Question

question 22

compared to the shoulder, displacements of the hip joints are ______.

a - rare because of the ligament reinforcement
b - common in all people who are overweight
c - rare because the rotator cuff stabilizes the hip joint
d - common due to the weight bearing the hip endures

Explanation:

Compare joint structures

Using the Joint Stability and Mobility and Glenohumeral Joint Anatomy knowledge points

• The shoulder (glenohumeral) joint is a shallow ball-and-socket joint designed for maximum mobility, making it highly susceptible to dislocation (displacement).
• The hip (coxal) joint is a deep ball-and-socket joint secured by a strong articular capsule, deep acetabulum, and powerful reinforcing ligaments (such as the iliofemoral, pubofemoral, and ischiofemoral ligaments).
• Consequently, hip displacements are far less common (rare) compared to shoulder displacements.

Evaluate the options

• Option A: Correct. Hip dislocations are rare because of the deep socket and strong ligamentous reinforcement.
• Option B: Incorrect. Weight can increase joint stress, but displacements are not universally common in all overweight individuals.
• Option C: Incorrect. The rotator cuff is a muscle group that stabilizes the shoulder joint, not the hip joint.
• Option D: Incorrect. Hip displacements are rare, not common, despite the weight-bearing load.

Answer:

• (A) rare because of the ligament reinforcement (Correct answer)
• (B) common in all people who are overweight
• (C) rare because the rotator cuff stabilizes the hip joint
• (D) common due to the weight bearing the hip endures