<prompt> Madelungs deformity involves -HumerusProximal ulnaDistal radiusCarpals  <response>: Ans. is c i.e., Distal radiusMadelungs deformityo Madelungs deformity is a congenital disorder that affects growth of distal radius.o The primary defect is failure of normal growth of medial and palmar halves of the distal radial physis, leading to curvature in an medial ulnar and palmar direction,o The ulna is relatively long and becomes prominent dorsally.o The carpus carpal bones sinks, along with the medial ulnar half of the distal radial articular surface, into the gaps between the two forearm bones. 