Mid-term results show no significant difference in postoperative clinical outcome, pain and range of motion between a well-established total knee arthroplasty design and its successor: a prospective, randomized, controlled trial - Report - MDSpire
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Mid-term results show no significant difference in postoperative clinical outcome, pain and range of motion between a well-established total knee arthroplasty design and its successor: a prospective, randomized, controlled trial
Mid-term RCT shows no outcome differences between PFC Sigma and Attune TKA systems
Overview
A randomized controlled trial comparing the traditional PFC Sigma total knee arthroplasty (TKA) system with the newer Attune TKA system found no significant differences in postoperative outcomes, pain levels, or range of motion at 2-year follow-up. Both implants demonstrated similar clinical effectiveness despite design modifications intended to improve patient satisfaction.
Background
Total knee arthroplasty is an effective treatment for severe osteoarthritis, yet up to 20% of patients continue to experience postoperative pain. The PFC Sigma system is widely used globally but has been associated with dissatisfaction at short- to mid-term follow-ups. The Attune system was developed to address these issues by improving femoral sizing and patellofemoral tracking. However, prior to this study, no prospective randomized trials had directly compared these two commonly used implants.
Data Highlights
Outcome Measure
Attune Group (n=80)
PFC Sigma Group (n=78)
Significance
Knee Society Knee Score (KS)
Improved postoperatively (mean ± SD)
Improved postoperatively (mean ± SD)
NS
Knee Society Function Score (FS)
Improved postoperatively (mean ± SD)
Improved postoperatively (mean ± SD)
NS
WOMAC Score
Improved postoperatively (mean ± SD)
Improved postoperatively (mean ± SD)
NS
Visual Analogue Scale (VAS) for pain
Reduced postoperatively (mean ± SD)
Reduced postoperatively (mean ± SD)
NS
Range of Motion (ROM)
Improved postoperatively (mean ± SD)
Improved postoperatively (mean ± SD)
NS
Key Findings
No statistically significant differences were found between the Attune and PFC Sigma groups in Knee Society Scores, WOMAC scores, VAS pain scores, or range of motion at 2 years postoperatively.
Both groups showed significant improvements from baseline in all measured clinical outcomes.
The Attune system's design modifications did not translate into superior clinical outcomes compared to the established PFC Sigma system.
Patient demographics and baseline characteristics were comparable between groups, minimizing confounding factors.
There were no reported revisions or implant-related complications in either group during the follow-up period.
Clinical Implications
Clinicians can expect comparable mid-term functional outcomes and pain relief using either the traditional PFC Sigma or the newer Attune TKA systems. The choice of implant may therefore be guided by surgeon preference, cost considerations, or other factors rather than anticipated differences in clinical effectiveness. Continued monitoring and longer-term studies are warranted to confirm these findings over extended follow-up.
Conclusion
This randomized controlled trial demonstrates that the Attune TKA system does not provide superior mid-term clinical outcomes compared to the PFC Sigma system. Both implants remain viable options for primary total knee arthroplasty with similar postoperative results.
References
National Arthroplasty Registry Data -- PFC Sigma Usage and Outcomes
DePuy Synthes 2013 -- Introduction of Attune TKA System
Knee Society Scores and WOMAC -- Clinical Outcome Measures
Study Protocol -- Randomized Controlled Trial Comparing PFC Sigma and Attune
