Assessing Total Knee Arthroplasty Fixation Strength Using Inducible Displacement Measurements From Weight-Bearing CT-Based Radiostereometric Analysis

Description

The presentation discusses advancements in total knee arthroplasty (TKA), including improvements in implant designs and surgical techniques. A significant issue that remains is the problem of aseptic loosening post-operation. The presenter introduces RSAs (Radiostereometric Analyses) as the gold standard for assessing implant fixation, but notes that traditional RSA techniques are limited to research populations due to the need for pre-inserted bone markers, highlighting a gap for broader clinical application.



The study's objective is to compare conventional RSA methods with a weight-bearing CT-based RSA approach in assessing implant fixation five years post-patellar component arthroplasty (PCA). The study involved 17 patients who underwent TKA, focusing on longitudinal migration and both unloaded and loaded implant assessments to gauge fixation stability.



Results indicate that most implants remained stable after five years, but one was categorized as a continuous migrator. Precision analysis showed no significant differences in translations between the two techniques, although some differences in rotations were noted. Inducible displacement results demonstrated that weight-bearing CT RSA captured significant translations and rotations compared to traditional methods, suggesting it may offer better insight into component stability.



The findings support future clinical applications of weight-bearing RSA due to its accessibility and precision, paving the way for further research on implant loosening.

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