In radial dysplasia, which bone is typically bowed?

• A. Radius
• B. Ulna
• C. Humerus
• D. Fibula

Answer: (B)

Radial dysplasia primarily affects the radial side of the forearm, causing bowing and often shortening of the radius. This bowing of the radius leads to the characteristic radial club hand, with the hand deviating toward the thumb side and reduced wrist motion. The ulna is not the bone that is typically bowed in this condition, and the humerus or fibula are not involved in this forearm anomaly. So the bone that is typically bowed is the radius.