The Incidence and Variation of the Accessory Tendons of the Abductor Pollicis Longus to the Trapezium

Abstract

The first carpometacarpal (CMC) joint is of considerable interest to occupational therapists due to the incidence of first CMC osteoarthritis. To provide effective treatment for disorders affecting the thumb, it is imperative for occupational therapists to comprehend the anatomy and biomechanics of the thumb. Unfortunately, the literature concerning the anatomy and function of this joint is confusing at best. The aims of this descriptive research study are: (a) to complete a comprehensive literature review on the structure and function of the first CMC joint and the anatomical variations of the abductor pollicis longus (APL), (b) to plan an algorithm for dissection, (c) to perform a cadaveric dissection to determine the incidence and variation of accessory tendons of the APL to the trapezium, and (d) to compare findings to previous cadaveric research. Overall, this study will address the question: What is the incidence and variation of accessory tendons of the APL to the trapezium?