College of Massage Therapists of British Columbia (CMTBC) Practice Exam

If a patient presents with a positive Circumduction Test, should the therapist note an anterior or posterior GH subluxation in their charts?

1. Anterior GH subluxation

2. Posterior GH subluxation

3. Inferior GH subluxation

4. No GH subluxation

The correct answer is: Posterior GH subluxation

In the case of a positive Circumduction Test, the correct choice is to note a posterior glenohumeral (GH) subluxation. The Circumduction Test is primarily used to assess the integrity and function of the shoulder joint by evaluating the range of motion and the mechanics involved during arm movement. When the test is positive, it often indicates that there is an issue with the shoulder joint's mechanics, particularly in how the head of the humerus moves in relation to the glenoid fossa of the scapula. A positive result is typically associated with limitations or abnormalities in movement, which can suggest the presence of a posterior subluxation. In the case of a posterior GH subluxation, the humeral head shifts slightly out of its normal position towards the back (posterior) of the joint, which can lead to characteristic patterns of restricted motion or discomfort during circumduction. Other potential subluxations like anterior or inferior are not consistent with the findings that would emerge from a positive Circumduction Test. For instance, an anterior subluxation would typically manifest itself with specific signs of instability or dislocation that are not indicated by the test. This distinction is crucial for accurate documentation and subsequent treatment planning.