• Heli Keskinen, Ilkka Helenius, Colin Nnadi, Kenneth Cheung, J Ferguson, Gregory Mundis, Jeff Pawelek, and Behrooz A Akbarnia.
• Department of Paediatric Orthopaedic Surgery, University of Turku and Turku University Hospital, Kiinamyllynkatu 4-8, 20521, Turku, Finland.
• Eur Spine J. 2016 Oct 1; 25 (10): 3294-3300.

PurposeNon-invasive distraction of magnetically controlled growing rods (MCGR) avoids repeated surgical lengthening in patients with early onset scoliosis, but it is not known how effective this technique is in previously operated children.MethodsIn a retrospective, multicentre study, the data were obtained for 27 primary (P) patients [mean age 7.0 (2.4-10.7) years at surgery] and 23 conversion (C) patients [mean age 7.7 (3.6-11.0) years at conversion from standard growing rods] with 1-year follow-up.ResultsThe mean major curve was 63.9° in the P group and 46.5° in the C group at baseline (preoperatively, p = 0.0009) and 39.5° and 39.6°, respectively, at 1-year follow-up (p = 0.99). The mean percentage change of spinal growth from baseline to 1-year follow-up was 18.3 % in the P group and 6.5 % in the C group (p = 0.007). Comparing the spinal growth from postoperative to 1-year follow-up no statistical difference was observed between the study groups (1.8 % P vs -2.2 % C, p = 0.09).ConclusionsScoliosis can be equally controlled after conversion from traditional growing rods into MCGR, but spinal growth from baseline is less in the conversion patients as compared with the primary group.Level Of EvidenceIII.

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