Introduction
Shoulder pain is common, particularly in midlife. Two diagnoses appear frequently in clinics: frozen shoulder (adhesive capsulitis) and rotator cuff injury. Both affect the same region and often the same age group, so they are sometimes confused.
The distinction matters. These conditions involve different tissues and follow different biological timelines. When the underlying problem is misunderstood, treatment may focus on the wrong issue and recovery can take longer.
A Common Situation
A woman in her 50s fell onto her arm and developed shoulder pain. She sought care shortly afterward. At her first physiotherapy visit she was told she had frozen shoulder. The reasoning was that the injury caused her to stop using the arm, and that reduced use combined with hormonal factors had triggered the condition.
Based on that assumption, treatment focused mainly on gentle range‑of‑motion exercises such as pendulums and wall climbing.
The problem was timing.
Frozen shoulder usually does not develop immediately after injury. It is not caused by the injury itself, but by changes in the shoulder capsule that develop over time with inflammation and restricted use.
At that early stage the patient could still move her shoulder through a near‑full range when the arm was moved passively. Movement was painful, but the joint was not mechanically stiff.
Two months later imaging revealed the actual cause: a tear of the subscapularis tendon, one of the rotator cuff muscles.
The label mattered. Frozen shoulder suggests a capsular condition that gradually stiffens the joint. A rotator cuff tear is a tendon injury and requires different reasoning about loading, strength, and recovery.
Capsule Versus Tendon
The essential difference lies in the tissue involved.
Frozen shoulder is a disorder of the joint capsule. The capsule becomes inflamed and thickened, which physically restricts movement.
Rotator cuff disorders involve the tendons that move and stabilize the shoulder. These tendons may become irritated, overloaded, or torn. They can generate significant pain but usually do not block passive movement of the joint.
Because pain can limit how people move, the two conditions may appear similar at first.
The Key Question During Assessment
When assessing shoulder pain, one question is often very helpful:
Can the shoulder move fully when someone else moves it?
In frozen shoulder, both active and passive movement become restricted. The joint feels blocked.
In rotator cuff injury, movement may be painful or weak, but passive range of motion is usually preserved.
Pain can limit effort. Capsular stiffness limits movement regardless of effort.
What Happens During an Assessment
A shoulder assessment typically involves looking at several factors:
• how the symptoms began
• how the shoulder moves during everyday activities
• active and passive range of motion
• strength and coordination of the rotator cuff muscles
• patterns of movement restriction
These findings help determine whether the problem behaves more like a capsular condition or a tendon‑related problem.
If anything unusual or concerning appears during assessment, referral to another healthcare professional may be appropriate.
How Treatment Can Help
Management depends on what the assessment suggests.
When stiffness of the capsule is the main issue, treatment often focuses on gradually restoring mobility and reducing protective muscle guarding.
When rotator cuff tendons are involved, treatment often emphasizes improving load tolerance, coordination, and strength around the shoulder.
Depending on the situation, care may include massage therapy, guided movement work, and progressive exercise aimed at restoring comfortable shoulder function.
The exact approach always depends on the individual presentation.
A Simple Takeaway
If you have been told you have frozen shoulder, it can be reasonable to ask:
• Was my passive range of motion examined?
• Is my shoulder mechanically stiff, or mainly painful?
• Did the symptoms begin after trauma or overload?
Understanding the underlying tissue helps guide more appropriate treatment.
Scope of Practice Note
Registered Massage Therapists do not provide medical diagnoses. The discussion above reflects clinical assessment and reasoning used to guide treatment decisions and referral when appropriate.
If you’ve been experiencing shoulder symptoms like those mentioned in this article, or if a healthcare provider has recommended massage therapy, you may benefit from an appointment with Jinsheng Zhao (JZ), Registered Massage Therapist. JZ will be available starting May 11, 2026, after he comes back from his trip.
Please contact JZ at jzhao@orthophysio.com or call The Orthopaedic Therapy Clinic at 416-925-4687 to book.
