RT Journal Article
SR Electronic
A1 Mu Heo, Hyun
A1 Eel Oh, Seung
A1 Woo Suh, Seung
A1 Hyuk Yang, Jae
A1 Hyun Youn, Su
A1 Sim, Taeyong
A1 Hwan Mun, Joung
T1 Estimation of the spinal twisting angle using inertial measurement units during a rod derotation surgery in idiopathic scoliosis patients
JF Journal of Applied Biomedicine
YR 2015
VO 13
IS 2
SP 143
OP 159
DO 10.1016/j.jab.2015.01.001
UL https://jab.zsf.jcu.cz/artkey/jab-201502-0007.php
AB This study proposes a method to measure the twisting angle of a rod during a spinal correction surgery in real-time without performing an alignment procedure by using the six-axis data (tri-axis acceleration, tri-axis rate gyro) of the IMU and a Tait-Bryan Euler angle algorithm. To determine whether the twisting angle calculation algorithm offered an improvement, typical procedures described in existing studies were implemented using the same experimental data and were then validated using a three-dimensional motion analysis system (Vicon 460 motion analysis system). The correlation coefficients and the RMSE of the proposed method were 0.904 and 0.680° in the servo-motor experiment, and 0.988 and 0.691° in the mock surgery experiment, respectively, and these values were not significantly different from those calculated through other methods in previous studies. Therefore, if the proposed method is used during surgery, an alignment procedure and the assumptions following the morphology of body, which are limitations of prior research, are not necessary. Also the twisting angle of the rod can be observed without using magnetic data of IMU in real time during surgery. It is expected that the correction loss, which is a serious problem that can occur in patients after spinal correction, could be prevented.