ANALYSIS OF FINGER EXTENSOR MECHANISM STRAINS

Strains in the extensor mechanism of the finger were measured in a cad aver model using Hall-effect transducers. Several components of the me chanism were evaluated at different joint positions, with different in trinsic and extrinsic tendon loading conditions, and after creating a boutonniere deformity. Landsmeer's theory that predictable and obligat ory interactions occur within the extensor mechanism during finger mov ement is strongly supported by our results. The concept of the Bunnell intrinsic-lightness lest was confirmed. Results were consistent with clinical observations and current theories on the pathomechanics of cl aw and boutonniere deformities. Based on our experimental findings, we conclude that strain analysis is an effective method of evaluation of the extensor mechanism with potential for in vivo surgical applicatio ns.