Fig. 7

Case 2: a 62-year-old woman was admitted to the hospital because of “low back pain with pain in the medial aspect of the left lower leg for 2 months”. Lumbar MRI showed that the L3/4 disc had migrated to zone 1 in the posterior right upper side of the body, which was accompanied by L4/5 disc herniation (Fig. 7a, b). According to the patient’s signs and imaging examination, we determined that the patient’s symptoms were caused by L4 nerve root compression. Therefore, the patient underwent posterior PELD to remove the L3/4 upward migrated herniated disc. MRI was immediately repeated, which showed that the protruding tissue in the spinal canal was completely removed and that the spinal canal was re-expanded (Fig. 7c, d). Postoperative CT showed the bone tunnel (Fig. 7e, f)