What is the average humeral retroversion reproduced in arthroplasty?

• A. 10 degrees
• B. 30 degrees
• C. 20 degrees
• D. 40 degrees

Answer: (B)

Reproducing about 30 degrees of humeral retroversion during shoulder arthroplasty helps restore the natural rotational alignment of the joint. This angle mirrors the typical native outward twist of the humeral head and allows the rotator cuff and surrounding soft tissues to function with balanced tension, supporting good external rotation while maintaining stability.

If retroversion is set too little, external rotation can be limited and the joint may impinge during movement. If it’s set too much, internal rotation and overall joint stability can be compromised. While individual anatomy varies, the common target around 30 degrees reflects the average native retroversion used to optimize postoperative function.