Which shoulder condition is more likely to present with increased glenoid retroversion?

Which shoulder condition is more likely to present with increased glenoid retroversion?

• A. Dominant Shoulder
• B. Non-Dominant Shoulder
• C. Both Equally
• D. Neither

Answer: (A)

Repetitive overhead throwing causes adaptive remodeling of the throwing arm, including changes in the orientation of the glenoid fossa. The dominant shoulder, used more for throwing, experiences more posteriorly directed forces and internal rotation work, leading to an increase in glenoid retroversion to accommodate these motions. That makes the dominant shoulder more likely to present with increased glenoid retroversion. The non-dominant shoulder undergoes less of this repetitive stress, so retroversion is less likely there. The idea that both sides or neither would show this adaptation doesn’t fit the unilateral nature of throwing-related remodeling.

Repetitive overhead throwing causes adaptive remodeling of the throwing arm, including changes in the orientation of the glenoid fossa. The dominant shoulder, used more for throwing, experiences more posteriorly directed forces and internal rotation work, leading to an increase in glenoid retroversion to accommodate these motions. That makes the dominant shoulder more likely to present with increased glenoid retroversion.

The non-dominant shoulder undergoes less of this repetitive stress, so retroversion is less likely there. The idea that both sides or neither would show this adaptation doesn’t fit the unilateral nature of throwing-related remodeling.