After fixation of the device on the lower extremity and positioning of the patient in the starting position the device was first externally and then internally rotated at an applied torque of 5,10 and 15 Nm. To decrease the measurement error the procedure was repeated 5 times. Afterwards 5 measurements were performed by a second examiner in the same way to measure the inter-observer reliability. All 30 patients were measured again after a mean of 31 ± 43 days by the same examiners to test the intra-observer reliability. Statistical analysis was performed using the intra class correlation coefficient (ICC). Pearson correlation coefficient were used to compare the measurements of the left and the right knee.
The comparison of the measurements of the left and the right knee showed high Pearson correlation (.90) at all applied torques.
For the medial meniscus, the mean coincidence of insertion area and tunnel footprint was 88.4 ± 15.5 % for the anterior horn insertion and 60.3 ± 31.6 % for the posterior horn insertion. The mean distance between the borders of insertion area and tunnel footprint was 0.8 ± 0.8 mm for the anterior horn insertion and 2.1 ± 1.4 mm for the posterior horn insertion.