Malpositioning may result in a discrepancy between the reconstructed and the native biomechanical anatomy of the hip. Altered biomechanical properties may influence the clinical outcome and survival of implants. It has been shown that horizontal femoral offset, increases significantly more using a short femoral stem compared to conventional femoral stems. Compared to the contralateral hip, horizontal femoral offset was significantly increased only when using short stems. Increased femoral offset increases the torsion forces along the stem, which in turn raises the need for primary stability to avoid micromotion. It is also shown that a short stem has a wider range of varus-valgus in the stem-shaft axis, On the other there were found no significant differences in biomechanical reconstruction of the hip when using a "broach only" short stem, or a "ream and broach" standard stem.