Abstract
Eight hips (6 patients) had revision total hip arthroplasty for failed uncemented bipolar prostheses using a hemispherical porous-coated socket, a biological ingrowth anatomic system (BIAS) stem, and bone grafting. The average age was 60 years (range, 54 to 67 years), and the average follow-up period was 4 years (range, 3 to 8 years) . Eighty-seven percent of the hips were rated excellent or good according to the hip score developed by the Japanese Orthopaedic Association. No proximal migrations of the uncemented acetabular socket were seen. However, subsidence of the femoral component was seen in 2 hips. One of the stems had radiolucent lines all around the stem, with the patient complaining of occasional thigh pain. One hip dislocation and one anterior cortical penetration of the tip of the stem occurred, but these patients were asymptomatic. The current results in our series are acceptable in comparison to those in the literature. We are currently performing revision surgery with the use of a revised long-stem hip system which has improved proximal geometry to achieve a better fit and fill of the proximal aspect of the femur, utilizing a separate porous-coated metaphyseal sleeve.
