Knee joint load measuring instrument and joint prosthesis

摘要

A system is disclosed for measuring dynamically forces applied to a prosthetic joint. The system comprises a first support member attached to an outer surface of a first bone, a second support member attached to an outer surface of a second bone and a transducer secured to the second support member and engaging the first support member. The transducer measures forces applied to the first and second support member as the prosthetic joint is articulated and provides a representative force output signal. In the preferred embodiment, the transducer comprises a central body having plurality of integrally formed flexure members, each flexure member defined by a corresponding cavity in the body and defining a force responsive flexure section. A plate is secured to the transducer with support posts to localize forces onto the flexure members. Although the assembly forms components for implementation of a knee prosthetic, the present invention can be adapted to any particular joint of the body.