Dynamic CT scanning of the knee: Combining weight bearing with real-time motion acquisition
journal contributionposted on 2023-09-13, 15:01 authored by Luca Buzzatti, Benyameen Keelson, Joris Willem van der Voort, Lorenzo Segato, Thierry Scheerlinck, Savanah Héréus, Gert Van Gompel, Jef Vandemeulebroucke, Johan De Mey, Nico Buls, Erik Cattrysse, Ben Serrien
BackgroundImaging the lower limb during weight-bearing conditions is essential to acquire advanced functional joint information. The horizontal bed position of CT systems however hinders this process. The purpose of this study was to validate and test a device to simulate realistic knee weight-bearing motion in a horizontal position during dynamic CT acquisition and process the acquired images.
Methods"Orthostatic squats" was compared to "Horizontal squats" on a device with loads between 35% and 55% of the body weight (%BW) in 20 healthy volunteers. Intraclass Correlation Coefficient (ICC), and standard error of measurement (SEM), were computed as measures of the reliability of curve kinematic and surface EMG (sEMG) data. Afterwards, the device was tested during dynamic CT acquisitions on three healthy volunteers and three patients with patellofemoral pain syndrome. The respective images were processed to extract Tibial-Tuberosity Trochlear-Groove distance, Bisect Offset and Lateral Patellar Tilt metrics.
ResultsFor sEMG, the highest average ICCs (SEM) of 0.80 (6.9), was found for the load corresponding to 42%BW. Kinematic analysis showed ICCs were the highest for loads of 42%BW during the eccentric phase (0.79-0.87) and from maximum flexion back to 20° (0.76). The device proved to be safe and reliable during the acquisition of dynamic CT images and the three metrics were computed, showing preliminary differences between healthy and pathological participants.
ConclusionsThis device could simulate orthostatic squats in a horizontal position with good reliability. It also successfully provided dynamic CT scan images and kinematic parameters of healthy and pathological knees during weight-bearing movement.
Publication titleThe Knee
- Published version
Item sub-typeJournal Article
Media of outputPrint-Electronic
- School of Allied Health Outputs