The aim of percutaneous laser disk decompression(PLDD) is to vaporize a small portion of the nucleus pulpous of an intervertebral disk, thereby reducing the volume and pressure of a diseased disk. Pressure reduction creates a pressure gradient leading to migration of the herniated portion away from the involved nerve root.  This is based on a physical principal of Pascal Law. In an enclosed hydraulic space, small change in volume will result in a large change in pressure. 

The Advantages of the Laser Discectomy over conventional surgery include;

Performed as an out patient procedure

Do not preclude alternative surgical options

Reduced risk of complications

Usually provide immediate relief of symptoms

Reduced soft tissue injury

No bone is sacrificed

No epidural fibrosis