Anthropometric and Q angle assessment in obese women with knee osteoarthritis

Abstract

Osteoarthritis (OA) is a degenerative joint disease characterized by inflammatory process, pain, and deformity; one of its main predictive factors is obesity. The aim of this study was to search for possible correlations between anthropometric measures, the Q angle and knee osteoarthritis. A sample of 50 obese women (30 with knee osteoarthritis and 20 with no joint disease), aged between 40 to 60 years, were assessed as to BMI (body mass index), abdominal circumference (AC), waist and hip perimeters (so as to calculate waist-hip ratio), and the Q angle; osteoarthritis was diagnosed by clinical exam and knee joint radiography. Results showed a positive, poor correlation between BMI and Q angle, as well as between time of obesity onset and degree of joint degeneration. AC was found to positively, though weakly, correlate with the degree of joint degeneration and of OA severity. Adjusted odds ratio for OA showed that women with BMI>;34 kg/m² and AC>;110 cm were respectively 3.7 and 7 times more likely to develop OA. The degree and duration of central obesity possibly contribute to incidence of knee OA in obese women. Abdominal circumference was the measure that most correlated with the degree of joint degeneration and of OA severity, which suggests it should be used in clinical evaluation.