Fig. 4From: Posterior longitudinal ligament resection during microscopic anterior cervical discectomy: technique and safety considerationa (upper) Bar chart showing a significant difference between median VAS score in preoperative and early and late postoperative periods by Friedman’s test (p < 0.001). b (Lower) Bar chart showing a significant difference between median motor grade in preoperative and postoperative periods by Wilcoxon signed rank test (p < 0.001)Back to article page