Short thumb Thumb hypoplasia grade 3A 2024-07-06T11:45:23Z A type of developmental undergrowth of the thumb, whereby there are musculotendinous and osseous deficiencies with the carpometacarpal (CMC) joint intact. Absence of active motion at the metacarpophalangeal (MCP) or interphalangeal (IP) joint. Hypoplasia of the thumb grade IIIA