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

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What is the normal range of motion for abduction at the glenohumeral joint?

180 degrees
30-50 degrees
50-70 degrees
0-30 degrees

The correct answer is: 180 degrees

The normal range of motion for abduction at the glenohumeral joint is typically recognized as being around 180 degrees. This measurement represents the degree to which the arm can be raised away from the body in a lateral direction, which is a critical motion for numerous activities, from everyday tasks to athletic performance. Understanding this range is essential for assessing shoulder function and diagnosing potential limitations or dysfunctions. The glenohumeral joint, being a highly mobile ball-and-socket joint, allows for a wide range of movements and is pivotal in upper extremity activities. The other provided ranges do not encompass normal physiological movement for the glenohumeral joint during abduction. A range of 30-50 degrees, for example, would be indicative of a severe limitation in motion, which is not typical of a healthy shoulder. Similarly, ranges of 50-70 degrees or 0-30 degrees would also signify restrictions that might warrant further investigation. Understanding the normal 180-degree range helps in both the evaluation of shoulder health and the development of treatment plans for patients requiring rehabilitation or therapeutic interventions.