Magnetically Controlled Growing Rods: The Experience of Mechanical Failure from a Single Center Consecutive Series of 28 Children with a Minimum Follow-up of 2 Years

Asian Spine Journal
Alastair BeavenJonathan B Spilsbury

Abstract

Retrospective observational study of a continuous series of 28 children. To determine the mechanical failure rate in our cohort of children treated with magnetically controlled growth rods (MCGRs). Previous studies report a MCGR mechanical failure rate of 0%-75%. All patients with MCGR implantation between 2012 and 2015 were examined and followed up for a minimum of 2 years. A retrospective evaluation of contemporaneously documented clinical findings was conducted, and radiographs were retrospectively examined for mechanical failure. The external remote controller (ERC)-specified length achieved in the clinic was compared to the length measured on subsequent radiographs. Fourteen mechanical failures were identified in 28 children (50%) across a total of 52 rods (24 pairs and four single constructs). Mechanical failures were due to: failure to lengthen under general anesthesia (seven children), actuator pin fracture (four), rod fracture (one), foundation screw failure (one), and ran out of rod length (one). Of the 14 mechanical failures, six were treated with final fusion operations (reflecting limited further growth potential), and eight patients were treated with the intention for further lengthening. We therefore consider the...Continue Reading

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Citations

Apr 8, 2020·Medical Devices : Evidence and Research·Athanasios I Tsirikos, Simon B Roberts
Jul 28, 2020·European Journal of Orthopaedic Surgery & Traumatology : Orthopédie Traumatologie·Saba Pasha, Peter F Sturm

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