Which sign would you expect in a neonate with radial dysplasia?

• A. Limited movement of the hand, wrist, and forearm
• B. Normal joint mobility
• C. Pain with movement
• D. Increased grip strength

Answer: (A)

Radial dysplasia causes limited movement of the hand, wrist, and forearm because the radius on the radial side is underdeveloped or absent, leading to a fixed deformity and restricted forearm rotation and wrist motion. In a neonate, this structural abnormality manifests as a reduced range of motion at the wrist and forearm and a hand held in an atypical posture (radial deviation). Pain with movement is not a typical presenting sign in newborns, and normal joint mobility would not be expected given the congenital malformation. Increased grip strength is not characteristic of this condition; instead, ROM is limited by the bony and soft tissue deformity.