Abstract
Introduction: The knee joint space is seen on anteroposterior radiograph as a radiolucent area between lower end of femur and upper end of tibia which is an indirect way of evaluating the knee cartilage thickness. 
 Objective: This study was aimed to determine the knee joint space in the medial and lateral compartments of the knee joint using digital radiograph. 
 Methodology : This was cross-sectional study. It consisted of digital radiographs of knee joint of 320 individuals. The medial and lateral joint space width of each knee joint was measured using the scale in the computerized software. 
 Results: The mean values for medial and lateral joint space widths were found to be 6.11±1.57 mm and 7.92±1.66 mm of the right knee joint respectively and 5.99±1.47 mm and 8.18±1.69 mm of the left knee joint respectively. In males, mean values for joint space widths were 6.37±1.58 mm on medial side and 8.21±1.67 mm on lateral side of the right knee; and 6.24±1.56 mm on medial side and 8.33±1.64 mm on lateral side of the left knee. In Females, these values were 5.89±1.53 mm on medial side and 7.66±1.62 mm on lateral side of the right knee; and 5.79±1.37 mm on medial side and 8.06±1.72 mm on lateral side of the left knee. 
 Conclusions: It was concluded that the lateral joint space was greater than the medial joint space in both knees. The joint space widths were found to be reasonably constant with increasing age among studied population.
Highlights
The knee is a weight-bearing largest synovial joint in the body
It was concluded that the lateral joint space was greater than the medial joint space in both knees
The joint space widths were found to be reasonably constant with increasing age among studied popula on
Summary
The knee is a weight-bearing largest synovial joint in the body It is compound type of joint as it includes two condylar joints between condyles of femur and bia; and a saddle joint between patella and the femur.[1] The distance between the distal end of femur and the proximal end of bia is known as knee joint space.[2] It is separated by ar cular car lages, menisci and with li le contribu ons from cruciate ligaments. These are collec vely seen on anteroposterior radiograph as a radiolucent area between the condyles of femur and bia.[3,4]. It has been reported to occur at a rate of 0.1 to 0.2 mm per year in pa ents with osteoarthri s.10,11
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