Abstract
Total knee arthroplasty (TKA) is reliant on safe and effective implants. The Press
Fit Condylar Sigma Cobalt–Chrome (PFCSCC) was introduced in 2006, but no reports have
examined long-term failure rates and patient-reported outcome measures (PROMs). The
primary aim of this study was to assess survival outcomes of the PFCSCC at 10 years
after implantation. Prospective data collection was performed on all patients undergoing
primary TKA in one orthopaedic department using this prosthesis exclusively from February
1, 2006, to January 31, 2007. Follow-up was at 10 years. Survival analysis was performed
using two primary outcome measures: (1) all-cause joint revision and (2) aseptic revision.
Secondary outcomes measures included the American Knee Society Score (AKSS) and Oxford
Knee Score (OKS). In total, 249 knees of 233 patients underwent primary TKA. Mean
patient age was 66.7 years (range 34–80), and mean body mass index (BMI) was 30 kg/m2 (20.7–40.1). Reviewing all causes of revisions, 14 joints (5.6%) of 14 patients required
reoperation. Of these, nine were for deep infection, including six in the first year.
Four (1.6%) underwent aseptic revision. Mean AKSS changed from 47.6 to 90.4 (n = 140; p < 0.001) at 10 years, and mean OKS changed from 38.3 to 23.2 (n = 149; p < 0.001). Prospective analysis of consecutive TKA cases using this design of prosthesis
demonstrated high survival rates of 94.4% (all-cause revision) and 98.4% (aseptic
revision) at 10 years. Postoperative gains in PROMs were sustained at 10 years. These
real-world data represent a substantial extension to previous reports for the PFCSCC
and suggest that it is not prone to late mechanical failure.
Keywords
total knee arthroplasty - survivorship - revision - patient reported outcome measures
