• ANZ journal of surgery · Sep 2018

    Anatomical variations in the first extensor compartment: a cadaver study.

    • Hao Xu, Ji-Xia Wu, Qiang Wang, and Zheng-Yu Gao.
    • Department of Joint Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China.
    • ANZ J Surg. 2018 Sep 1; 88 (9): 913-916.

    BackgroundAnatomical variations in the first extensor compartment are associated with the pathogenesis of de Quervain's disease. Here, we report two novel anatomical variations of the first extensor compartment.MethodsThe wrists of two adult cadavers were dissected to reveal the anatomical variations in the first extensor compartment.ResultsIn one of the cadavers, no septum was present in the first extensor compartment. However, the extensor pollicis brevis tendon and its proximal muscle belly were absent. The abductor pollicis longus (APL) tendon had multiple slips, and one of them inserted on the dorsal base of the proximal thumb phalanx. In another cadaver, a septum was present in the first extensor compartment. One of the multiple APL tendon slips ran into the septum alongside the extensor pollicis brevis tendon for 4 mm, which then exited the septum and inserted into the base of the first phalanx together with the APL tendon.ConclusionOur findings may help to improve the awareness of the anatomical variations in the first extensor compartment.© 2018 Royal Australasian College of Surgeons.

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