MicroHip: A Minimally Invasive Procedure for Total Hip Replacement Surgery: A modified Smith-Petersen approach

In this article we present the surgical technique of our anterior minimally invasive approach to the hip joint. This is aligned along an interneural plane and makes the approach truly minimally invasive. This technique is performed in a lateral decubitus position on a normal operating table; there is no need for a specific orthopaedic or fracture table. As leg traction is not necessary, this enables the approach to be used routinely. Most of the instruments used for this procedure are standard instruments; only the acetabular reamers and positioners are angulated and specifically designed. The angled instruments (MI – minimally invasive) are especially useful when performing hip replacement in obese patients.

An excellent view of both the acetabulum and the proximal femur can be obtained through an incision of only 6–8cm, using this MI approach. The approach follows the interval between the tensor fascia lata muscle and the rectus muscle using a section of the anterior iliofemoral approach described by Smith-Petersen. No tendon or muscle is cut or detached. The joint capsule is split and left in place. The hip joint is not dislocated and we perform the osteotomy of the femoral neck in situ. To date we have performed over 500

MicroHip^™ operations. We have not observed any nerve lesions or fractures of the trochanter. Our experience to date shows that the method we have developed allows us to operate reliably on virtually any patient. Preliminary results also show that important factors like length of stay, pain, blood loss and return to work can be reduced significantly. The MicroHip^™ technique is being used by more and more different clinics all over the world and can be applied with success after suitable training.