The treatment of degenerative lumbar spinal stenosis, either conservatively or surgically, stili remains controversjal. The discııssedpart of surgical intervention is arthrodesis and instrumentation,

In this study, 30 patients operated because of lumbar degenerative spinal stenosis, with total bilateral laminectomy, posterolateral fusion and posterior instrumentation are evaluated. The mean age is 56 and the follow-up period is 38.34 months in average. AH cases were evaluated with neurologic examination, plain roentgenograms and Computed Tomography.

Spinal cana! stenosis was found in one level in 10, in two levels in 7, in three levels in 8 and multilevel in 5 cases. Surgical procedure was performed in one level in 10, in two levels in 8, in three levels in 8 and in four levels in 4 patients.

26 patients were very glad especially because of their walking distance and dimı'nished low back pain. İn 2 cases, deep infection developed and their Instruments were taken out. 2 patients had the need to use external support at the last controi.

Therefore, it is concluded that radical laminectomy, posterolateral fusion and posterior instrumentation is a good choice of procedure for multilevel degenerative spinal stenosis.

Keywords: Spinal stenosis, instrumentation, posterolateral fusion