Tognini, Martina;
Hothi, Harry;
Dal Gal, Elisabetta;
Henckel, Johann;
Shafafy, Masood;
Broomfield, Edel;
Tucker, Stewart;
... Hart, Alister; + view all
(2023)
Pin Fracture in Magnetically Controlled Growing Rods: Influence of the Year of Manufacture.
Journal of Pediatric Orthopaedics
10.1097/bpo.0000000000002460.
(In press).
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Abstract
Permissions ORIGINAL ARTICLE Pin Fracture in Magnetically Controlled Growing Rods: Influence of the Year of Manufacture Tognini, Martina BEng, MSc*; Hothi, Harry BEng, MSc, PhD†,‡; Dal Gal, Elisabetta MSc*; Henckel, Johann MBBS, MRCS, PhD‡; Shafafy, Masood MBBS, FRCS, FRCS§; Broomfield, Edel MSc∥; Tucker, Stewart MBBS, FRCS, FRCS∥; Skinner, John MBBS, FRCS, FRCS*,‡; Hart, Alister MA, MD, FRCS*,‡ Author Information Journal of Pediatric Orthopaedics ():10.1097/BPO.0000000000002460, June 19, 2023. | DOI: 10.1097/BPO.0000000000002460 OPEN PAP Metrics Abstract Background: Magnetically controlled growing rods (MCGRs) have a known issue with fracture of the internal locking pin resulting in early revisions. The manufacturer reported that rods manufactured before March 26, 2015, had a 5% risk of locking pin fracture. Locking pins made after this date are thicker in diameter and of a tougher alloy; their rate of pin fracture is not known. The aim of this study was to better understand the impact of the design changes on the performance of MCGRs. Methods: This study involves 46 patients with 76 removed MCGRs. Forty-six rods were manufactured before March 26, 2015, and 30 rods after that date. Clinical and implant data were collected for all MCGRs. Retrieval analysis comprised plain radiographs evaluations, force and elongation testing, and disassembly. Results: The 2 patient groups were statistically comparable. We found that 14 of 27 patients implanted with rods manufactured before March 26, 2015 (group I) had a fracture of their locking pins. Three of the 17 patients with rods manufactured after this date (group II) were also found to have a fractured pin. Conclusions: Retrieved rods collected at our center and made after March 26, 2015, had far fewer locking pin fractures than those made before this date; this may be due to the change in pin design.
| Type: | Article |
|---|---|
| Title: | Pin Fracture in Magnetically Controlled Growing Rods: Influence of the Year of Manufacture |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1097/bpo.0000000000002460 |
| Publisher version: | https://doi.org/10.1097/bpo.0000000000002460 |
| Language: | English |
| Additional information: | Copyright © 2023 The Author(s). Published by Wolters Kluwer Health,Inc. This is an open access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. |
| Keywords: | MCGR, retrieval analysis, pin fracture, EOS, scoliosis |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10172339 |
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