4.1 Article

Rod Fracture in Magnetically Controlled Growing Spine Rods

期刊

JOURNAL OF PEDIATRIC ORTHOPAEDICS
卷 43, 期 4, 页码 211-217

出版社

LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/BPO.0000000000002361

关键词

MCGR; MAGEC rods; early-onset scoliosis; fracture; growing rods

向作者/读者索取更多资源

Retrospective analysis of explanted magnetically controlled growing rods (MCGRs) aimed to understand their fracture mechanisms and related risk factors. Findings showed that all fractured rods were single-rod constructs and greater rod contouring angles and distances between anchoring points were significant factors contributing to the fractures. Therefore, implanting double rod constructs in patients with mature spines is preferable to avoid this complication.
Background:The mechanisms of fracture in magnetically controlled growing rods (MCGRs) and the risk factors associated with this are poorly understood. This retrospective analysis of explanted MCGRs aimed to add understanding to this subject. Methods:From our cohort of over 120 retrieved MCGRs, we identified 7 rods that had fractured; all were single-rod constructs, retrieved from 6 patients. These were examined and compared with 15 intact single-rod constructs. Retrieval and fractographic analyses were used to determine the failure mode at the fracture site and the implant's functionality. Cobb angle, degree of rod contouring, and the distance between anchoring points were computed on anteroposterior and lateral radiographs. Results:5/7 versus 3/15 rods had been inserted after the removal of a previously inserted rod, in the fractured versus control groups. All fractured rods failed due to bending fatigue. Fractured rods had greater rod contouring angles in the frontal plane (P = 0.0407) and lateral plane (P = 0.0306), and greater distances between anchoring points in both anteroposterior and lateral planes (P = 0.0061 and P = 0.0074, respectively). Conclusions:We found all failed due to a fatigue fracture and were virtually all single rod configurations. Fracture initiation points corresponded with mechanical indentation marks induced by the intraoperative rod contouring tool. Fractured rods had undergone greater rod contouring and had greater distances between anchoring points, suggesting that it is preferable to implant double rod constructs in patients with sufficient spinal maturity to avoid this complication.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.1
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据