50 patients, based on the following calculation of study size: The standard deviation for Neck Disability index, NDI, is just under 7, while "minimally clinical important difference" (MCID) is 7 points . That gives that 16 patients are needed in each group to get 80% power with a significance level of 5%. However, in the studied population the one year mortality rate is substantial, especially after a neck injury . In order to be able to draw conclusions from the study the investigators have elected to expand the study to 25 subjects in each group.