Radial club hand is a rare condition that some babies are born with, where the bone on the thumb side of the forearm (called the radius) doesn't develop properly. This causes the hand and wrist to bend inward toward the thumb, giving it a curved or "clubbed" appearance. In mild cases, the radius might be slightly shorter than normal, causing only a slight curvature. In more severe cases, the radius can be completely absent, leading to a significant deformity and functional impairment.

This condition can affect not just the bones, but also the muscles, tendons, nerves, and blood vessels in the arm and hand. The thumb is often underdeveloped, or it may be missing entirely, which can further limit hand function. Radial club hand is usually noticeable at birth, and it can occur in one or both hands. The exact cause is often unknown, but it can sometimes be associated with genetic syndromes or other developmental abnormalities.

For more severe cases, surgery is usually required to reposition the hand, improve its alignment, and sometimes to create a functioning thumb from one of the fingers if necessary. The goal of treatment is to enhance the child's ability to use their hand while also improving its appearance.

While radial club hand can pose significant challenges, early intervention and a tailored treatment plan can help many children achieve improved function and a better quality of life.