Montgomery D M, Fischgrund J S
Department of Orthopaedic Surgery, William Beaumont Hospital, Royal Oak, Michigan.
J Spinal Disord. 1994 Apr;7(2):167-72. doi: 10.1097/00002517-199407020-00011.
Translational motion of low-grade spondylolisthesis is traditionally assessed with lateral flexion and extension radiographs. Maximum motion in an unanesthetized patient may be limited by patient cooperation, pain, or muscle spasm. Twenty-four patients with degenerative or isthmic spondylolisthesis were assessed with preoperative lateral flexion and extension radiographs. A lateral radiograph was obtained on the operating room table after administering an anesthetic, exposing the spine, and performing a laminectomy. The percentage slip decreased from 24 to 15 to 6% on flexion, extension, and intraoperative lateral radiographs, respectively (p < 0.001). The amount of reduction did not correlate with disc height, slip angle, slip level, or type of spondylolisthesis. Many low-grade spondylolisthesis deformities reduce almost completely on the operating table. Translational motion of spondylolisthesis is greater than preoperative flexion and extension radiographs indicate.
传统上，低度腰椎滑脱的平移运动是通过侧屈和伸展位X线片进行评估的。在未麻醉的患者中，最大运动可能会受到患者配合度、疼痛或肌肉痉挛的限制。对24例退行性或峡部裂性腰椎滑脱患者进行了术前侧屈和伸展位X线片评估。在手术室手术台上，在给予麻醉、暴露脊柱并进行椎板切除术后，获得一张侧位X线片。在屈曲、伸展和术中侧位X线片上，滑脱百分比分别从24%降至15%再降至6%（p<0.001）。复位量与椎间盘高度、滑脱角度、滑脱节段或腰椎滑脱类型无关。许多低度腰椎滑脱畸形在手术台上几乎完全复位。腰椎滑脱的平移运动大于术前侧屈和伸展位X线片所示。
