Femoral–tibial contact stresses on fixed rotational femur models

ObjectivesThis study aims to quantitatively evaluate the femoral–tibial contact pressure on the knee under certain malrotaional degrees.MethodsFemoral–tibial contact pressure was carried out on 14 fixed rotational knee models under 200/400/600 N vertical load using ultra-low-pressure sensitive film technology, rotation angles including neutral position (0°, anatomically reduced), 5°, 10°, and 15° internally and externally. Data were collected and analyzed with SPSS software.ResultsThere are significant statistical differences between the medial contact pressure among rotational deformities (including neutral position) (P 0.05). In the comparison of medial to lateral contact pressures, no statistically significant differences were found in neutral and 5° internal rotation under 200/400 N, neutral, 5° internal rotation, and 15° external rotation under 600 N. In contrast, medial contact pressures were higher than lateral at other angles (P