 6 months to 2 years: motion gradually returns.
Causes and risk factors
Most cases have no clear trigger. Others follow immobility or irritation, such as an arm fracture, shoulder surgery, a stroke, or breast cancer surgery. Peak age is 40 to 60, and women are affected more often than men.
- Diabetes, type 1 or 2: roughly two to four times the risk, a longer, stiffer course, and more often both shoulders.
- Thyroid disease, underactive or overactive.
- Parkinson's disease, heart disease and Dupuytren's contracture.
How it is diagnosed
Diagnosis is mainly clinical. A shoulder exam at GoldPlayPot.com compares both sides:
X-rays are normal in frozen shoulder, and that is the point: they rule out glenohumeral arthritis, calcific tendinitis, a tumor, or a missed posterior dislocation, which also blocks outward rotation. MRI is reserved for an unclear picture, a suspected cuff tear, or surgical planning. HbA1c and TSH blood tests may be checked, since frozen shoulder can be the first clue to undiagnosed diabetes.
- Passive range of motion with a goniometer: forward flexion, abduction, and external rotation with the elbow at the side. Passive external rotation at half the other side or less is the key finding.
- Apley scratch test for internal rotation, recorded as the spinal level the thumb reaches.
- Active versus passive motion: equal loss points to the capsule, while a rotator cuff tear usually shows weak active lifting with near-normal passive motion.
- Cuff strength tests (Jobe empty can, external rotation lag sign, belly press) screen for a coexisting tear; Neer and Hawkins-Kennedy tests are often painful but not diagnostic.
- Coracoid pain test: pressure just below the front of the collarbone is clearly more tender than on the other side.
Non-surgical treatment comes first
Most people improve without surgery. Motion is rechecked every 6 to 12 weeks.
- Pain and sleep: ibuprofen or naproxen if your kidneys, stomach and medicines allow, heat before stretching, and a pillow under the arm at night.
- Corticosteroid injection into the glenohumeral joint, often ultrasound-guided. It eases pain most in the freezing phase, usually within days to two weeks, but does little to shorten the overall course. With diabetes, blood sugar runs higher for a few days.
- Physical therapy within pain limits: pendulum swings, table slides, cane-assisted external rotation and a towel stretch behind the back, held 15 to 30 seconds several times daily. Forcing through pain early causes flares; stretches get firmer as pain settles.
- Hydrodilatation if pain and stiffness persist after 2 to 3 months: under imaging guidance, saline, local anesthetic and steroid are injected to stretch the capsule, followed by therapy that week. Results vary.
When surgery is considered
Surgery is for persistent cases: typically 6 months or more of consistent care with little progress, and stiffness that still limits work, sleep or self-care. Both options are usually same-day.
Therapy starts within a day or two to keep the motion gained.
- Manipulation under anesthesia: the surgeon moves the arm through controlled arcs to stretch and tear the tight capsule. No incision, but small risks of fracture (higher with osteoporosis), dislocation, cuff tearing and nerve stretch.
- Arthroscopic capsular release: through two or three small incisions, instruments divide the tight rotator interval, coracohumeral ligament and capsule, protecting the axillary nerve below the joint.
Recovery timeline: honest ranges
A flat month in the frozen phase is common and not a sign of failure.
- Natural course: most people regain useful motion over 1 to 3 years; a sizable minority keep mild stiffness, but severe lasting limitation is uncommon.
- After an injection: pain relief within days to 2 weeks, strongest over 6 to 12 weeks.
- After arthroscopic release: therapy 2 to 3 times weekly for 6 to 12 weeks, most daily tasks by about 6 weeks, fuller recovery by 3 to 6 months.
Prevention and lowering recurrence risk
Primary frozen shoulder has no proven prevention, and recurrence in a fully thawed shoulder is uncommon. These steps help:
- Move the shoulder as soon as your surgeon allows after injury or surgery, and leave the sling when advised.
- Start guided shoulder motion early after a stroke or breast cancer surgery.
- Keep diabetes and thyroid disease controlled; poor glucose control is linked with a longer course.
- Get the other shoulder checked early if similar pain starts.
When to seek urgent care
Frozen shoulder is not an emergency, but some shoulder symptoms are.
Frequently asked questions
How long does frozen shoulder last?
Usually 1 to 3 years from first pain to near-normal motion, across the freezing, frozen and thawing phases. Diabetes often lengthens the course.
Will frozen shoulder go away on its own?
Usually, yes, but that can mean a year or more of pain and poor sleep. Some people keep mild stiffness that rarely limits daily life.
Does a cortisone shot help frozen shoulder?
Yes, for pain, especially in the early freezing phase, with relief usually within days to two weeks. It helps less once pain has settled.
Should I stretch through the pain?
Not in the freezing phase. Stretch to mild tension, hold 15 to 30 seconds, and stop at sharp pain to avoid flares.
Is frozen shoulder linked to diabetes?
Yes. It is roughly two to four times more common with diabetes, tends to last longer, and is also linked to thyroid disease.