Clinical efficacy and biomechanical analysis of a novel hollow pedicle screw combined with kyphoplasty for the treatment of Kümmell disease.

3.5 The maximum von Mises stress on T11 and L1 As depicted in Figure 5A,B , in the flexion, left and right bending of the six models, the von Mises stress of the adjacent T11 and L1 presented an increasing trend.

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Unfortunately, the vertebral height and local kyphosis at last follow‐up showed a trend of deterioration compared with those at initial postoperative.

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