A classification system for anomalies of the extensor pollicis longus.

Türker, Tolga; Robertson, Gregory A; Thirkannad, Sunil M · Hand (N Y) · 2010

case_series · Level IV

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Abstract

Variations of the long extensor tendon to the thumb are very rare. We present three cases in which there was a supernumerary long extensor tendon to the thumb. In all three cases, the supernumerary tendon emerged from the fourth dorsal compartment and had a parallel course to the extensor pollicis longus. Details of the anomalies are described along with a meta-analysis of relevant literature. A classification system of these anomalies is also proposed.