Are Lower-limb Alignment Values on CT-Scanograms Comparable with Weight-bearing Long Leg Radiographs in Pre- and Post-operative Total Knee Replacements

Description

This presentation by Dupinderjit Singh Rye discusses a comparative study of imaging modalities for assessing lower limb mechanical axis in total knee replacements. It focuses on the efficacy of CT scans versus weight-bearing lower limb long leg X-rays, noting that the mechanical axis impacts component survivorship and patient-reported outcome measures (PROMs). The study aims to evaluate the accuracy and comparability of these two imaging types, based on the investigation of 140 radiographs and CT scans, analyzed through statistical methods including Spearman's correlation and Bland-Altman charts.



The results reveal a strong correlation between preoperative and postoperative CTs and X-rays, with no statistically significant difference in measuring hip-knee-ankle alignment. The data suggests that both modalities can be used interchangeably due to their comparable precision and accuracy. However, the presentation acknowledges certain limitations, including variances due to the different protocols of imaging acquisition. During the subsequent Q&A, the audience inquires about technical specifics of image acquisition and the implications of weight-bearing versus non-weight-bearing imaging on knee rotations, highlighting areas for further research and validation in ongoing studies.

DOI: 10.1302/3114-221054

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