The spinal nail: a new implant for short-segment anterior instrumentation of the thoracolumbar spine.

Dawson JM, DeBoer DK, Spengler DM, Schwartz HS
J Spinal Disord. 1996 9 (4): 299-305

PMID: 8877956

The biomechanics of a new spinal implant were evaluated and its dependence on an anterior strut graft was determined. Six fresh-frozen adult porcine spines were used. An L3 corpectomy was created. The spinal nail was inserted intraosseously into the middle column of the L2-L4 vertebral bodies in a trough. Implant drill holes were made for proximal and distal locking bolts in L2 and L4. A locking plate bridged the L2 and L4 trough and anchored the exposed ends of the locking bolts. Testing was performed in axial compression, torsion, and flexion. The axial and torsional stability of the spine instrumented with the spinal nail are similar to results with other devices when used with anterior strut grafting. The axial and flexural stiffnesses of the instrumented spine are independent of strut grafting. This study suggests that this device may be useful for reconstruction of the anterior spine because of instability.

MeSH Terms (9)

Animals Biomechanical Phenomena Bone Nails Bone Plates Evaluation Studies as Topic Lumbar Vertebrae Spinal Cord Compression Swine Thoracic Vertebrae

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