Stability advantages of a modular total hip system.

Hip instability continues to be an infrequent, yet frustrating complication of total hip arthroplasty (THA). Restoration of normal hip anatomy and biomechanics at the time ofTHA is critical to reduce the risk of dislocation. This can be difficult in some patients due to distorted hip anatomy and wide variations in "normal" hip anatomy reported in numerous studies. Modular femoral components offer a large array of femoral offset, length, and version options which can be used independently or in combination to recreate normal osseous anatomy and a well-tensioned soft tissue envelope, which should enhance hip stability following THA.