Intraoperative Practice Variability in Total Knee Arthroplasty.

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Abstract

[Indexed for MEDLINE] 18. J Orthop Res. 2023 Jun;41(6):1217-1227. doi: 10.1002/jor.25476. Epub 2022 Nov 12. Kinematic function of knee implant designs across a range of daily activities. Kour RYN(1), Guan S(1), Dowsey MM(2), Choong PF(2), Pandy MG(1). Author information: (1)Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria, Australia. (2)Department of Surgery, St. Vincent's Hospital, Fitzroy, Victoria, Australia. The aim of this randomized controlled trial was to measure and compare six-degree-of-freedom (6-DOF) knee joint motion of three total knee arthroplasty (TKA) implant designs across a range of daily activities. Seventy-five TKA patients were recruited to this study and randomly assigned a posterior-stabilized (PS), cruciate-retaining (CR), or medial-stabilized (MS) implant. Six months after surgery, patients performed five activities of daily living: level walking, step-up, step-down, sit-to-stand, and stand-to-sit. Mobile biplane X-ray imaging was used to measure 6-DOF knee kinematics and the center of rotation of the knee in the transverse plane for each activity. Mean 6-DOF knee kinematics were consistently similar for PS and CR, whereas MS was more externally rotated and abducted, and lateral shift was lower across all activities. Peak-to-peak anterior drawer for MS was also significantly lower during walking, step-up, and step-down (p