TOTAL METATARSOPHALANGEAL PROSTHESIS WITH SECTION PLANE

摘要

The invention concerns a metatarsal implant (6) consisting of a body (12) and a bone anchoring rod (13), a phalangeal implant (7) and an intermediate plate (8) adapted to be arranged on the phalangeal implant and provided with an articular surface (17) co-operating with a matching articulation surface of the metatarsal implant body; the phalangeal implant (7) comprises a base (24) having the shape of a revolving funnel, mounted on a bone anchoring member (27) and whereon is supported the intermediate plate (8), which can rotate with the metatarsal implant (6) relatively to the base (24). The articular surfaces between the metatarsal implant (6) and the intermediate plate (8) have a double curvature which restores the joint natural anatomy; there is provided a possibility of rotation of the plate (8) with the metatarsal implant (6) relatively to the phalangeal implant (7) which also reproduces the natural rotation of the toe bone (2) relatively to the metatarsus (1) while walking. The double curvature of the articular surfaces ensures excellent congruency between the metatarsal and the phalangeal implants.