Effects of scan time (for all subjects) and the number of reconstructed frames (three subjects) on tibiofemoral kinematics. The values shown are the average (±1 s.d.) root mean square difference in joint angles and translations, with respect to a 5:00 minute scan reconstructed to 60 frames. Acceleration factors of 2, 3, and 4 correspond to simulated scan times of 2:30, 1:40, and 1:15 respectively.