Saifuddin A, White J, Tucker S, Taylor B A
Royal National Orthopaedic Hospital Trust, Stanmore, England, UK.
J Bone Joint Surg Br. 1998 Mar;80(2):208-11. doi: 10.1302/0301-620x.80b2.8219.
Lateral oblique radiographs are considered important for the identification of spondylolytic lesions, but these projections will give a clear view only when the radiological beam is in the plane of the defect. We studied the variation in orientation of spondylolytic lesions on CT scans of 34 patients with 69 defects. There was a wide variation of angle: only 32% of defects were orientated within 15 degrees of the 45 degrees lateral oblique plane. Lateral oblique radiographs should not be considered as the definitive investigation for spondylolysis. We suggest that CT scans with reverse gantry angle are now more appropriate than oblique radiography for the assessment of spondylolysis. Variation in the angle of the defect may also need consideration when direct repair is being planned.
侧斜位X线片被认为对椎弓峡部裂性病变的识别很重要，但只有当放射线束位于缺损平面时，这些投照才会给出清晰的图像。我们研究了34例有69处缺损的患者的CT扫描中椎弓峡部裂性病变的方向变化。角度变化很大：只有32%的缺损位于45度侧斜平面15度范围内。侧斜位X线片不应被视为椎弓峡部裂的确定性检查。我们建议，对于椎弓峡部裂的评估，现在使用反向机架角度的CT扫描比斜位X线摄影更合适。在计划直接修复时，也可能需要考虑缺损角度的变化。
