DOS 2018

250 · DOS Abstracts 3-year follow-up of single magnetically controlled growing rod (MCGR) with contralateral gliding system and apical control for early onset scoliosis Simon Toftgaard Skov, Sebastiaan P.J. Wijdicks, Haisheng Li, Kruyt Moyo, René Castelein, Cody Bünger Dep. of Orthopaedic Surgery, Aarhus University Hospital; Dep. of Orthopaedic Surgery, University Medical Center Utrecht, The Netherlands Background: The MCGR method for growth sparing treatment of severe early onset scoliosis has gained popularity lately worldwide, because of the non-inva- sive lengthenings. Disadvantages are: high initial costs and lack of apical control. To overcome these, we combined a single concave MCGR with a contralateral sliding rod system with apical control. Purpose / Aim of Study: To investigate the feasibility, 3D correction, spinal growth and complications of this new MCGR-hybrid principle after minimum 2 years of interval lengthenings. Materials and Methods: A consecutive series of patients treated with this new principle at two European spine centers were evaluated retrospectively, includ- ing all patients operated between Sept. 2014 and June 2016. Demographics and clinical parameters were recorded from patient files. Length, Cobb angles and rotation (Nash-Moe method), were measured on standard digital radio- graphs. Findings / Results: 18 patients with a median age at treatment of 9 years with a mean follow- up time of 3 years (range 2-3.7). The frontal Cobb angle was reduced from mean 59 pre-op to 30 post-op and slightly increased to 36 at latest follow- up. Rotation of the apical vertebra improved from mean 27 to 18 post-op but was partially lost to 24 during follow- up. Kyphosis increased 5 de- grees during follow-up. Instrumented spine growth was mean 12 mm/year the first year and averaged 10 mm/year at last follow-up. There were 8 total com- plications, with 7 device related complications. 3 patients required unplanned revision; two because of failure of MCGR distraction and one because of rod breakage. There were no infections. Conclusions: 3D correction was satisfactory and spinal growth maintained with few complications. This new apical control single growth engine approach seems cost-effective in providing 3D correction and to maintain spinal growth in EOS. 191.