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Purpose: The purpose of this study was to compare clinical outcomes and perform gait analysis during walking to identify differences in kinematic and kinetic parameters between two alignment methods in robotic-assisted total knee arthroplasty (TKA).Methods: Sixty patients were randomly assigned to undergo robotic-assisted TKA using either mechanical (30 patients) or kinematic (30 patients) alignment method. Clinical outcomes including varus and valgus laxities, range of motion (ROM), Hospital for Specific Surgery (HSS), Knee Society Score (KSS), and Western Ontario and McMaster Universities (WOMAC) scores and radiological outcomes were evaluated. Gait analysis of 3D spatiotemporal, kinetic, and kinematic parameters during walking was then performed for 10 age and gender matched patients of each group to determine differences between the two alignment methods.Results: The median follow-up duration of the mechanical method group was 8.7 (range 8.1-9.4) years and that of the kinematic method group was 8.4 (range 8.0-9.1) years. Clinical outcomes between the two groups showed no significant difference in HSS, WOMAC, ROM, KS pain, or function score at the last follow-up. No significant difference in varus and valgus laxity assessment, mechanical alignment of the lower limb, or perioperative complications was shown between the two groups. In gait analysis, no significant difference in kinematic or kinetic parameters was found except for varus angle (p < 0.05) and mediolateral ground reaction force (p < 0.05).Conclusions: Results of this study show that mechanical and kinematic knee alignment methods provide comparable clinical and radiological outcomes after robotic total knee arthroplasty with an average follow-up of 8 years. There were no functional difference during walking between the two alignment methods either.Level Of Evidence: II. [ABSTRACT FROM AUTHOR]

Abstract  This paper examines ship-speed performance based on acomputational method. The computations are carried out under identical model conditions, i.e., resistance and self-propulsion tests, to predict the speed-power relationship. The self-propulsion point is obtained from the self-propulsive computational results of two propeller rotative speeds. The speed-power relationship in full scale is obtained through analyzing the computational results in model scale according to the model-ship performance analysis method of ITTC’78. The object ship is a VLCC. The limiting streamlines and the distribution of the pressure coefficient on the hull, the wake characteristics on the propeller plane, and the wave characteristics around a model ship are also investigated. After completing the computations, a series of model tests are conducted to evaluate the accuracy of the predictions by comparing the computational results with the experimental results. [ABSTRACT FROM AUTHOR]