Journal of spinal disorders & techniques
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J Spinal Disord Tech · Jun 2009
Randomized Controlled TrialCoronal and sagittal plane correction in patients with Lenke 1 adolescent idiopathic scoliosis: a comparison of consecutive versus interval pedicle screw placement.
Prospective clinical study. ⋯ Interval pedicle screw placement constructs seem to be equally effective as consecutive constructs for facilitating curve correction in patients with Lenke 1 AIS.
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J Spinal Disord Tech · Jun 2009
Clinical TrialAnatomic determination of optimal entry point and direction for C1 lateral mass screw placement.
Anatomic study of C1 osteology using computerized tomography. ⋯ C1 lateral mass screws are best placed beneath the posterior arch, parallel with the arch in the sagittal plan. The entry point is the medial border of the neural arch at its junction with the lateral mass. Straight ahead screw direction is safe in the axial plane, but up to 20 degrees of medial angulation will increase the safety margin from the vertebral artery foramen, and this technique avoids vertebral artery damage and optimizes lateral mass screw purchase. We suggest that this is the preferred method of entry into the lateral mass of C1.
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J Spinal Disord Tech · Jun 2009
Preventing distal pullout of posterior spine instrumentation in thoracic hyperkyphosis: a biomechanical analysis.
An in vitro biomechanical study. ⋯ Posterior dual rod constructs fixed distally using pedicle screws were stiffer and stronger in resisting forward flexion compared with cables or hooks alone. Augmenting these screws with either infralaminar hooks or sublaminar cables provided additional resistance to failure.
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J Spinal Disord Tech · Jun 2009
Clinical TrialFuzzy-logic-assisted surgical planning in adolescent idiopathic scoliosis.
Selection of appropriate curve fusion levels for surgery in adolescent idiopathic scoliosis (AIS) is a complex and difficult task and, despite numerous publications, still remains a highly controversial topic. ⋯ Given the same information, the fuzzy-logic-assisted recommendation of the curve to be instrumented compared favorably with the collective decision of the surgeons. The findings thus suggest that a fuzzy-logic approach is helpful in assisting surgeons with the preoperative selection of curve instrumentation and fusion levels in AIS.
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J Spinal Disord Tech · Jun 2009
Case ReportsRetrieval analysis of a ProDisc-L total disc replacement.
We retrieved a functioning ProDisc-L total disc replacement and associated tissues at 16 months of service life. ⋯ A larger series of implant retrievals will be needed to investigate possible wear and the biologic response to increased particle generation.