Prosthetic implant for a metatarso phalangeal joint and milling device for setting it in place.

摘要

1. Prosthetic implant for a phalangeal prosthesis having a concave outer surface and a metatarsal prosthesis having a convex outer surface of the same curvature as that of the concave surface, characterized in that the phalangeal prosthesis (1) is in the form of a cupula having a hollow cylindrical part (2) connected to a base (3), whose outer face (4) is concave in order to fulfil the function of the articular cartilage which has disappeared, said cupula serving to cover the bottom of the first phalanx (8) of the toe to be treated by hard frictional driving in of its cylindrical part into the recesses with corresponding dimensions formed by means of a trephine in the corticalis, namely the osteophytes (9) surrounding said bottom of the first phalanx, the cupula (1) thus being fixed in the bone by a portion of its cylindrical part (2) and in that the metatarsal prosthesis (5) comprises a part shaped like a spherical cap (6) which will serve as the articular cartilage and which surmounts a part shaped like a truncated cylinder (7) to which it is connected, said metatarsal prosthesis serving to be fixed to the anterodorsal face of the head (10) of the metatarsal bone (11) corresponding to said toe by said truncated cylinder (7), which for this purpose is driven in with hard friction and is thus locked in a recess having corresponding dimensions and formed by means of a trephine in the dorsal region of the heat of said metatarsal bone.