Heli Keskinen1, Ilkka Helenius2, Colin Nnadi3, Kenneth Cheung4, J Ferguson5, Gregory Mundis6, Jeff Pawelek6, Behrooz A Akbarnia6. 1. Department of Paediatric Orthopaedic Surgery, University of Turku and Turku University Hospital, Kiinamyllynkatu 4-8, 20521, Turku, Finland. 2. Department of Paediatric Orthopaedic Surgery, University of Turku and Turku University Hospital, Kiinamyllynkatu 4-8, 20521, Turku, Finland. ilkka.helenius@utu.fi. 3. Spine Unit, Oxford University Hospital, Oxford, UK. 4. Department of Orthopaedic Surgery, The University of Hong Kong, Pokfulam, Hong Kong. 5. Starship Children's Hospital, 2 Park Rod, Grafton, Auckland, New Zealand. 6. San Diego Center for Spinal Disorders, La Jolla, CA, USA.
Abstract
PURPOSE: Non-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. METHODS: In 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. RESULTS: The 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). CONCLUSIONS: Scoliosis 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 EVIDENCE: III.
PURPOSE: Non-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. METHODS: In 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. RESULTS: The 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). CONCLUSIONS:Scoliosis 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 EVIDENCE: III.
Entities:
Keywords:
Deformity correction; Early onset scoliosis; Magnetic growing rods; Revision surgery; Spinal growth
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