Novel device for lower limb weight-bearing dynamic ct: a 3d knee kinematic analysis

One of the main limitation of CT imaging and especially Dynamic CT acquisitions of the lower limb is the unavailability of devices that create weight-bearing (WB). This study aimed to validate a novel device developed for this proposes. 15 healthy subjects performed a series of orthostatic squats, followed by a series of “horizontal” squats on the device at different resistances based on body weight percentage (BW%). 3D-kineamtics and surface EMG were recorded. To explore the degree of similarity between both settings, the 3D-kinematics of left knees were compared using Linear Fit Method and mean differences. Very high average correlation was found for most BW%. Average rotational differences were below 10˚ for nearly all components. The novel device seems able to replicate knee kinematics when compared to a true orthostatic wall squat.