Complete prosthesis for big toe - has spherical headed foot member acting against concave plate on mushroom shaped toe member

摘要

The complete prosthesis for the large toe includes a member attached to the foot, having a cap with a convex surface. Interconnected with this is a thin concave counter plate anchored to the end of the toe member. The polar angle between the counter plate and the centre of curvature is less than 100 deg. This counter plate is mushroom shaped mounted on a spindle anchored in the base member behind. The first member can have a spherical surface. The function of the prosthesis is to replace a complete bone in the big toe, and it has a joint surface at each end.