25-3-2011, lateral recess stenosis L4-5

48year-old- man, 2 years intermitten claudication; 2 months with L. leg pain & numbness L5, LSRT 90, EHL 2/4. MRI show lateral recess stenosis on the left L4-5, I only did fernestration on the left side although we can see bilateral lumbar stenosis with bugl disk at the center.