A Novel Motion-Preservation Technique for Intra and Intra-Intersegmental Repair of Spondylolysis and Spondylolisthesis: The Lin Technique.

医学 脊椎滑脱 脊椎峡部裂 固定(群体遗传学) 骨移植 外科 关节间部 退行性椎间盘病 骨性结合 腰椎 内固定 环境卫生 人口
作者
James T. Bennett,Kenneth J Zook,Peter M Eyvazzadeh,Paul Lin
出处
期刊:PubMed 卷期号:29: 367-373
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A novel motion-preserving technique to directly repair pars defects. Moreover, the indications for repair are expanded to include those with disc disease and associated spondylolisthesis.The challenge in treating pars defects has been that there are few techniques available to stabilize them adequately. Treatment has focused on fusion across the inter-space versus grafting and instrumentation of the defect itself. We hypothesize that direct repair of the defect favors maintenance of normal motion characteristics by preserving the functional unit of the disc. This paper describes a motion-preserving technique to repair bilateral pars defects and its early clinical outcomes.A retrospective review of 20 patients with symptomatic bilateral pars defects treated with either intra-segmental or intra-intersegmental motion-preserving repair with two years of follow-up. Fifteen patients met the criteria for single level fixation. Five patients required additional fixation of flexible posterolateral fusion involving the inferior segment. Rh-BMP and autologous bone graft were placed within the defect. Plain film X-rays were used to determine stability, and thin-section CT was used to assess healing of the defect.The procedure arrested any further slippage in 100% of cases, with bony healing in 95% of cases as demonstrated by CT scan. Clinical outcomes for the entire series were: excellent n=14, good n=3, no significant help n=3. For all cases there was a 5% rate of non-union.Further study and development of the technique via biomechanical testing is ongoing; however, the initial results are encouraging. Bone formation appears to be linked to decreasing symptoms in patients with bilateral pars fractures who have failed conservative treatment.

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