Type III-A hypoplastic thumb
Related Experiment Video
Updated: Oct 26, 2026

Ultrasound-Guided Needle Release Combined with Corticosteroid Injection for the Treatment of Supinator Syndrome
Published on: May 26, 2023
P R Manske1, H R McCarroll, M James
1St. Louis Shriners Hospital for Crippled Children, MO, USA.
Abstract:
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.
Related Concept Videos
Bones of the Upper Limb: Humerus
Bones of the Upper Limb: Ulna
Bones of the Upper Limb: Radius
The radius has a nail-shaped head, and a short...
Changes in the Appendicular Skeleton with Age
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Cardiomyopathy III: Hypertrophic Cardiomyopathy
Type I Diabetes III: Clinical Manifestations

