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...http://www.google.co.uk/patents/US5197488?utm_source=gb-gplus-sharePatent US5197488 - Knee joint load measuring instrument and joint prosthesis
