Jockey Club Centre for Osteoporosis Care and Control, Public Health School, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong.
Med Biol Eng Comput. 2009 Jul;47(7):783-9. doi: 10.1007/s11517-009-0493-5. Epub 2009 May 21.
Lumbar spine kinematics was studied in subjects with normal bone mineral density, osteopenia and osteoporosis to determine the effect of bone mineral density and morphology on the flexion-extension movement patterns of the lumbar spine. Lateral radiographs and skin-mounted electromagnetic motion tracking sensors were employed to study lumbar spine kinematics using a Bayesian Belief Network model. The predicted angular displacement of the vertebrae had a high correlation (r = 0.91, p < 0.001) with the actual movements. The overall mean error was -0.51 degrees +/- 3.11 degrees. Intervertebral angular displacement and velocity consistently increased from L1/L2 to L5/S1. Differences were observed in the movement pattern between normal subjects and those with decreased bone density. In normal subjects, vertebral angular acceleration consistently decreased from the upper to the lower vertebrae but the same consistent predictable pattern was not observed in the subjects with decreased bone mineral density. It is possible that these changes in kinematic behaviours are related to morphological changes as well as altered neuromuscular functions.
研究了正常骨密度、骨量减少和骨质疏松症患者的腰椎运动学，以确定骨密度和形态对腰椎屈伸运动模式的影响。使用贝叶斯信念网络模型，通过侧位 X 光片和皮肤贴装电磁运动跟踪传感器来研究腰椎运动学。椎体的预测角位移与实际运动具有高度相关性（r = 0.91，p < 0.001）。整体平均误差为-0.51 度 +/- 3.11 度。椎间盘的角度位移和速度从 L1/L2 到 L5/S1 持续增加。在正常受试者和骨密度降低的受试者之间观察到运动模式的差异。在正常受试者中，椎体角加速度从上到下逐渐减小，但在骨矿物质密度降低的受试者中没有观察到相同的一致可预测模式。这些运动学行为的变化可能与形态变化以及神经肌肉功能改变有关。
