Analysis Of The Medium-term Results Of Total Hip Arthroplasty

Object: To invest igate medium-term results of total hip arthroplasty(THA) for reconstruction function of hip joint. Methods: Thirty—three cases(35 hips) with THA were reviewed with an average of 82 months follow-up (range, 66 to 118 months). In this group, the primary diagnosis included avascular necrosis of femoral head(6 hips), developmental dysplasia of hip with secondary osteoarthritis(1 hips) ,Garden IV type femoral neck fracture(11 h ips), osteoarthritis(11 hips), and ankylosing spondylitis(2 hips). The clinieal results were scored with Harris method. The roentgenographic results were analyzed with Harris and Gruen methods. Results: The average Harris scores increase from 48.3 points(range, 24.2~59.5) preoperative to 83.7 points (range, 41.8~99.7) at follow-up. Roentgenographic results of femoral components showed 9 hips with radiolucent line(3 components with continuous radiolucent line, 6 components with local radiolucent). 5 hips with osteolysis in femoral ealar. Roentgenographic results of acetabular component revealed 11 hips with radiolucent line(2 components with continuous radiolucent line, 9 components with local radiolucent). Conclusion: The current study showed that the THA provides good clinical function and survival in the medium-term follow-up. The polyethylene wear debdris appears to he the major cause of osteolysis , loosening and failure of total hip arthroplasties.