The sample size calculation is based on distribution of the main variable, self-rated limb pain measured by Visual Analogue scaling (VAS). Based on the assumption of normality, a significance level of 5 % (α = 0.05), a power of (β = 0.80) and a clinical relevant difference of one time Standard Deviation (SD), 21 patients should be included in each of the two treatment groups. There will also be a sex- and age-matched comparison group of healthy persons (n:21).