title: Low contact stress mobile bearing total knee arthroplasty: results at 5 to 13 years.
abstract: A total of 139 mobile bearing knee arthroplasties in 104 patients were evaluated at a mean follow-up of 7.8 years (range, 5-13 years). There were 80 cemented knees, 50 uncemented, and 9 hybrid (cemented tibia, uncemented femur). Ten knees were revised. Four knees were revised for aseptic loosening of an uncemented tibial component, and 1 knee was revised for loosening of an uncemented femoral component. One knee was revised for a recurrent dislocating bearing, and 1 knee was revised for instability. No mechanical loosening occurred in the cemented components. Three knee arthroplasties were revised for infection. A total of 66 patients (92 knees) were evaluated clinically and radiographically. Radiographic evaluation showed a 27% incidence of radiolucent lines for the femur and a 31% incidence of radiolucent lines for the tibia. No components were considered radiographically loose. The survivorship of mobile bearing knee arthroplasties was 93% at an average follow-up of 7.8 years. Aseptic loosening was statistically higher in uncemented components (P=.0051).
authors.affiliation: Division of Orthopaedic Surgery, Department of Surgery, University of Kentucky Medical Center, Lexington, Kentucky 40536, USA. Hartfor@pop.uky.edu
authors.forename: J M
authors.initials: JM
authors.lastname: Hartford
authors.forename: T
authors.initials: T
authors.lastname: Hunt
authors.forename: H
authors.initials: H
authors.lastname: Kaufer
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000601:surgery; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D011475:Prosthesis Failure; D012086:Reoperation; D018709:Statistics, Nonparametric; D016896:Treatment Outcome; D016474:Weight-Bearing / Q000502:physiology*