Abstract
1) INTRODUCTION
Total knee arthroplasty (TKA) is one of the most common orthopaedic procedures performed, and is projected to exponentially increase over the next 20 years. As primary TKA cases increase, so does the frequency of revisions. The primary goals for all TKA cases include alleviating pain and improving overall knee function. The objective of this study was to evaluate the change in outcomes as measured by the Knee Society Score (KSS) between primary and revision TKA systems.
2) METHODS
This data was collected as part of three prospective, post-market, multicenter studies comparing preoperative to 6-week data. Patients were stratified into two groups based on type of single radius knee device; Posteriorly Stabilized (PS) group and Total Stabilizer (TS) group. Early clinical outcomes based on the KSS and operative data were used to compare groups.
3) RESULTS
The KSS was compared to determine the amount of improvement in revision vs. primary cases. Within the KSS Pain/Motion section, the improvement in range of motion was greatest in the TS revision group (change of 8°) in comparison to the primary PS group (change of 3°), as well as a significant decrease in pain classification. The KSS Functional scores improved significantly more in the revision group compared to the primary group.
4) DISCUSSION and CONCLUSION
Studies have determined that revision TKAs have lower rates of functional outcomes, leading to a decreasing trend in KSS. This trend can be correlated to increased difficulty of the surgical technique due to increased bone loss and anatomical changes, as well as a higher constraint in revision TKA devices. The design of a single radius knee revision system addresses these issues with revision TKA and has been shown to have comparable KSS evaluations to patients receiving primary single radius TKAs.
