Korelasi Indeks Massa Tubuh (IMT) dengan Celah Sendi Femorotibia pada Foto Xray Genu Pasien Osteoarthritis Genu Posisi Lyon-Schuss di Rs Adam Malik Medan Tahun 2025

Abstract

Background: Knee osteoarthritis (OA) is the most common form of osteoarthritis and a frequent cause of chronic health problems. The femorotibial joint space is one of the most predictive factors associated with clinical symptoms and outcomes in patients with knee OA. Obesity is a major risk factor for the development of knee OA. Measurement of the knee joint space is most accurately performed using the Lyon-Schuss position. Methods: This study is an observational analytic study with a cross-sectional design conducted at the Radiology Department of H. Adam Malik General Hospital, Medan, from March 2025 to June 2025. The samples included patients with knee OA who met the inclusion and exclusion criteria. Radiological examinations were performed in the Lyon-Schuss position, and the narrowest femorotibial joint space was measured. Bivariate analysis using the chi-square test was employed to assess the relationship between risk factors such as age, sex, occupation, and BMI with OA grade. The Mann-Whitney U test was used to assess the relationship between femorotibial joint space width and age, sex, and occupation. The Kruskal-Wallis test was applied to evaluate the association between femorotibial joint space width and BMI as well as OA grade. Correlation analysis was then performed to determine the strength of the relationship between BMI and femorotibial joint space width. Results: Bivariate analysis showed a relationship between BMI and OA grade (p = 0.093), as well as between femorotibial joint space width and both BMI (p = 0.000) and OA grade (p = 0.000). A negative correlation was found between BMI and femorotibial joint space width, with the regression equation: y = 8.577 - 0.255x, where y represents femorotibial joint space width (mm) and x represents BMI (p = 0.000; R² = 0.306). Conclusion: There is a negative correlation between body mass index and femorotibial joint space width in patients with knee osteoarthritis.