Biomechanical differences of the proximal interphalangeal joint volar plate during active and passive motion: a dynamic ultrasonographic study.
The Volar Plate (VP) of the proximal interphalangeal (PIP) joint is a fibrocartilaginous structure located anteriorly. Its 2 proximal lateral fibrous bundles, termed “check” or “checkrein” ligaments, are strong restraints against hyperextension. The superficial surface of the VP provides a smooth gliding surface for the flexor tendons, and the deep surface has a synovial covering and forms the inner surface of the PIP joint. The VP may provide some lateral stability to the PIP joint. Clinically, adhesion of the VP is one of the important factors causing a flexion contracture of the PIP joint.
The purpose of this study is define the biomechanical differences of the volar plate (VP) of the proximal interphalangeal joint during active and passive motion, which may provide clues to understanding the functional importance of the volar elevation of the VP.
From an anatomical viewpoint, volar elevation of the VP seen in active flexion could provide dynamic stresses on the adjacent ligaments and contribute to the stability and smooth gliding of the joint > from Saito et al.; Journal of Hand Surgery 37A (2012) 1335–1341. All rights reserved to the American Society for Surgery of the Hand.
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