Abstract
Aim: To analyze results of flat on flat geometry with posterior retaining arthroplasty. Materials: 469 knees were performed in patients between 1988 and 1990 done by one surgeon and followed prospectively. Survivorship analysis and log rank test were done. Assessment was done with Knee Society evaluation system. Results: The average age at surgery was 70 years. No patient was lost to follow-up. 294 were done in males and 175 in females. Osteoarthrosis was diagnosis in 445 knees (94.2%) and rheumatoid arthritis in 24 knees (5.8%). The average follow up was 10.2 years. All living patients had a minimum of 10 years of follow up. There was significant improvement in the knee score, function score and range of motion following surgery. Failure occurred in eight knees (1.7%). The survivorship analysis showed cumulative survivor of implant was 99.4% at 14 years (CI- 97.1% to 99.8%). Gender, age at surgery, and diagnosis were not significant factor in outcome. Conclusions: The geometry of flat on flat design continues to work satisfactory despite the retention of posterior cruciate at follow-up of 10 years. Results compares well reported results of more conforming designs knee arthroplasty during the same period.
Theses abstracts were prepared by Professor Dr. Frantz Langlais. Correspondence should be addressed to him at EFORT Central Office, Freihofstrasse 22, CH-8700 Küsnacht, Switzerland.
