الفهرس 
Relationship between symmetrical versus asymmetrical bilateral knee osteoarthritis and lumbar curvature
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Abstract
Background: Knee osteoarthritis (OA) is a major health problem worldwide that affects lumbar spine. Objective: This study was conducted to determine the relationship between symmetrical versus asymmetrical bilateral knee OA and lumbar curvature in patients with knee OA. Subjects: Sixty male patients with knee OA were selected from outpatient clinic of the Faculty of physical therapy, Cairo university. Their ages ranged from 40 to 54 years old, with a mean value of 48±3.59 years old. Methods: Patients were divided into three groups according to severity and symmetry of knee OA as follow; group (A): Twenty patients with symmetrical bilateral knee OA (both knees grade II), group (B): Twenty patients with symmetrical bilateral knee OA (both knees grade IV), and group (C): Twenty patients with asymmetrical bilateral knee OA (one knee grade II and the other knee grade IV). Grades were determined according to Kellgren and Lawrence radiological classification system of OA. A Formetric II system was used to assess the lumbar curvature (lumbar lordotic angle and lateral deviation in the three groups). Results: Regarding lumbar lordotic angle and lateral deviation, there was a statistical significant difference between the three groups (P=39.588; P=0.001) and (F=18.068; P=0.001) respectively. Regression analysis revealed that there was a statistical significant positive correlation between disease severity of knee OA and both lordotic angle, where (R²=0.559; P=0.001) and lateral deviation, where R2=0.377; P=0.001