Objective The aim of this study was to determine the correlations between objective performance-based physical function, self-reported physical function, quality of life, and gait function at 1 mo after unilateral total knee arthroplasty. Design Cross-sectional data from 195 patients who underwent unilateral primary total knee arthroplasty were analyzed. The isometric knee extensor and flexor strength of both knees, gait parameters, 6-min walk test, timed up-and-go test, timed stair-climbing test, knee flexion and extension range of motion of surgical knee, Western Ontario McMaster Universities Osteoarthritis Index pain, stiffness, and functional levels, EuroQol five-dimensions questionnaire, and visual analog scale for knee pain were assessed. Results In bivariate analyses, both postoperative gait speed and gait endurance had significant positive correlations with postoperative peak torque of the extensor and flexor of both knees, cadence, stride length, and significant negative correlation with timed up-and-go, stair-climbing test ascent, stair-climbing test descent, visual analog scale, Western Ontario McMaster Universities Osteoarthritis Index pain, stiffness, and function levels. In the linear regression analyses, postoperative peak torque of the extensors of both knees and VAS for knee pain were factors correlated with postoperative gait speed and gait endurance. Conclusions Quadriceps muscle strength of both knees and knee pain were important factors correlated with gait function early after total knee arthroplasty.
Background: This study aimed to identify the preoperative physical performance factors that predict gait speed and endurance 1 month after total knee arthroplasty (TKA). Methods: This prospective cohort study included all patients who underwent unilateral primary TKA in December 2014-2016. Before and at 1 month after TKA, gait variables, bilateral isometric knee extensor and flexor strength, and range of motion (ROM) (flexion and extension) of the operated knee were measured; further, a 6-minute walk test (6MWT), a Timed Up and Go (TUG) test, and a stair-climbing test (SCT) were conducted. The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), the EuroQoL 5-dimension (EQ-5D) questionnaire, and the visual analogue scale (VAS) of knee pain were also completed. Results: A total of 84 patients were included. Bivariate analyses showed that postoperative gait speed significantly and positively correlated with preoperative gait speed, gait cadence, ROM of knee flexion, and 6MWT, but significantly and negatively correlated with age and preoperative TUG test, SCT-descent, WOMAC-Function score, and VAS score. The postoperative 6MWT significantly and positively correlated with preoperative gait cadence and 6MWT, but significantly and negatively with preoperative body mass index (BMI), TUG test, SCT-ascent, and WOMAC-Function score. Linear regression analyses showed that age, preoperative ROM of knee flexion, and TUG test were independent predictors of postoperative gait speed, while preoperative BMI and 6MWT predicted postoperative 6MWT. Conclusion: These preoperative predictive factors will be useful in developing pre-and postoperative rehabilitation strategies aimed at improving gait function in the early stages after TKA.
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