Abstract
This paper discusses the construction of a monitoring unit for patients that have their hip joints replaced with a prosthesis, the objective is to monitor the stress applied on the hip joint where it alerts the patient when the levels of the load reaches critical levels thus, prolonging the life span of the prosthesis. The step reached for now is the construction of a functional telemetric system connected to three strain gauges that are to supply us with needed data for monitoring the loads, these data are processed according to simulations in FEM environments, and also from derived equations describing the relation between strain, normal stress and bending moments respectively. The telemetry is supplied with energy by induction, the antenna serves as an energy source as well as a receiver of RF signal to be processed. The next step will be clinical testing and later on is to be reduced in size to fit the prosthesis.