In the total hip arthroplasty, the surgeon applies impact forces using a mallet while performing broaching, which is the process of preparation of the femoral canal. Understand the order of magnitude of these forces it is important to study new methods of broaching, such as instruments with controlled impaction, and avoid possible complications during surgery. In the literature were developed test benches that replicate impaction conditions, using cadaveric bones stripped of soft tissue or polyurethane bones. The bones are usually fixed to laboratory benches of unknown stiffness and the hammer tip is instrumented with a load cell. The aim of the first part of the thesis is to study the state of the art of test benches that measure the femur impact forces during surgery, to find the specifications necessary to build one, with the focus on the load cell.