An increasing use of short stem femoral components (SSA), in favour of conventional or “shaft” stems in THA has been reported. SSA components have been reported as bone conserving.

Shaft stems are a proven and accepted form of treatment. FEA studies predict more physiological loading of bone with SSA. Cadaver femur studies demonstrate adequate stability for bone ingrowth, more physiological loading of the femur and reduced stress shielding with SSA. Clinical studies report improved outcomes with SSA compared to shaft stems (reduced bone loss, reduced pain, reduced intra-operative complication rate, improved early rehabilitation times and reduced overall cost).

A mechanical analysis, to examine the reported improved outcomes with short stems and a rationale for the use of short stems rather than shaft stems is considered.