title: Cementless prosthesis of the hip joint with "spongy metal" surface. A prospective study.
abstract: 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.
authors.affiliation: Orthopaedic Department, Klinikum rechts der Isar, Technical University, Munich, Federal Republic of Germany.
authors.forename: W
authors.initials: W
authors.lastname: Plötz
authors.forename: R
authors.initials: R
authors.lastname: Gradinger
authors.forename: H
authors.initials: H
authors.lastname: Rechl
authors.forename: R
authors.initials: R
authors.lastname: Ascherl
authors.forename: S
authors.initials: S
authors.lastname: Wicke-Wittenius
authors.forename: E
authors.initials: E
authors.lastname: Hipp
mesh_terms: 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
chemical_list: D008670:Metals