Abstract: A thumb prosthesis includes a trapezial component adapted to be fixed in the trapezium and a metacarpal component adapted to be fixed in the metacarpal bone. The trapezial component has a self-cutting thread adapted to be screwed into the trapezium; a polygonal base, having a conical surface and a neck part and being situated at one end of the self-cutting thread; and a spherical head disposed on the conical surface and extending from the neck part. The metacarpal component has a frustoconical head having a large-diameter end and an opposite, small-diameter end and a geometrical axis; a hemispherical socket provided in the small-diameter end and receiving a surface portion of the spherical head; and a stem extending from the large-diameter end of the frustoconical head. The stem is offset relative to the geometrical axis and has a decreasing triangular cross section with rounded corners as viewed in a direction away from the frustoconical head.

Abstract: The present invention is a device for the straightening, fixing, compressing, and elongating of cervical vertebrae. The present invention includes a pair of rods extending to occipital plates. The occipital plates conform to the shape and inclination of the occiput. A connecting plate is attached to the ends of the occipital plates. A pedicular clamp having hooks is attached on one of the rods. A hook is connected to another of the rods. Screws are provided so as to secure the occipital plates and the connecting plate to the occiput and the connecting plate to ends of the occipital plates.