Lumbar Alligator Spinal System と cage を用いた後方進入腰椎椎体間固定術

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  • Posterior Lumbar Interbody Fusion using the Lumbar Alligator Spinal System and Threaded Cages

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Although posterior lumbar interbody fusion (PLIF) using threaded cages alone is a useful procedure, the rate of union for this operation is, in my experience, not so high. The Lumbar Alligator Spinal System (LA) has been developed to serve as a supporting instrumentation for this procedure. The LA is a kind of a clamping plate for the spinous processes. The aim of this paper is to clarify the results of PLIF using threaded cages and the LA. Between 2000 and 2001, single level posterior lumbar interbody fusion using LA and BAK Proximity Cages was performed in 24 patients with degenerative spondylolisthesis. One patient who suffered burst fracture of the fusion site at one month after surgery and another patient who had moved to an area very far from our hospital were excluded in this study. Therefore, we assessed 22 out of 24 patients. The study group consisted of 10 males and 12 females. The mean age at the operation was 64.9 years and the mean follow up period was 17 months. The intervertebral level of the operation was L4/5 in 20 patients, L3/4 in one and L5/6 in one. Diskectomy was done as much as possible, and the graft bone was placed not only in the cages but also in the spaces around the cages. Union was assessed radiologically. Solid union was defined as the point where bony bridging was detected between two vertebral bodies. Solid union of the operative intervertebral level was achieved in all cases. The LA is a useful instrument for PLIF using threaded cages.

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  • 脊髄外科

    脊髄外科 17 (2), 119-124, 2003

    日本脊髄外科学会

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