Figure 3From: Surgical fasciectomy of the trapezius muscle combined with neurolysis of the Spinal accessory nerve; results and long-term follow-up in 30 consecutive cases of refractory chronic whiplash syndrome Impairment caused by headache (VAS) at one-year follow-up relative to pre-surgical symptoms. 1 = No change; 2 = < 30% reduction; 3 = 30-49% reduction; 4 = 50-99% reduction; 5 = complete resolution. n = 27.Back to article page