退行性脊柱侧凸后路矫形术35例远期随访

目的 回顾退行性脊柱侧凸后路矫形术后的远期临床效果,分析晚期并发症的发生原因,探讨合理的应对措施.方法 回顾1997年9月至2002年9月,采用后路椎问融合器结合经椎弓根螺钉治疗退行性脊柱侧凸35例.按照Oswestry功能障碍指数(ODI)评价临床效果,影像学检查评价术后融合节段以及邻近节段病变,测量侧凸冠状位Cobb角、腰前凸角,脊柱冠状面平衡,并分析融合范围、脊柱力线与远期并发症的关系.结果 术后ODI为17.8～62.2(平均34.7),患者对手术的主观满意率为71.4%.13例患者发生远期并发症,发生率为37.1%,10例出现临床症状,6例进行翻修手术,4例拒绝再次手术.远期并发症包括:近端交界区侧凸4例、近端交界区后凸4例、近端椎体压缩骨折1例、融合区假关节形成1例、远端椎管狭窄2例,螺钉松动1例.交界性后凸与脊柱力线异常无明显关系,融合至L1及以下邻近节段病变发生率(9/18)明显高于融合至T12以上(4/17).结论 退行性脊柱侧凸后路矫形远期并发症较高,术前应仔细评价脊柱力线情况,为减少远期近端交界性侧凸,近端可融合至T12以上.

Long-term follow-up after posterior corrective operation for degenerative scoliosis

OBJECTIVE: To evaluate the clinical outcome of posterior corrective operation for degenerative scoliosis and analyze the possible reasons for its late complications and their proper management. METHODS: Thirty-five patients with degenerative scoliosis, who were treated by posterior pedicle screw fixation and interbody fusion with cage implantation from September 1997 to September 2002, were reviewed. Their clinical outcomes were determined according to Oswestry Disability Index (ODI). The fusion area and its adjacent segments were evaluated through radiographic measurements of coronal Cobb angle, lumbar lordosis and coronal balance of the spine. The association of late complications, spinal alignment, and range of fusion was analyzed. RESULTS: At final follow-up, ODI was 17.8 - 62.2 (average 34.7). Late complications occurred in 13 patients, accounting for 37.1%. Among the 13 cases, 10 were symptomatic and 6 received revision surgery. The late complications were proximal junctional scoliosis in 4 patients, proximal junctional kyphosis in 4 patients, proximal compressed vertebral fracture in 1 patient, pseudarthrosis in 1 patient, pedicle screw loosening in 1 patient, and distal segment degeneration in 1 patient. Junctional kyphosis had no obvious relationship with abnormality of spinal alignment. Adjacent segment degeneration occurred more commonly in the cases with the proximal ultimate vertebra below L1 (9/ 18) than above T12 (4/17). CONCLUSIONS: The rate of late complications is relatively high after posterior corrective operation for degenerative scoliosis. Spinal alignment should be evaluated carefully in preoperative planning. The proximal ultimate vertebra should be extended to the level above T12 to avoid late complications.