Figure 2 | Scientific Reports

Figure 2

From: Measurement accuracy of the acetabular cup position using an inertial portable hip navigation system with patients in the lateral decubitus position

Figure 2

The table tilt method. A gravity vector was acquired by the Navigation Device, which represented the transverse axis (b). The operating table was tilted 10° to the left and then 10° to the right (a and c). The Navigation Device acquired the orientation at each tilted position and the axis of rotation linking these two orientations was measured, which represented the longitudinal axis of the patient. The third and final axis was then calculated as being perpendicular to the first two, which represented the anteroposterior axis of the patient (the table tilt method) (b)26,27, thereby defining the functional pelvic reference plane of the patient, against which cup abduction and anteversion angles were measured.

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