Journal of spinal disorders & techniques
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J Spinal Disord Tech · Oct 2011
Digital 3-dimensional analysis of the paravertebral lumbar muscles after circumferential single-level fusion.
A retrospective controlled cohort study was performed for postoperative 3-dimensional muscle evaluation. ⋯ We established a 3-dimensional image analysis method for evaluating postoperative changes in the lumbar paravertebral muscles of patients, after circumferential single-level fusion, consistently accounting for implant-associated artifacts. We were able to demonstrate volume atrophy and an increase of fatty degeneration after 12 months compared with 1 week postoperatively.
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J Spinal Disord Tech · Oct 2011
Changes of upper thoracic curve and shoulder balance in thoracic adolescent idiopathic scoliosis treated by anterior selective thoracic fusion using VATS.
A retrospective radiographic analysis. ⋯ Among patients who have DT curve, patients with mild left shoulder elevation (<20 mm) can be treated by anterior correction unless the magnitude of upper thoracic curve or superior portion of lower thoracic curve are ≥30 degrees. For anterior correction, criteria of DT curve might be applied less strictly.
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J Spinal Disord Tech · Oct 2011
The facet joint loading profile of a cervical intervertebral disc replacement incorporating a novel saddle-shaped articulation.
Biomechanical study. ⋯ Biomechanical testing in an ovine model demonstrated no significant difference in measured facet pressures and forces between an intact native cervical disc specimen and a cervical intervertebral disc prosthesis using a saddle-shaped articulation. Peak and mean pressures were not demonstrated to be significantly different between the implanted and intact disc conditions. Implantation of the prosthesis resulted in a significant reduction of contact area under extension moments.
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Retrospective, consecutive patient series. ⋯ Our clinical findings indicate that lateral mass fixation can be used safely with minimal complications and low rate of morbidity for cervical myelopathy treatment.