Socket wear of Charnley low friction arthroplasty: fifteen year follow-up.
Ninety seven hips of primary Charnley low friction arthroplasty in 78 patients were followed up for fifteen to twenty one years. Survival rates calculated by clinical loosening as an end point were 89.8%, and by radiological loosening as an end point were 81.9% for fifteen years. The average rate of socket wear in ninety one of ninety seven hips was 0.11 +/- 0.09 mm per year with an ascending curve. Survival rates at fifteen year follow-up evaluation were 90.4% in the group with a socket wear rate less than 0.20 mm per year and 66.0% in the group with the rate equal to 0.20 mm or more per year. Severe socket wear correlated with radiological loosening of the socket (p<0.001), the presence of a radiolucent line or osteolysis (p<0.0001), and the younger age of the patients less than sixty years old (p<0.05).
Maruyama
M
M
Department of Orthopaedic Surgery, Shinshu University School of Medicine, Matsumoto, Japan.
Terayama
K
K
D000328:Adult; D000368:Aged; D005069:Evaluation Studies as Topic; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D013314:Stress, Mechanical