Ten-year evaluation of geometric total knee arthroplasty.
One hundred ninety-three geometric total knee arthroplasties (TKA) were performed between 1972 and 1975 in 129 patients (66 women, 63 men; mean age, 69 years) with osteoarthritis. Of these, 102 knees were followed for a mean of 11 years. Eighty-three percent of the patients had mild or no pain. The revision rate was 20%, and the surgical complication rate was 12%. By actuarial analysis, the probability of retaining a geometric prosthesis at 10 years was 78%. With revision or moderate to severe pain as the end point, the predicted implant survival was 69% at 10 years. Lucent lines greater than 1 mm were present in 38% of the knees and progressed in 34%; they were more frequent in knees with greater than or equal to 3 degrees of varus axial alignment (p less than 0.05) or greater than or equal to 4 degrees of varus placement of the tibial component (p less than 0.05). The geometric prosthesis has provided a functional result in 69% of knees at 10 years, despite being the first two-part component knee replacement retaining the cruciate ligaments and using early surgical instrumentation and implant design.
Rand
J A
JA
Department of Orthopedics, Mayo Clinic, Rochester, Minnesota 55905.
Coventry
M B
MB
D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008124:Locomotion; D008297:Male; D009068:Movement; D010003:Osteoarthritis / Q000601:surgery*; D010146:Pain / Q000503:physiopathology; D011183:Postoperative Complications / Q000209:etiology; D011336:Probability; D011474:Prosthesis Design; D012086:Reoperation