Location of the ankle center for total knee arthroplasty.

Background: The purpose of this study was to investigate the ankle center position as determined from the malleoli for total knee arthroplasty (TKA).

Methods: We retrospectively analyzed computed tomography data from 102 patients with osteoarthritic knees. The tibial anteroposterior (AP) axis and transmalleolar axis (TMA) were used as rotational reference axes of the knee and ankle joint, respectively.

Comparison of MRI- and CT-based patient-specific guides for total knee arthroplasty.

Background: The patient-specific guide for total knee arthroplasty (TKA) is created from the data provided by magnetic resonance imaging (MRI) or computed tomography (CT) scans. It remains unknown which imaging technology is suitable for the patient-specific guide. The purpose of this study was to compare the accuracy of implant positioning and operative times between the two types of patient-specific guides for TKA.