Department of Joint Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 222 West Huanhu Third Road, Pudong New Area, Shanghai, 201306, China.
College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 10083, China.
BMC Musculoskelet Disord. 2023 Jun 3;24(1):452. doi: 10.1186/s12891-023-06437-3.
The lower limb mechanical axis was used to assess the severity of knee osteoarthritis (KOA) with varus/valgus deformity and the accuracy of targeted lower limb alignment correction after operation by conventional X-rays. There are lots of parameters to assess the gait in elder patients such as velocity, stride length, step width and swing/stance ratio by knee joint movement analysis system. However, the correlation between the lower limb mechanical axis and gait parameters is not clear. This study is aimed at obtaining the accuracy of the lower limb mechanical axis by the knee joint movement analysis system and the correlation between the lower limb mechanical axis and gait parameters.
We analysed 3D knee kinematics during ground gait of 99 patients with KOA and 80 patients 6 months after the operations with the vivo infrared navigation 3D portable knee joint movement analysis system (Opti-Knee®, Innomotion Inc, Shanghai, China). The HKA (Hip-Knee-Ankle) value was calculated and compared to X-ray findings.
HKA absolute variation after the operation was 0.83 ± 3.76°, which is lower than that before the operation (5.41 ± 6.20°, p = 0.001) and also lower than the entire cohort (3.36 ± 5.72). Throughout the cohort, a significant correlation with low coefficients (r = -0.19, p = 0.01) between HKA value and anterior-posterior displacement was found. In comparing the HKA values measured on the full-length alignment radiographs and 3D knee joint movement analysis system (Opti-Knee), there was a significant correlation with moderate to high coefficients (r = 0.784 to 0.976). The linear correlation analysis showed that there was a significant correlation between the values of HKA measured by X-ray and movement analysis system (R = 0.90, p < 0.01).
Data with equivalent results as HKA, the 6DOF of the knee and ground gait data could be provided by infrared navigation based 3D portable knee joint movement analysis system comparing with the conventional X-rays. There is no significant effect of HKA on the kinematics of the partial knee joint.
下肢机械轴被用于评估有内翻/外翻畸形的膝骨关节炎（KOA）的严重程度，以及传统 X 射线术后对下肢对线的精确靶向矫正。膝关节运动分析系统可以评估老年患者的步态，例如速度、步长、步宽和摆动/站立比例等参数。然而，下肢机械轴与步态参数之间的相关性尚不清楚。本研究旨在通过膝关节运动分析系统获得下肢机械轴的准确性，并研究下肢机械轴与步态参数之间的相关性。
我们使用 vivo 红外导航 3D 便携式膝关节运动分析系统（Opti-Knee®, Innomotion Inc，上海，中国）对 99 例 KOA 患者和 80 例术后 6 个月患者的地面步态进行了 3D 膝关节运动学分析。计算 HKA（髋-膝-踝）值并与 X 线结果进行比较。
术后 HKA 绝对值变化为 0.83±3.76°，低于术前（5.41±6.20°，p=0.001）和全队列（3.36±5.72°）。在整个队列中，HKA 值与前后位移之间存在显著的低度相关关系（r=-0.19，p=0.01）。比较全长对线 X 线片和 3D 膝关节运动分析系统（Opti-Knee）测量的 HKA 值，具有中度至高度相关系数（r=0.784 至 0.976）。线性相关分析表明，X 射线和运动分析系统测量的 HKA 值之间存在显著相关性（R=0.90，p<0.01）。
与传统 X 射线相比，基于红外导航的 3D 便携式膝关节运动分析系统可以提供等效的 HKA 值、膝关节的 6 自由度和地面步态数据。HKA 对膝关节的运动学没有显著影响。
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