Image based weighted center of proximity versus directly measured knee contact location during simulated gait.
Image based weighted center of proximity versus directly measured knee contact location during simulated gait.
复制标题
模拟步态期间基于图像的加权邻近中心与直接测量的膝盖接触位置。
DOI：
10.1016/j.jbiomech.2014.04.010
复制
发表时间：
2014
影响因子：
2.4
通讯作者：
Maher,SuzanneA
中科院分区：
文献类型：
--
作者：
Wang,Hongsheng;Chen,Tony;Koff,MatthewF;Hutchinson,IanD;Gilbert,Susannah;Choi,Dan;Warren,RussellF;Rodeo,ScottA;Maher,SuzanneA
要了解膝关节损伤的机械后果，需要详细分析损伤对日常生活活动中关节接触力学的影响。三维 (3D) 膝关节几何模型与膝关节运动学相结合，使用加权邻近中心 (WCoP) 方法动态估计生理活动期间关节接触的位置。然而，估计的 WCoP 与实际接触位置之间的关系尚未定义。本研究的目的是评估使用基于图像的 WCoP 方法估计的膝关节接触位置与模拟步行过程中直接测量的加权接触中心 (WCoC) 方法之间的关系。为了实现这一目标，我们通过磁共振成像创建了六个人体尸体膝盖的膝盖特定模型。然后，所有膝盖都在旨在模拟步态的膝盖模拟器上承受生理负荷。使用运动捕捉系统捕捉膝关节运动。在整个步态中使用薄型电子传感器同步记录膝关节接触应力，并用于计算每个膝关节内侧和外侧平台的 WCoC。 WCoP 是通过将膝关节运动学与基于 MRI 的膝关节特定模型相结合来计算的。使用线性回归在整个步态中比较这两个指标。在所有标本中，WCoP 的前后位 (AP) 位置与 WCoC 在两个胫骨平台上的位置均显着相关 (p < 0.01，Pearson 系数的 95% 置信区间 > 0)，但对于 4/6 膝的中外侧 (ML) 方向，相关性不显着 (p > 0.05)。我们的研究表明，虽然使用 WCoP 方法从 3D 膝关节接触模型获得的关节接触位置与 AP 方向上的实际接触应力位置显着相关，但这种关系在 ML 方向上不太确定。
To understand the mechanical consequences of knee injury requires a detailed analysis of the effect of that injury on joint contact mechanics during activities of daily living. Three-dimensional (3D) knee joint geometric models have been combined with knee joint kinematics to dynamically estimate the location of joint contact during physiological activities—using a weighted center of proximity (WCoP) method. However, the relationship between the estimated WCoP and the actual location of contact has not been defined. The objective of this study was to assess the relationship between knee joint contact location as estimated using the image-based WCoP method, and a directly measured weighted center of contact (WCoC) method during simulated walking. To achieve this goal, we created knee specific models of six human cadaveric knees from magnetic resonance imaging. All knees were then subjected to physiological loads on a knee simulator intended to mimic gait. Knee joint motion was captured using a motion capture system. Knee joint contact stresses were synchronously recorded using a thin electronic sensor throughout gait, and used to compute WCoC for the medial and lateral plateaus of each knee. WCoP was calculated by combining knee kinematics with the MRI-based knee specific model. Both metrics were compared throughout gait using linear regression. The anteroposterior (AP) location of WCoP was significantly correlated with that of WCoC on both tibial plateaus in all specimens (p<0.01, 95% confidence interval of Pearson׳s coefficientr>0), but the correlation was not significant in the mediolateral (ML) direction for 4/6 knees (p>0.05). Our study demonstrates that while the location of joint contact obtained from 3D knee joint contact model, using the WCoP method, is significantly correlated with the location of actual contact stresses in the AP direction, that relationship is less certain in the ML direction.