The accuracy of bony resection from patient-specific guides during total knee arthroplasty.

Purpose: In patient-specifically instrumented (PSI) total knee arthroplasty, the correlation between the pre-operative surgical plan, accuracy of the cutting block, and intra-operative resection size is unclear. The aim of this study was to evaluate the ability to accurately execute the PSI surgical plan and to add to the merging information with respect to this technology with the hypothesis that the PSI blocks would demonstrate good accuracy with regard to the bony thickness of the resections.

Methods: One hundred and thirty TKAs using PSI (MRI/long-leg radiographs) were retrospectively analysed.