Abstract
Abductor deficiency commonly contributes to total hip dislocation. Successful treatment of the deficiency can improve function, decrease pain, and decrease reliance on implants to cure recurrent dislocation. The defining physical exam findings are dependence on ambulatory assistive devices, severe limp, positive Trendelenberg sign, and inability to abduct against gravity.
Three techniques have been described for chronic abductor discontinuity in which the abductors have retracted or are absent and cannot reach the greater trochanter: Vastus lateralis muscle shift, Achilles tendon allograft, and gluteus maximus muscle transfer. None of the techniques were specifically performed for dislocation.
The vastus lateralis shift transfers the entire muscle proximally maintaining the neurovascular bundle. The procedure requires an incision from the hip to the knee, isolation of the neurovascular bundle, and elevation of the muscle from the femur. The authors admitted that the technique is demanding and not easily applicable to many surgeons.
Repair with an Achilles allograft requires an identifiable contractile abductor mass. The allograft is looped through the abductors to bridge the gap to the trochanter.
Two variations of a gluteus muscle transfer for abductor deficiency after total hip have been described. A portion of the gluteus maximus with its distal fascial portion are transferred to the greater trochanter. As far as dislocation is concerned an advantage of this technique is the use of the posterior maximus flap to fill a posterior and superior capsular defect not addressed with the other techniques. In addition the technique is easy to perform in almost all cases.
