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Abstract

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For surgical stabilization of thoracolumbar instability either posterior transpedicular
fixation or anterior interbody fixation is commonly performed. On some occasions,
however, combined ventral and dorsan stabilization is needed, in which case surgery is
usually performed in separate stages. To achieve this goal in a single operation, the
authors used the crossed-screw fixation technique, with the pedicle screw-rod system.
in eight patients. Their thoracolumbar instabilities were caused by trauma(n=16),
tumor(n=1), and congenital deformity(n=1). In all patients, signs of myelo- and/or
radiculopathy were present, and as this required extensive ventral and dorsal
decompression, combined ventral and dorsal stabilizations was considered necessary.
Surgery involved the lateral extracavitary approach ; for dorsal stabilization, the
conventional transpedicular fixation method, with pedicle screws of 5.5-mm diameter,
was used. For ventral stabilization, interbody struts were grafted using rib autograft or
in the cases of tumor fibula allograft, supplemented with transverse fixation of the
vertebral body with pedicle screws of 7.5-mm diameter. The two stabilization system.
ventral and dorsal, were interconnected with cross-linking plates. Follow-up 12 to
26(average 18) months after surgery revealed no hardware failures, and all patients
showed improvement in their neurological functions during this period. Due to congenital
deformity, graft dislodgement occurred in one patient. On the basis of these results the
authors believe that the crossed-screw fixation technique is a viable option for
three-dimensional stabilization to the thoracolumbar spine.

Thoracolumbar instability; Crossed-screw fixation; Transpedicular fixation; Interbody fixation; Three-dimensional stabilization;

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