Anomalous origin of the Abductor Pollicis Longus (APL): clinical and surgical applications

ABSTRACT

The Abductor Pollicis Longus (APL) is known to have a big variety in its number of insertion tendons.Because of that, studies about variations in its origin are not frequently achieved like studies about its insertionforms. This study describes an anatomic variation of the Abductor Pollicis Longus, with an anomalous venteroriginated of the inferior portion of the lateral border of the radio. Surgical and clinical implications are inrelation principally with the big number of tendons of insertion of the APL, but there are related cases inthe literature in that additional venter of this muscle also can be involved in the physiopathology of clinicalsyndromes, like the tenosynovitis of de Quervain