Abstract
An inverse kinematic model is presented that was employed to determine the optimum intervertebral joint configuration for a given forward-bending posture of the human trunk. The lumbar spine was modelled as an open-end, kinematic chain of five links that represented the five vertebrae (L1–L5). An optimisation equation with physiological constraints was employed to determine the intervertebral joint configuration. Intervertebral movements were measured from sagittal X-ray films of 22 subjects. The mean difference between the X-ray measurements of intervertebral rotations in the sagittal plane and the values predicted by the kinematic model was less than 1.6°. Pearson product-moment correlationR was used to measure the relationship between the measured and predicted values. TheR-values were found to be high, ranging from 0.83 to 0.97, for prediction of intervertebral rotation, but poor for intervertebral translation (R=0.08–0.67). It is concluded that the inverse kinematic model will be clinically useful for predicting intervertebral rotation when X-ray or invasive measurements are undesirable. It will also be useful to biomechanical modelling, which requires accurate kinematic information as model input data.
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Sun, L.W., Lee, R.Y.W., Lu, W. et al. Modelling and simulation of the intervertebral movements of the lumbar spine using an inverse kinematic algorithm. Med. Biol. Eng. Comput. 42, 740–746 (2004). https://doi.org/10.1007/BF02345206
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DOI: https://doi.org/10.1007/BF02345206