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Knee joint impedance varies substantially during physiological gait. Quantifying this modulation is critical for the design of transfemoral prostheses that aim to mimic physiological limb behavior. Conventional methods for quantifying joint impedance typically involve perturbing the joint in a controlled manner, and describing impedance as the dynamic(More)
BACKGROUND Understanding the functionality of total ankle arthroplasties (TAA) requires thorough knowledge of the kinematics during activities of daily life. Videofluoroscopy enables the in vivo measurement of the 3D kinematics of implant components more accurately than by means of skin marker tracking. The aim of the present preliminary study was to(More)
—Force (kinetic) and opto-electrical motion tracking (kinematic) measuring techniques are well established to analyse gait and other movement patterns. During the last years, video-fluoroscopy became a new and well accepted technique to get accurate kinematic information of artificial joints in vivo by a three dimensional numerical reconstruction of the(More)
— X-Ray video fluoroscopy is nowadays a common technique to retrieve in vivo 3D kinematic data of the knee joint during human motion activities. Unfortunately, since a fluoroscopic imaging system is designed to be stationary during measurement, the knee joint moves out of field of view of the fluoroscope during level walking. Therefore, it becomes(More)
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