Abstract:

BACKGROUND: Traditional total hip arthroplasty (THA) has high early failure rate in the treatment of young patients with frequent activity. Large diameter metal-on-metal THA exhibits stability, low wearing and could become an alterative.
OBJECTIVE: To evaluate the clinical efficacy of large diameter metal-on-metal THA.
METHODS: From April 2007 to October 2009, 49 hips in 48 cases with osteonecrosis, osteoarthritis, ankylosing spondylitis, hip dysplasia, fracture of femoral neck and its complications were treated with the large diameter metal-on-metal THA in Department of Orthopaedics, Changzhou Traditional Chinese Medical Hospital. The hip function was evaluated by Harris scores. Pelvis was photographed to observe prosthesis location. All the patients were followed up after operation, and X-ray changes were compared.
RESULTS AND CONCLUSION: Patients were followed up for an average period of 20.2 months (3-34 months). There was no dislocation, infection, acetabular or femoral fracture in all patients. No radiolucent line was observed. Radiolucent line existed around acetabular prosthesis in two hips. One patient developed groin pain after the operation and sound around the joint appeared in two patients. The average Harris score was 96 in the latest follow-up with an excellent and good rate of 100%. Results showed that the large diameter metal-on-metal THA is effective for the patients with osteonecrosis, osteoarthritis, ankylosing spondylitis, hip dysplasia, fracture of femoral neck and its complications. The short-term results are satisfied.