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A pair of donkey engines rotated the turret through a set of gears; a full rotation was made in 22.5 seconds during testing on 9 February 1862.
An orthogonal (varimax) rotation was made to achieve a more readily interpretable factor structure.
Assessment of pelvic tilt and rotation was made in each pelvic radiograph, and in each hip joint the center-edge angle of Wiberg (1939), the acetabular index angle of Tönnis (1987), and acetabular version were assessed (using the digital distance-measuring and angle-measuring tools of the DS 3000 Workstation; Agfa Healthcare, Holte, Denmark).
The choice of principal component analysis and Varimax rotation was made because these methods typically provide clear, interpretable solutions [34] and also to allow for direct comparison with the one previous factor analysis of the US FIM + FAM by Hawley et al. [ 16].
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Measurements of internal and external rotation were made at 90° and 60° of knee flexion using 3, 6 and 9 N m torques.
The axes of the reference frames are parallel before rotation, and the first rotation is made about the z-axis by an angle ψ called yaw angle (positive in counter-clockwise direction) followed by a second rotation about the x-axis by an angle φ called roll angle.
It was found that from the [1 0 0] (0 0 1) initial state, the CET varies strongly with the substrate orientation when the rotation is made around the y-axis, whereas there is nearly no change when the rotation is performed around the x- or z-axis.
Measurements of vertebral rotation are made using the RAsag on CT as described by Aaro and Dahlborn [ 20].
Measurements of external and internal rotation were made in sitting position with the arm by the side against a folded towel with the elbow flexed to 90° and the dynamometer positioned on the distal forearm.
Analysis of completed (360°) rotations was made offline and expressed as number of turns per minute.
The rotations were made using the imwarp function with cubic interpolation.
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