What is Minimally invasive surgery and laser surgery of the back?

Minimally invasive surgery involves operations in which the surgery is performed using small incisions,Special retractors and the use of Magnification.By this advanced techniques the results are many times better than compared to a classic open surgery. Laser surgery is not a form of surgery, it is only a form of technique.Laser surgery for the back has very limited applications and the results are not yet promising.