Pierre Martz1,2, Abderrahmane Bourredjem3, Jean Francis Maillefert4,3, Christine Binquet3, Emmanuel Baulot5,4, Paul Ornetti4,6,7, Davy Laroche7. 1. Department of Orthopaedic Surgery, CHU Dijon Bourgogne, F-21000, Dijon, France. martzpierre@icloud.com. 2. INSERM UMR1093-CAPS, Bourgogne Franche-Comté University, UFR des Sciences de Santé, F-21000, Dijon, France. martzpierre@icloud.com. 3. INSERM CIC1432, Clinical Investigation Centre, Clinical Epidemiology Unit, F-21000, Dijon, France. 4. INSERM UMR1093-CAPS, Bourgogne Franche-Comté University, UFR des Sciences de Santé, F-21000, Dijon, France. 5. Department of Orthopaedic Surgery, CHU Dijon Bourgogne, F-21000, Dijon, France. 6. Department of Rheumatology, CHU Dijon Bourgogne, F-21000, Dijon, France. 7. INSERM CIC1432, Plurithematic Unit, Technologic Investigation Platform, F-21000, Dijon, France.
Abstract
PURPOSE: In practice, obesity leads to poor functional outcomes after total hip arthroplasty (THA). However, in clinical research, the influence of body mass index (BMI) on the gait recovery and kinematics for THA is not well documented. The purpose of this study was to assess the influence of BMI on gait parameters pre-operatively and six months after THA for hip osteoarthritis (OA) patients. METHODS: We included 76 THA for hip OA: non-obese group (G1): 49 (BMI < 30 kg/2) and obese group (G2): 37 (BMI ≥ 30 kg/m2) with a control group of 61 healthy people. Clinical evaluation (HOOS) and a 3D gait analysis (gait speed and flexion range of the hip (ROM)) were performed before and six months after THA: The gains between the two visits were calculated and we looked for correlations between outcomes and BMI. RESULTS: Preoperative gait speed and hip ROM were significantly lower in obese patients (speed G1: 0.81 ± 0.22 m/s vs. G2: 0.64 ± 0.23 m/s, p = 0.004 and hip ROM G1: 26.1° ± 7.3 vs. G2: 21.4° ± 6.6, p = 0.005), and obese patients were more symptomatic. At six months, gait speed and hip ROM were significantly lower for all patients compared with the control group. No correlation between gait velocity, hip ROM, and BMI was found. Biomechanical and clinical gains were comparable in the two groups. CONCLUSIONS: All patients, including obese patients, have significant functional improvement after THA, objectively assessed by gait speed. Even if patients did not fully recover to the level of a healthy control person after THA, functional gain is comparable irrespective of BMI.
PURPOSE: In practice, obesity leads to poor functional outcomes after total hip arthroplasty (THA). However, in clinical research, the influence of body mass index (BMI) on the gait recovery and kinematics for THA is not well documented. The purpose of this study was to assess the influence of BMI on gait parameters pre-operatively and six months after THA for hip osteoarthritis (OA) patients. METHODS: We included 76 THA for hip OA: non-obese group (G1): 49 (BMI &lt; 30 kg/2) and obese group (G2): 37 (BMI ≥ 30 kg/m2) with a control group of 61 healthy people. Clinical evaluation (HOOS) and a 3D gait analysis (gait speed and flexion range of the hip (ROM)) were performed before and six months after THA: The gains between the two visits were calculated and we looked for correlations between outcomes and BMI. RESULTS: Preoperative gait speed and hip ROM were significantly lower in obesepatients (speed G1: 0.81 ± 0.22 m/s vs. G2: 0.64 ± 0.23 m/s, p = 0.004 and hip ROM G1: 26.1° ± 7.3 vs. G2: 21.4° ± 6.6, p = 0.005), and obesepatients were more symptomatic. At six months, gait speed and hip ROM were significantly lower for all patients compared with the control group. No correlation between gait velocity, hip ROM, and BMI was found. Biomechanical and clinical gains were comparable in the two groups. CONCLUSIONS: All patients, including obesepatients, have significant functional improvement after THA, objectively assessed by gait speed. Even if patients did not fully recover to the level of a healthy control person after THA, functional gain is comparable irrespective of BMI.
Entities:
Keywords:
BMI; Biomechanics; Gait analysis; Obese; Total hip arthroplasty
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