What Is Frozen Shoulder?
Frozen shoulder (adhesive capsulitis) is a less common source of shoulder pain, affecting around 3% of adults — a rate that climbs to as high as 40% in patients with diabetes or thyroid disorders. It typically develops between ages 40 and 65 and affects women more than men. In the early stages, an acute inflammatory process in the joint’s synovial membrane and capsule can make frozen shoulder extremely painful before it transitions into capsular fibrosis and a progressive loss of range of motion.
Frozen shoulder can be frustratingly slow to resolve, with recovery sometimes taking one to two years from onset. Corticosteroid injections from a physician and physical therapy have both been shown to reduce symptoms and shorten recovery time when used at the appropriate stage — injections earlier, physical therapy as the condition progresses. A combination of spinal and shoulder manual therapy, along with mobility and strengthening exercise, tends to be the most effective conservative approach. Surgery and manipulation under anesthesia (MUA) are sometimes suggested for patients who don’t respond to conservative treatment.
The Research: MUA vs. Surgery vs. Physical Therapy
Rangan and colleagues published a large randomized controlled trial in The Lancet (2020) comparing three treatment paths for frozen shoulder: arthroscopic capsular release, manipulation under anesthesia, and physical therapy. 503 patients were randomized across the three groups, with outcomes tracked over 12 months using the Oxford Shoulder Score.
The result: no significant difference in outcomes between the three treatment groups. What did differ was risk. Researchers reported 8 serious adverse events in the surgery group and 2 in the MUA group, against a far lower risk profile for physical therapy. When three approaches produce comparable results, the one with the lowest risk of a serious complication is the reasonable place to start.
Shoulder Manipulation Isn’t the Same as MUA
It’s worth being specific about terms here, because “manipulation” shows up in both a conservative and a surgical context and the two aren’t interchangeable. MUA involves placing a patient under anesthesia and forcibly manipulating a stiff shoulder — it’s what this trial tested against physical therapy. Shoulder manipulation performed as manual therapy is a different, awake, hands-on technique physical therapists use as one part of an active rehabilitation program, most commonly for shoulder impingement and subacromial pain rather than frozen shoulder specifically. If you’re trying to figure out which one applies to your situation, that article breaks down what the technique actually involves and the research behind pairing it with exercise.
Getting Started
If you’ve been told you have frozen shoulder and are weighing MUA or surgery against physical therapy, the research above suggests conservative care gets you to a comparable outcome with meaningfully less risk. Mend’s Boulder and Lafayette clinicians build a physical therapy plan around where your shoulder is in the freezing, frozen, or thawing phase — book an evaluation to find out where you stand and what a conservative treatment timeline looks like for you.
