Femoral Offset and Hip Function in Total Hip Prosthesis

The femoral offset is the most important prognostic element in hip arthroplasty. Its restoration is crucial. Any change in the native value of the offset affects the quality of clinical function of the hip. The aim of our study was to evaluate the clinical function of the hip based on the value of the femoral offset after arthroplasty. This is a retrospective study conducted between 2010 and 2013, involving 27 patients who underwent total hip arthroplasty. Patients who had previous surgical procedures on the same hip or on the contralateral hip were excluded. Measurements were taken from standard hip radiographs in approximately 15° internal rotation, with magnification at 100%. Clinical results were assessed using the WOMAC score, which averaged 15.2 points, and the Merle d'Aubigné-Postel score, with an average of 15 points. Two other tests were also evaluated in our study, the step and hop tests were used. The best functional results were obtained in patients who had a lateralization of the femoral stem with an increased offset.