Radial Longitudinal Deficiency (RLD)

Radial Longitudinal DeficiencyThe radius is a bone in the forearm that extends from the elbow to the wrist. In a child born with a radial longitudinal deficiency (RDL), this bone is either absent or much shorter than it should be. This results in a misshapen forearm or wrist. Children with RDL also frequently have hypoplastic thumb. A hypoplastic thumb is usually smaller or weaker than an average thumb. It can affect any part of the arm—from the shoulder to the fingers.

Radial Longitudinal Deficiency XrayTreatment—often surgical—is designed to create a straight, stable wrist and functional thumb. This condition is often associated with different congenital (at birth) syndromes where other parts of the body are affected as well.