Oliver Bee RMTRegistered Massage Therapist

Massage therapy · Kitchener–WaterlooFrozen Shoulder

Neck & Shoulder

What It Is

Line drawing of the front of the shoulder, showing the top of the upper arm bone sitting against the shoulder blade with the joint capsule wrapped around the joint.
In frozen shoulder, this capsule around the joint thickens and tightens, leaving the arm less room to move.
Line drawing of the shoulder with arcs showing how far the arm lifts, and the deltoid, chest and trapezius muscles around the joint.
Frozen shoulder steadily shrinks this range, then slowly gives it back through the thawing stage.

Frozen shoulder causes stiffness and pain in the shoulder. Over time, the shoulder becomes very hard to move (AAOS, n.d.). It is usually quoted as affecting around 2 percent of the population (Zreik et al., 2016). It most commonly affects people between 40 and 60 years of age, and it occurs more often in women than in men (AAOS, n.d.). It can take months or even years to get better, but the pain and stiffness usually go away eventually (NHS, 2024).

It is often not clear why people get frozen shoulder (NHS, 2024). It can happen after an injury or surgery that stops you moving your arm normally (NHS, 2024). When the shoulder is held still for a period of time, for example in a sling after surgery, a fracture or another injury, the joint is at risk of stiffening. This is sometimes called secondary stiffness (AAOS, n.d.).

Frozen shoulder Anatomy

The shoulder is a ball-and-socket joint made up of three bones: the upper arm bone (humerus), the collarbone (clavicle) and the shoulder blade (scapula). The head of the upper arm bone sits in a shallow socket in the shoulder blade. Strong connective tissue, called the shoulder capsule, surrounds the joint. To help the shoulder move easily, synovial fluid lubricates the joint and the capsule (AAOS, n.d.).

In frozen shoulder, the capsule thickens and becomes stiff and tight. Thick bands of tissue, known as adhesions, develop. In many cases there is less synovial fluid in the joint. One of the main signs of this condition is not being able to move your shoulder, whether you try on your own or someone else moves it for you (AAOS, n.d.).

Diagnosis is usually based on range-of-motion tests: first you raise and lower your arm yourself, and then the doctor gently moves your shoulder. An X-ray or MRI may be used to rule out other problems, though scans are not needed to diagnose frozen shoulder (AAOS, n.d.).

Frozen shoulder often develops in three stages (according to the textbook, although be aware this is not always the case, and the stages can overlap) (AAOS, n.d.; Rangan et al., 2015). In the first stage, the "freezing stage", pain slowly increases and the shoulder loses range of motion; this typically lasts from 6 weeks to 9 months. In the "frozen stage", the pain may ease, but the shoulder stays stiff and daily activities can be very difficult; this typically lasts 4 to 6 months. The third stage is the "thawing stage", when shoulder movement slowly improves; a return to normal or close to normal typically takes from 6 months to 2 years (AAOS, n.d.). However, frozen shoulder does not always settle on its own, and some people need further treatment (Rangan et al., 2015).

Not a diagnosis — for more information, contact me or another trusted healthcare provider.

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