The spine journal : official journal of the North American Spine Society
-
Traumatic cervical facet dislocation accounts for a disproportionate rate of neurologic disability. The relative importance of patient and management variables, including the timing of spinal reduction, in ultimate neurologic outcome has not been well defined. ⋯ The present study uses a statistical model to determine the relative importance of clinically relevant variables for a population of patients after traumatic cervical facet dislocation. This model confirms the clinical impression that younger patients with lesser degrees of neurologic injury tend to achieve the best neurologic recovery after a traumatic facet dislocation. Although a strong benefit from earlier spinal column reduction did not emerge from the present data set, additional study is needed to define those patients who would benefit from immediate reduction of the spinal column.
-
Researchers studying early pedicle screw designs have suggested that pullout strength and insertional torque are correlated. For surgeons using pedicle screws, insertional torque is widely believed to be a good predictor of pullout strength and initial stability of the screw and construct. How appropriate is this assumption when applied to new screw and thread designs? ⋯ This unexpected result is best explained by the progressively narrowing flutes of the Xia screw, which compact the trabeculae into a smaller volume as the screw nears full insertion. The trapezoidal threads also increase contact with the cortical surface area and compress trabeculae toward the cortex, thus creating greater friction and higher torque values. This increase in torque did not translate into a commensurate increase in pullout strength, where trabeculae fail in shear.
-
Review Case Reports
Acute spinal cord compression caused by vertebral hemangioma.
The reported incidence of vertebral hemangioma within the spinal column is common. Most often these benign vascular tumors are incidental radiographic findings and do not cause neurological sequelae. Rarely, vertebral hemangiomas will cause compressive neurological symptoms, such as radiculopathy, myelopathy and paralysis. In these cases the clinical presentation is usually the subacute or delayed onset of progressive neurological symptoms. This report demonstrates a symptomatic vertebral hemangioma presenting with rapid onset neurologic sequelae. ⋯ Because of the rapid presentation of myelopathic symptoms in this case, preoperative angiographic embolization was not performed, and the patient underwent emergent decompressive surgery. In this case emergent operative decompression and stabilization was effective in reversing the patient's myelopathic symptoms, while maintaining long-term stability of the spinal column. Postoperative radiation was not administered because of the extent of tumor resection. Surgical intervention has produced long-term cure of this patient's myelopathy and T10 vertebral hemangioma.
-
Randomized Controlled Trial Clinical Trial
Posterior lumbar interbody fusion using recombinant human bone morphogenetic protein type 2 with cylindrical interbody cages.
In a large series of human patients undergoing open anterior lumbar interbody fusion with a tapered titanium fusion cage, recombinant human bone morphogenetic protein type 2 (rhBMP-2) on an absorbable collagen sponge carrier has been shown to decrease operative time and blood loss, to promote osteoinduction and fusion and to be a safe and effective substitute for iliac crest harvesting. ⋯ This small multicenter, randomized, nonblinded trial showed few statistically significant differences between the study groups. Both groups showed comparable improvements on outcome scores. Overall results show that the use of rhBMP-2 can eliminate the need for harvesting iliac crest graft and may be an equivalent replacement for autograft for use in successful posterior lumbar interbody fusions. Further studies of the use of rhBMP-2 in posterior lumbar interbody fusion cage procedures are needed.
-
Randomized Controlled Trial Clinical Trial
The effect of spinal steroid injections for degenerative disc disease.
No conclusive evidence exists to determine that spinal steroid injections give lasting improvement in patients with predominantly axial low back pain resulting from lumbar degenerative disc disease (DDD). ⋯ Spinal steroid injections, both ESI and ISI, are beneficial for a small number of patients with advanced DDD and chronic low back pain. For those patients in whom a beneficial effect is found, spinal steroid injection is a low-risk and rapid treatment option. Spinal steroid injections are more effective in patients with MRI findings of discogenic inflammation, specifically adjacent inflammatory end-plate changes.