摘要
Rotational knee laxity is known as an intrinsic risk factor for anterior cruciate ligament injury.However,there was no convenient way to measure rotational range of motion.To this end,we developed the RotorMeter,a non-invasive external device intended to measure rotational range of motion of the knee.The purpose of this study is to use the RotorMeter to clarify the characteristics pertaining to the rotational range of motion of knee in healthy participants under varying conditions.A total of 23 healthy participants participated in the study.Torques of 2.5,5.0,and 7.5 Nm were applied at 90°,60°,and 30°angles of knee flexion to measure the rotational range of motion of knee using the RoterMeter.Female participants showed larger rotational range of motion than the males,and no laterality was observed at any flexion angle and applied torque.When different torques were applied at the same flexion angle,rotational range of motion significantly increased at all flexion angles with increased torque.When the same torque was applied at different flexion angles,no significant difference in rotational range of motion was observed at any of the flexion angles.
