Abstract Summary
The aim of this study is to validate trunk, pelvis, hip, knee and ankle kinematics assessed by an inertial sensor system in healthy controls (HC) and persons with knee osteoarthritis (KOA) during a functional movement protocol. Therefore, kinematics were compared against an optoelectronic system. The validity differs from low to excellent, and is highest in the frontal and sagittal plane. Further analysis is required to investigate the validity of more complex movement tasks.