Nowadays, most, if not all, of instrumented knee implants developed to measure the in-vivo forces and moments acting on knee joint during daily life activities were used to improve the implant design, refine the surgical instrumentation, select the optimal postoperative physiotherapy, and determine the activities that may excessively overload the implant. In other words, the in-vivo monitoring of knee forces and moments has never been used for the early detection and diagnosis of postoperative complications. Furthermore, these implants were not autonomous and powered either by miniature...