Pollex Valgus: Orthopaedic Management for Ulnar Instability of the Metacarpophalangeal Joint of the Thumb

Abstract

This article describes pollex valgus, the condition of ulnar instability of the thumb's rnetacarpophalangeal joint, relevant to the field of physical therapy. Following a discussion of the normal anatomy and biomechanics of the metacarpophalangeal joint and its component structures, the joint capsule, ulnar collateral ligament, accessory ulnar collateral ligament, volar plate, and adductor aponeurosis, the author details pollex valgus pathology. Emphasis is given to mechanisms of injury and the specific lesions, including ligament sprain and rupture, avulsion, joint locking, and the Kaplan and Stener lesions. Orthopaedic management of pollex valgus is presented in terms of evaluation, via the case history and clinical examination, and treatment, by tape strapping and surgical repair. The author concludes with mention of active exercise and joint mobilization for the rehabilitation of pollex valgus lesions. J Orthop Sports Phys Ther 1986;6(6):334-342.