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首页> 外文期刊>Gait & posture >Sensitivity of the OLGA and VCM models to erroneous marker placement: Effects on 3D-gait kinematics
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Sensitivity of the OLGA and VCM models to erroneous marker placement: Effects on 3D-gait kinematics

机译：OLGA和VCM模型对错误标记放置的敏感性：对3D步态运动学的影响

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Gait data need to be reliable to be valuable for clinical decision-making. To reduce the impact of marker placement errors, the Optimized Lower Limb Gait Analysis (OLGA) model was developed. The purpose of this study was to assess the sensitivity of the kinematic gait data to a standard marker displacement of the OLGA model compared with the standard Vicon Clinical Manager (VCM) model and to determine whether OLGA reduces the errors due to the most critical marker displacements. Healthy adults performed six gait sessions. The first session was a standard gait session. For the following sessions, 10. mm marker displacements were applied. Kinematic data were collected for both models. The root mean squares of the differences (RMS) were calculated for the kinematics of the displacement sessions with respect to the first session. The results showed that the RMS values were generally larger than the stride-to-stride variation except for the pelvic kinematics. For the ankle, knee and hip kinematics, OLGA significantly reduced the averaged RMS values for most planes. The shank, knee and thigh anterior-posterior marker displacements resulted in RMS values exceeding 10°. OLGA reduced the errors due to the knee and thigh marker displacements, but not the errors due to the ankle marker displacements. In conclusion, OLGA reduces the effect of erroneous marker placement, but does not fully compensate all effects, indicating that accurate marker placement remains of crucial importance for adequate 3D-gait analysis and subsequent clinical decision-making.
机译：步态数据必须可靠才能对临床决策有价值。为了减少标记放置错误的影响，开发了优化的下肢步态分析（OLGA）模型。这项研究的目的是评估运动步态数据对OLGA模型的标准标记位移与标准Vicon临床管理器（VCM）模型相比的敏感性，并确定OLGA是否减少了由于最关键的标记位移引起的误差。健康的成年人进行了六次步态训练。第一节是标准步态。在接下来的会议中，施加了10毫米的标记位移。收集了两个模型的运动学数据。计算相对于第一阶段的位移阶段的运动学差异的均方根（RMS）。结果表明，除了骨盆运动学以外，RMS值通常都大于跨步变化。对于脚踝，膝盖和臀部运动，OLGA大大降低了大多数飞机的平均RMS值。小腿，膝盖和大腿的前后标志位移导致RMS值超过10°。 OLGA减少了由于膝盖和大腿标记移位引起的误差，但没有减少由于踝部标记移位引起的误差。总之，OLGA可以减少错误标记放置的影响，但不能完全补偿所有影响，这表明准确的标记放置对于充分的3D步态分析和后续临床决策至关重要。

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