What is the normal range of motion for forearm supination?

What is the normal range of motion for forearm supination?

• A. 0-45°
• B. 0-90°
• C. 0-120°
• D. 0-60°

Answer: (B)

Forearm supination is the rotation that turns the palm from facing down toward facing up. The normal range is about 0 to 90 degrees. When the elbow is flexed at 90 degrees, starting from a neutral position you rotate the hand outward until the palm faces upward, which is roughly 90 degrees of rotation. This range reflects the limits set by the radioulnar joints and surrounding soft tissues, including the interosseous membrane and the supinator muscle. In clinical terms, 0–90 degrees is considered normal; smaller ranges indicate restriction, while about 120 degrees would exceed typical normative limits.

Forearm supination is the rotation that turns the palm from facing down toward facing up. The normal range is about 0 to 90 degrees. When the elbow is flexed at 90 degrees, starting from a neutral position you rotate the hand outward until the palm faces upward, which is roughly 90 degrees of rotation. This range reflects the limits set by the radioulnar joints and surrounding soft tissues, including the interosseous membrane and the supinator muscle. In clinical terms, 0–90 degrees is considered normal; smaller ranges indicate restriction, while about 120 degrees would exceed typical normative limits.