TITLE:
PFC Sigma Cobalt-Chrome Total Knee Replacement: Early Outcomes Demonstrate No Significant Early Failures at the Three-Year Mark
AUTHORS:
Alexander M. Wood, Luke McIlwain, Calum H. Arthur, Stuart A. Aitken, Andre C. M. Keenan, Phil Walmsley, Ivan Brenkel
KEYWORDS:
Arthroplasty; Knee; Outcomes
JOURNAL NAME:
Open Journal of Orthopedics,
Vol.4 No.1,
January
2,
2014
ABSTRACT: The PFC Sigma Cobalt Chrome
Sigma (PFCSCC) was introduced in 2006, and represents further development of
the PFC Sigma design aiming at reducing the problem of
backside wear. To ensure that there were no significant early failures following the introduction of this
knee system to our hospital in 2006, we prospectively identified all patients undergoing TKA with the PFCSCC over a
one-year period. Clinical and demographic patient data, American Knee Society
scores, Oxford Knee scores, SF-12 scores and radiographic data were recorded
preoperatively and at three-year post
surgery. 233 patients underwent 249 primary knee arthroplasties with
the PFCSCC. Seven patients (eight TKAs) died before the last review and eight
cases were lost to follow up. Mean age was 66.7 (range 34 - 80) with 47.6% male. Mean
follow-up days were 1109 (range 741 to 1591). 5 (2.2%) were revised for
infection with 1 revised for pain. The 3-year
survival rate was 97.6% and 99.6% for aseptic failure. AKS 46.2 (0 - 95) was preoperatively 88.3 (17 - 100) with 3 years P 0.001. OKS 39.0 (22 - 53) was preoperatively 22.6 (12 - 53) with 3 years P 0.001. 17 of the 219 who had
x-rays (8%) had radiolucent zones on x-ray. Our
results demonstrate a good early aseptic survivorship of
the PFCSCC at three years of 99.6%, combined with a good functional and
objective improvement in our patients in three years.