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Published on: January 24, 2018
Midterm results with the PFC Sigma total knee arthroplasty system
David F Dalury1, Ricardo A Gonzales, Mary Jo Adams
1Department of Orthopedic Surgery, St. Joseph's Medical Center, Baltimore, Maryland 21224-2780, USA.
The Journal of Arthroplasty
|February 19, 2008
Summary
The PFC Sigma Knee system demonstrates excellent midterm durability in total knee arthroplasty patients. This study found significant pain score improvements and no signs of implant loosening after an average 87-month follow-up.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Clinical Outcomes Research
Background:
- Total knee arthroplasty (TKA) is a common procedure for end-stage knee osteoarthritis.
- Assessing the long-term performance of specific TKA systems is crucial for clinical decision-making.
- The PFC Sigma Knee system is a cemented tricompartmental implant used in TKA.
Purpose of the Study:
- To evaluate the midterm durability and clinical outcomes of the cemented tricompartmental Sigma PFC total knee arthroplasty.
- To assess implant fixation, radiographic findings, and patient-reported pain scores following the procedure.
Main Methods:
- Prospective study of 207 patients (284 knees) undergoing TKA with the Sigma PFC system.
- Median follow-up of 87 months, including radiographic assessment and Knee Society pain scores.
- Analysis of implant type (cruciate-retaining vs. cruciate-substituting) and revision rates.
Main Results:
- No implants were radiographically loose or at risk for loosening at midterm follow-up.
- Minor, non-progressive radiolucencies were observed in a small percentage of cases.
- Significant improvement in Knee Society pain scores was documented (preoperative median 20 to postoperative median 50).
- One revision was required due to ligament disruption after a fall.
Conclusions:
- The PFC Sigma Knee system exhibits excellent midterm durability.
- The implant demonstrates reliable fixation and provides significant pain relief for patients undergoing total knee arthroplasty.
- Further long-term studies are warranted to confirm sustained performance.