Survivorship analysis of total knee arthroplasty. Cumulative rates of survival of 9200 total knee arthroplasties
Rand, J.A.; Ilstrup, D.M.
Journal of Bone and Joint Surgery. American Volume 73(3): 397-409
1991
ISSN/ISBN: 0021-9355 PMID: 2002078 Document Number: 374468
From 1971 through 1987, 9200 total knee arthroplasties were performed at the Mayo Clinic. Actuarial analysis was used to estimate cumulative rates of survival. Use of a proportional-hazard, general linear model led to the identification of four independent variables that were associated with a significantly lower risk of failure: primary total knee arthroplasty, a diagnosis of rheumatoid arthritis, an age of sixty years or more, and use of a condylar prosthesis with a metal-backed tibial component. When all four of these favorable variables were present (without regard for radiographic changes and non-disabling symptoms), the probability of an implant being in situ was 97 per cent at both five and ten years.