Fixation of cementless acetabular cups. A radiographic 4-8-year study of 102 porous-coated components.
We studied fixation changes over time in 113 porous-coated Howmedica (PCA) cementless acetabular cups inserted in 90 patients 1984-1988. The mean follow-up was 5 years. Radiographic fixation was classified as stable, fibrous-stable, or unstable. 9 cups, 3 in neutral position and 6 vertical, were revised. At follow-up, 40/75 neutral cups were stable versus 7/27 vertical cups. Most stable cups and two thirds of the unstable cups were clinically good. After the first 2 years, 28/75 neutral cups and 10/27 vertical cups changed their fixation; 12 had improved fixation and 26 had a worse one.
Cordero-Ampuero
J
J
Department of Orthopedics, La Paz Hospital, Universidad Autónoma de Madrid, Spain.
Garcia-Cimbrelo
E
E
Munuera
L
L
D000077:Acetabulum; D000328:Adult; D000368:Aged; D002484:Cementation / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography