Long-term followup of anatomic graduated components posterior cruciate-retaining total knee replacement

Citation
Ma. Ritter et al., Long-term followup of anatomic graduated components posterior cruciate-retaining total knee replacement, CLIN ORTHOP, (388), 2001, pp. 51-57
Citations number
19
Categorie Soggetti
Ortopedics, Rehabilitation & Sport Medicine","da verificare
Journal title
CLINICAL ORTHOPAEDICS AND RELATED RESEARCH
ISSN journal
0009921X → ACNP
Issue
388
Year of publication
2001
Pages
51 - 57
Database
ISI
SICI code
0009-921X(200107):388<51:LFOAGC>2.0.ZU;2-T
Abstract
The purpose of the current study was to evaluate the authors' 15-year exper ience with the Anatomic Graduated Components total knee replacement. This i s a report of the survivorship of 4583 Anatomic Graduated Component total k nee arthroplasties. Kaplan-Meier survival analyses were performed with the end point defined as radiographic loosening, revision, or both. This end po int was subdivided into the best case scenario in which it was assumed that all the patients lost to followup were doing well throughout the study and a worst case scenario in which it was assumed that all patients lost to fo llowup had failed results at their last clinic visit. There were six (0.18% ) femoral, 21 (0.46%) tibial, and 180 (4.2%) all-polyethylene patellar comp onent failures secondary to aseptic loosening. All femoral components and 9 0% of the tibial components were revised; however, only 15 patellar compone nts were revised. The clinical survival rate with revision of one or more o f the components was 98.86% at 15 years. Despite having nearly flat-on-flat geometry and retaining the posterior cruciate ligament, which should incre ase the stresses in the polyethylene and at the bone-cement interface, this total knee replacement has proved to have minimal wear and excellent longe vity with time. The authors think this is a result of the direct compressio n molded polyethylene articulation and the nonmodular configuration that in corporates metal backing on the tibial component and eliminates back-sided tibial component polyethylene wear.