Multicentre prospective research carried out in a group of 872 patients, published in 2004 (10) define the number of complications to 23%, from which 14% of patients required reoperation. The division of these complications was as follow: 9,7% general, 8,6% neurological, 5,6% infections, 3,6% cerebral leptomeninx damage. The indicator of complications was strictly correlated with weight or also overweight of the patient and spondydelosis size. The number of complications in the spine surgery, presented on the base of scientific literature, displays its wide range, although the number of serious complications systematically decreases. The number of serious complications is directly proportional with the complexity of the operative procedure, but also depends on the general state of the patient (obesity).