Can tibial coverage in total knee replacement be reliably evaluated with three-dimensional image-based digital templating?A. J. Costa, S. Lustig, C. J. Scholes, J-C. Balestro, M. Fatima, D. A. Parker
There remains a lack of data on the reliability of methods to estimate tibial coverage achieved during total knee replacement. In order to address this gap, the intra- and interobserver reliability of a three-dimensional (3D) digital templating method was assessed with one symmetric and one asymmetric prosthesis design.
A total of 120 template procedures were performed according to specific rotational and over-hang criteria by three observers at time zero and again two weeks later. Total and sub-region coverage were calculated and the reliability of the templating and measurement method was evaluated.
Excellent intra- and interobserver reliability was observed for total coverage, when minimal component overhang (intraclass correlation coefficient (ICC) = 0.87) or no component overhang (ICC = 0.92) was permitted, regardless of rotational restrictions.
Measurement of tibial coverage can be reliable using the templating method described even if the rotational axis selected still has a minor influence.