[A boy with functional impairment of his thumb]. / Een jongen met een functiebeperking van zijn duim.

ABSTRACT

An 11-year-old boy was referred with poorly understood atrophy of his thenar and functional impairment of his right thumb. Sensation in the median nerve distribution was normal but the affected thumb was smaller with decreased skin creases, an unstable metacarpophalangeal joint and diminished strength. He was diagnosed with a type 2 hypoplastic thumb and we advised an opponensplasty.