Patent ID: 8858644
Filing Date: 2014-10-14
Classification: A61F

Abstract:
1. An orthopedic implant used in arthroplasty of the fingers, comprising a first element for implantation in a proximal phalanx and a second element for implantation in an adjacent distal phalanx, each element having a respective stem sized for implantation in the respective phalanx and an interphalangeal pivot head, a head of the first element having a biconvex condylar pivot surface including a central valley having a radius of curvature R 5 in the frontal plane, and a head of the second element having a biconcave condylar pivot surface designed to fit generally complementarily with the biconvex condylar pivot surface including a central ridge having a radius of curvature R 6 in the frontal plane, wherein the biconcave and biconvex condylar pivot surfaces at rest are congruent in the frontal plane and are not congruent in the sagittal plane, and wherein radii of curvature R wherein the central valley of the biconvex condylar pivot surface and the central ridge of the biconcave condylar pivot surface define an intercondylar space along a length of the central valley, the intercondylar space having a volume between 15 mm