Prosthesis for distal radioulnar joint

摘要

Among other things, there are disclosed embodiments of implants for repairing or relieving damage to the distal radioulnar joint. A component for replacing at least part of the ulnar head includes a concave surface for accommodating a convex surface of a component for attachment to the radius, e.g. in the sigmoid notch of the radius.

主权项

1. A system to replace at least a portion of the distal radio-ulnar joint, comprising:
a first component for attachment to a distal portion of a patient's radius bone, said first component having a convex outer surface portion having a first radius of curvature to be directed substantially away from the radius bone and an opposite surface configured differently from said convex outer surface portion, and having at least one prong extending from said opposite surface for insertion into the radius bone, whereby the first component is fixed to the radius bone; and a second component for attachment to a distal portion of a patient's ulna so as substantially to face said first component, said second component having a concave outer surface with a second radius of curvature greater than said first radius of curvature and a second surface non-continuous with said concave outer surface for facing a portion of the ulna, said second component having a longitudinal axis extending through the second component, wherein when implanted, said convex outer surface portion of said first component lies adjacent or in contact with said concave outer surface of said second component, said longitudinal axis is substantially parallel to the patient's ulna, and said first component is capable of travel with respect to said second component in rotation substantially around said longitudinal axis and in translation substantially along the direction of said longitudinal axis.