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This technique is indicated in lumbar canal stenosis. In this procedure, the space for cauda equina and nerve roots is increased, by removing the compressing elements. Patients requiring this procedure are elderly and require preoperative evaluation for fitness.

The surgery is performed in prone position under anesthesia. A midline vertical incision is taken. The paraspinal muscles are reflected. The laminae and ligamentum flavum is removed with aid of microscope. An undercutting facetectomy is performed. The nerve roots are freed and the incison is closed. Patient is mobilized out of bed next day.

This surgery gives excellent relief of claudication and patient’s waking distance improves.