Cementless prosthesis of the hip joint with "spongy metal" surface. A prospective study.
Our investigations in human specimens and animal experiments show that prostheses with a spongy metal surface can become fixed by bony ingrowth to varying degrees. After consistent clinical and radiological follow-up over 12-65 months (mean 34 months) in a prospective study of 100 consecutive patients in whom 106 cementless total hip replacements had been carried out, we were able to show that after 1 year 82% of patients were pain-free with the prosthesis fixed by bony ingrowth, 8% were pain-free with the prosthesis fixed by dense fibrous tissue and 10% were not pain-free, but did not want revision surgery. Thigh pain decreased steadily from 53% 3 months postoperatively to 6.6% 15 months after operation. We believe that, when the implantation technique is exact, a high percentage of cementless spongy metal prostheses are fixed by bony ingrowth, and that a cementless prosthesis should be implanted only in patients under 60 years of age without osteoporosis.
Plötz
W
W
Orthopaedic Department, Klinikum rechts der Isar, Technical University, Munich, Federal Republic of Germany.
Gradinger
R
R
Rechl
H
H
Ascherl
R
R
Wicke-Wittenius
S
S
Hipp
E
E
D005260:Female; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis / Q000379:methods; D006801:Humans; D008297:Male; D008670:Metals; D016348:Osseointegration; D010146:Pain; D011183:Postoperative Complications; D011446:Prospective Studies; D011859:Radiography; D013499:Surface Properties
D008670:Metals