Background:Several studies have shown that there is a link between body mass index (BMI) and painful foot imputed to a biomechanical change in foot structure [1].Objectives:Our objective was to study the association between BMI and static foot disorders in gonarthrosic subjects.Methods:It was a prospective descriptive study conducted in the rheumatology department of the Mohamed Kassab Institute of Orthopedics with 60 patients with Gonarthrosis. The socio-demographic data of the patients were studied. BMI was calculated for all patients. Static foot disorders have been studied.Results:Sixty patients were included, 83.3% of whom were female. The average age was 55.2 years [38-78 years]. The disease has been evolving for an average of 6 years [1-13 years]. The lesion was bilateral in 80% of cases, the average body mass index was 30.4 kg / m2 [24-36]. Knee arthritis was classified as stage I, II and III according to the Kellgren and Lawrence classification in 18.5%, 55.6% and 25.9% of patients respectively. The foot examination involved 108 gonarthrosic limbs. Examination of the integuments showed hyperkeratosis in 94.4% of the cases (79.6% calluses and 83.3% callosities). Forefoot deformities were Hallux valgus (HV) in 52.8% of cases and overlapping toes in 18.5% of cases. Pronation deformity using the Foot Posture Index (FPI) was found in 51.9% of cases. Abnormal lowering of navicular bone was noted in 51.9%. The podoscopic impression revealed flat feet in 73.2% of the cases.A statistically significant association was found between BMI and the presence of calluses (31.21 ± 2.897 vs26.83 ± 1.425, p <0.001), with HV (31.37 ± 3.086 vs29.49 ± 2.969, p = 0.002), at the overlap of the toes (33.2 ± 1.361vs29.86 ± 1.130, p <0.001), with the lowering of the navicular bone (31.17 ± 2.885vs29.68 ± 3.304, p = 0.015), FPI (p = 0.003) and flat podoscopic impression (p <0.001).Conclusion:BMI is strongly associated with static feet disorders in gonarthrosic patients by aggravating the postural changes in the foot caused by knee osteoarthritis [2]. Obesity is associated mainly with the existence of flat feet, pronation of the foot, toes deformities and hyperkeratosis.References:[1]Steele JR, Mickle KJ, Munro B. Fat flat frail feet: how does obesity affect the older foot. XXII Congress of the International Society of Biomechanics; 2009[2]Norton AA, Callaghan JJ, Amendola A, Phisitkul P, Wongsak S, Liu SS, et al. Correlation of knee and hindfoot deformities in advanced knee OA: compensatory hindfoot alignment and where it occurs. Clin Orthop Relat Res. 2015;473(1):166-74Disclosure of Interests:None declared
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