hitchhiker's thumb


Also found in: Dictionary, Thesaurus, Encyclopedia.
A condition characterised by bilateral abduction of the thumbs—proximally placed and hypermobile—associated with deformed and dense carpal and metacarpal bones, seen in diastrophic dwarfism, occasionally Fanconi’s anaemia and acrocephalosyndactyly
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

hitchhiker's thumb

A hyperextended thumb or the ability to extend the distal interphalangeal joint of the thumb more than 45 degrees. It is an autosomally inherited trait.
See also: thumb
Medical Dictionary, © 2009 Farlex and Partners