Static imaging has been commonly and clinically accepted to assess the severity of medial
knee osteoarthritis (KOA), especially the radiography. Gait analysis has been adopted to
evaluate the kinematic characteristics of the knees in patients with KOA. Most of the current
studies focus on the sagittal plane of the knee, but very few of them focus on the frontal or
horizontal plane. With the different severity of medial KOA, anatomical structures of the
knees will change and influence kinematics of the knees, such as osteophytes and deformity.
At present, there has been no study focusing on the relations between the imaging assessment
of the severity and quantitative kinematics of medial KOA. The aim of the study is to explore
the relationship between the imaging assessment based on the Kellgren-Lawrence Scores and in
vivo 3D knee kinematic characteristics in Chinese patients with medial KOA during walking
using a new portal gait system.