Due to a developmental arrest, there is an abnormal alignment of the joint surfaces at either interphalangeal joint causing angulation in the plane of the palm. The finger may be slightly bent or have a very prominent bend.
Clinodactyly
Sclerodactyly
Polydactyly
Oligodactyly
Syndactyly
Synpolydactyly
Pachydermodactyly
Ectrodactyly