Useful of radical neck dissection would not be questioned if the effects would be perfect. When postoperative morbidity is associated with oncological shortage of radical neck dissection in functional and cosmetics disfunction, looking for a new therapeutics procedures are justify. In our study were 319 patients. They were treated in period from 01 January 2000 to 31 December 2002. The follow-up was 5 year. We tried to consolidate distribition of n. accesorius operative injuries in modified radical neck dissection and relationship beetwen shoulder pain and shoulder droop after modified and radical neck dissection. Injured n.accesorius in modified radical neck dissection was significantly decreased in patients with modified radical neck dissection. The frequence of patients is significantly different (chi m2=26.662; df = 1; p<0.01) in categories of complications of n.accesorius (shoulder pain, shoulder droop). Shoulder pain and shoulder droop were significantly decreased in modified radical neck dissection (p<0.01).