Total Hip Arthroplasty for Acetabular Dysplasia

Objective: To study and discuss the install methods of hip prosthesis while perform a total hip arthroplasy for hypoplastic acetabulum. Methods: For 15 patients amount to 22 joints of osteoarthrasis due to hypoplasia of acetabulum, the authors adopted 3 methods to perform the total hip arthroplasty according to the developmental degree of acetabulum, which were implant bone on external upper lip of acetabulum, deepen acetabulum and slightly inward depening acetabulum. Took a X-ray photo for both joints with the same radiological condition in order to learn the installing angel of acetabulum and the coalescence of acetabulum with its bone bed after 3,6,9,12 months and every half a year of the operation.The average follow-up term were 24 months. Results:By follow-up, it was found that the acetabulum contacted well with its bed, the angle and the recovery of joint function was satisfied among the cases given the operation methods of deepen acetabulum and slightly inward deepened acetabulum. In the case of implanted bone on external upper lip of acetabulum, there was a zona pellucida between the implanted bone and the artificial acetabulum after 2 years of the operation. Conclusion: While performing total hip arthroplasty, various methods should be adopted according to the condition of the bed of acetabulum for the joints of osteoarthrasis due to hypoplasia of acetabulum. For the case of acetabulum shallowed and too much bone at the bottom of acetabulum bed, the surgeons should install the acetabulum by wear the acetabulum inward and deepen it. Be ware of not wearing the acetabulum too deeply to affecting the stability of the inner wall of acetabulum.