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The purpose of this prospective study was to investigate the influence of body mass index (BMI) on gait parameters preoperatively and 1 year after total knee arthroplasty (TKA).Seventy-nine patients were evaluated before and 1 year after TKA using clinical gait analysis. The gait velocity, the knee range of motion (ROM) during gait, their gains (difference between baseline and 1 year after TKA), the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), quality of life, and patient satisfaction were assessed. Nonobese (BMI <30 kg/m2) and obese patients (BMI ≥30 kg/m2) were compared. Healthy controls were also assessed. Univariate and multivariate linear regression analyses were used to assess the association between gait speed and ROM gains. Adjustment was performed for gender, age, and WOMAC pain improvement.At baseline, gait velocity and knee ROM were significantly lower in obese compared with those in the nonobese patients (0.99 ± 0.27 m/s vs 1.11 ± 0.18 m/s; effect size, 0.53; P = .021; and ROM, 41.33° ± 9.6° vs 46.05° ± 8.39°; effect size, 0.52; P = .022). Univariate and multivariate linear regressions did not show any significant relation between gait speed gain or knee ROM gain and BMI. At baseline, obese patients were more symptomatic than nonobese (WOMAC pain: 36.1 ± 14.0 vs 50.4 ± 16.9; effect size, 0.9; P < .001), and their improvement was significantly higher (WOMAC pain gain, 44.5 vs 32.3; effect size, 0.59; P = .011).These findings show that all patients improved biomechanically and clinically, regardless of their BMI.

Original publication




Journal article


The Journal of arthroplasty

Publication Date





2404 - 2410


Willy Taillard Laboratory of Kinesiology, Geneva University Hospitals and Geneva University, Geneva, Switzerland; Division of Orthopaedics and Trauma Surgery, Geneva University Hospitals, Faculty of Medicine, Geneva, Switzerland.


Knee, Knee Joint, Humans, Osteoarthritis, Knee, Pain, Obesity, Body Mass Index, Gait, Range of Motion, Articular, Treatment Outcome, Arthroplasty, Replacement, Knee, Severity of Illness Index, Regression Analysis, Prospective Studies, Quality of Life, Aged, Middle Aged, Patient Satisfaction, Female, Male, Biomechanical Phenomena, Walking Speed