In shoulder arthroplasty, what degree is typically used for humeral retroversion?

In shoulder arthroplasty, what degree is typically used for humeral retroversion?

• A. 25 degrees
• B. 30 degrees
• C. 35 degrees
• D. 40 degrees

Answer: (B)

Humeral retroversion is the backward twist of the humeral head relative to the distal humerus in the transverse plane. In shoulder arthroplasty, placing the humeral component at about 30 degrees of retroversion restores a position that matches how the native humerus typically sits in most adults. This angle provides a good balance between enabling external rotation and maintaining joint stability. If you set less retroversion, external rotation can be limited and the joint can impinge during movement. If you set too much retroversion, you may gain external rotation but at the cost of increased risk of instability or altered kinematics. Therefore, 30 degrees is the conventional target to reproduce a functional, stable, and well-balanced articulation.

Humeral retroversion is the backward twist of the humeral head relative to the distal humerus in the transverse plane. In shoulder arthroplasty, placing the humeral component at about 30 degrees of retroversion restores a position that matches how the native humerus typically sits in most adults. This angle provides a good balance between enabling external rotation and maintaining joint stability. If you set less retroversion, external rotation can be limited and the joint can impinge during movement. If you set too much retroversion, you may gain external rotation but at the cost of increased risk of instability or altered kinematics. Therefore, 30 degrees is the conventional target to reproduce a functional, stable, and well-balanced articulation.