Why that stiff shoulder might not actually be a frozen shoulder

Many people with a stiff and aching shoulder quickly assume they have a frozen shoulder, but medical experts warn that the condition is often mislabeled. True frozen shoulder, medically known as adhesive capsulitis, affects only about two to five percent of the general population. Orthopaedic specialists note that persistent shoulder pain is much more common, meaning many patients carrying the label actually have a different underlying issue.

Medical Tests and Differences

The distinction matters because treatments for various shoulder problems can take opposite directions, as frozen shoulders require gentle, controlled movements while a rotator cuff problem can worsen with the same stretches. The most useful clinical test requires no scan and compares active movement against passive movement. In a true frozen shoulder, both active and passive movements are restricted, particularly when the arm turns outward or lifts forward, because the capsule around the joint has tightened. By contrast, in a condition called pseudoparalysis, the patient cannot lift the arm on their own, yet an examiner can raise it much further because the powering mechanism has failed due to a major rotator cuff problem.

Types and Risk Factors

Frozen shoulder is broadly divided into two kinds. Primary frozen shoulder has no clear cause, and specialist clinics observe that nearly 80 percent of these patients are perimenopausal women, though this is a clinical observation rather than a population figure. Secondary stiffness follows an injury, surgery, a period of immobilisation, or another shoulder condition, and it affects men and women more evenly. Other health issues like diabetes and thyroid disease must also be considered, especially in India where diabetes is common, as a diabetic patient's stiff shoulder is often wrongly blamed entirely on a frozen shoulder while a tendon problem sits alongside it. Other possible causes for shoulder pain include rotator cuff disease, arthritis, calcific tendinitis, nerve problems in the neck, labral injuries, AC joint pain, fractures, dislocations, infections, and inflammatory diseases.

Context

Orthopaedic care relies heavily on physical examination techniques like testing range of motion to separate joint capsule restrictions from muscle or tendon failures. Conditions like diabetes frequently complicate musculoskeletal healing and joint stiffness, making accurate diagnosis essential before starting any physical therapy.