• Min Ji Suh, Bo Ryun Kim, Sang Rim Kim, Eun Young Han, Kwang Woo Nam, So Young Lee, Yong Geun Park, and Won Bin Kim.
• From the Department of Rehabilitation Medicine, Jeju National University School of Medicine, Regional Rheumatoid and Degenerative Arthritis Center, Jeju National University Hospital, Jeju, Republic of Korea (MJS, BRK, EYH, SYL, WBK); and Department of Orthopaedic Surgery, Jeju National University School of Medicine, Regional Rheumatoid and Degenerative Arthritis Center, Jeju National University Hospital, Jeju, Republic of Korea (SRK, KWN, YGP).
• Am J Phys Med Rehabil. 2019 Oct 1; 98 (10): 897-905.

ObjectiveThe 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.DesignCross-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.ResultsIn 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.ConclusionsQuadriceps muscle strength of both knees and knee pain were important factors correlated with gait function early after total knee arthroplasty.

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