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Assessment of material loss of retrieved magnetically controlled implants for limb lengthening

Foong, B; Panagiotopoulou, V-C; Hothi, HS; Henckel, J; Calder, PR; Goodier, DW; Hart, AJ; (2018) Assessment of material loss of retrieved magnetically controlled implants for limb lengthening. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine , 232 (11) pp. 1129-1136. 10.1177/0954411918806329. Green open access

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Abstract

PURPOSE: We aimed to understand wear from the telescopic component of PRECICE nails, which are used for distraction osteogenesis of the femur or tibia. We also aimed to identify any correlation between implant performance and patient factors. METHODS: This retrieval study involved 11 magnetically controlled intramedullary nails from nine patients who had achieved the targeted leg length. All the nails were assessed macroscopically and microscopically for wear. All implants were radiographed to assess the internal mechanism. A Talyrond 365 (Taylor Hobson, Leicester, UK) roundness measuring machine was used to generate three-dimensional surface maps of the telescopic components to allow for measurement of wear. RESULTS: Visual assessment of all the nails showed evidence of wear from the telescopic component. The radiographs revealed that all the nails had intact internal mechanism and no evidence of fractured pins. The roundness measuring machine showed that the quantity of wear was lowest in the latest design of the PRECICE nail. There was no significant correlation between wear and the two patient factors (duration of the lengthening phase, the time of implantation) included in this study. CONCLUSION: This study is the first to investigate the performance of the three different designs of the PRECICE system with a focus on wear. We found that the latest design had the best implant performance. We are confident of the continued success of the PRECICE system and reassure surgeons and patients that they are unlikely to encounter problems with the implant related to wear.

Type: Article
Title: Assessment of material loss of retrieved magnetically controlled implants for limb lengthening
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1177/0954411918806329
Publisher version: https://doi.org/10.1177%2F0954411918806329
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Limb length discrepancy, intramedullary nails, distraction osteogenesis, magnetically controlled intramedullary nails, material loss
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Ortho and MSK Science
URI: https://discovery.ucl.ac.uk/id/eprint/10060519
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