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Type III-A hypoplastic thumb
P R Manske1, H R McCarroll, M James
1St. Louis Shriners Hospital for Crippled Children, MO, USA.
The Journal of Hand Surgery
|March 1, 1995
Summary
This study reviews type III-A hypoplastic thumbs, detailing their unique characteristics like stable carpometacarpal joints and specific tendon abnormalities. Surgical reconstruction was the primary treatment, avoiding ablation or index pollicization.
Area of Science:
- Orthopedics
- Hand Surgery
- Pediatric Orthopedics
Background:
- Hypoplastic thumb is a congenital condition affecting thumb development.
- Type III-A hypoplastic thumbs present with specific anomalies, distinct from other classifications.
- Understanding these anomalies is crucial for appropriate management.
Purpose of the Study:
- To characterize the clinical and radiological features of type III-A hypoplastic thumbs.
- To differentiate type III-A from type III-B hypoplastic thumbs.
- To review treatment strategies for type III-A hypoplastic thumbs.
Main Methods:
- Retrospective review of thirteen cases of type III-A hypoplastic thumbs.
- Detailed analysis of anatomical abnormalities, including joint stability and extrinsic tendon involvement.
- Documentation of surgical interventions performed.
Main Results:
- All thirteen thumbs exhibited features of type II hypoplasia plus stable carpometacarpal joints.
- Extrinsic tendon abnormalities were common, including absent extensor pollicis longus and aberrant flexor pollicis longus tendons.
- Twelve thumbs underwent surgical reconstruction; none were treated with ablation or index pollicization.
Conclusions:
- Type III-A hypoplastic thumbs are characterized by specific extrinsic tendon abnormalities and stable carpometacarpal joints.
- Surgical reconstruction is a viable treatment option for type III-A hypoplastic thumbs.
- Distinguishing type III-A from III-B is essential for surgical planning.