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Type III—A hypoplastic thumb

1995; Elsevier BV; Volume: 20; Issue: 2 Linguagem: Inglês

10.1016/s0363-5023(05)80018-8

1531-6564

Paul R. Manske, H. Relton McCarroll, Michelle A. James,

Prenatal Screening and Diagnostics

Thirteen type III-A hypoplastic thumbs were reviewed. The abnormalities included those found in type II hypoplasia (narrow thumb-index web space, hypoplastic thenar muscles, unstable metacarpophalangeal joint, as well as extrinsic tendon abnormalities); all had stable carpometacarpal joints. They are differentiated from type III-B hypoplastic thumbs, which have an unstable carpometacarpal joint due to a deficient base of the metacarpal. The extrinsic tendon abnormalities included absent extensor pollicis longus tendon, absent or aberrant flexor pollicis longus tendon, and a tendon interconnection between the flexor pollicis longus and extensor aponeurosis. Twelve of the thumbs had surgical reconstruction. None was treated with ablation and index pollicization.