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Research article
Mechanical Wear Analysis Helps Understand a Mechanism of Failure in Retrieved Magnetically Controlled Growing Rods: A Retrieval Study
Jack Z. Wei
University College London
Corresponding Author
ORCiD: https://orcid.org/0000-0002-1983-0958
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published version at BMC Musculoskeletal Disorders.
Purpose: To assess the relationship between mechanical wear and the failure of the internal lengthening mechanism in retrieved MAGnetic Expansion Control (MAGEC) growing rods.
Methods: This study included 34 MAGEC rods retrieved from 20 patients. The state of the internal mechanism and mechanical wear were assessed in all the rods using plain radiographs and visual inspection. Metrology was then performed to assess the topography and mechanical wear of the telescopic bars, using a Talyrond 365 (Taylor Hobson, Leicester, UK) roundness measuring machine.
Results: Plain radiographs showed evidence of a broken internal mechanism in 29% of retrieved rods. Single-side wear marks were found in 97% of retrieved rods. Material loss was found to significantly increase in rods with a damaged internal mechanism (p<0.05) and rods with longer time in situ (r=0.692, p<0.05).
Conclusion: We found an association between damage to the internal mechanism of the rods and (1) patterns of single-side longitudinal wear marks and (2) increased material loss. As the material loss was also found to increase over time of rod in situ, we emphasise the importance of early detection and revision of failed MAGEC rods in clinical practice.
Keywords
Early-onset scoliosis, Magnetic expansion control growing rods, Internal mechanism, Mechanical wear, Material loss
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CURRENT STATUS: Published
Published
On 05 Aug, 2020
No community comments so far
Editorial decision: Accept
On 24 Jul, 2020
Editor assigned
On 22 Jul, 2020
Submission checks complete
On 21 Jul, 2020
Editor invited
On 21 Jul, 2020
No comments provided
Editorial decision: Minor revision
On 13 Jul, 2020
Editor assigned
On 08 Jul, 2020
Submission checks complete
On 07 Jul, 2020
Editor invited
On 07 Jul, 2020
No comments provided
Editorial decision: Minor revision
On 23 Jun, 2020
Editor assigned
On 22 Jun, 2020
Submission checks complete
On 21 Jun, 2020
Editor invited
On 21 Jun, 2020
Version 1
Posted 05 May, 2020
No comments provided
Review #2 received
Received 02 Jun, 2020
Editorial decision: Minor revision
On 02 Jun, 2020
Review #1 received
Received 24 May, 2020
Reviewer #2 agreed
On 11 May, 2020
Reviewers invited
Invitations sent on 04 May, 2020
Reviewer #1 agreed
On 04 May, 2020
Editor assigned
On 22 Apr, 2020
Submission checks complete
On 21 Apr, 2020
Editor invited
On 21 Apr, 2020
First submitted
On 20 Apr, 2020
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Subject Areas
Orthopedics
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This preprint is under consideration at BMC Musculoskeletal Disorders. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research article
Mechanical Wear Analysis Helps Understand a Mechanism of Failure in Retrieved Magnetically Controlled Growing Rods: A Retrieval Study
Jack Z. Wei
University College London
Corresponding Author
ORCiD: https://orcid.org/0000-0002-1983-0958
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
Published
On 05 Aug, 2020
No community comments so far
Editorial decision: Accept
On 24 Jul, 2020
Editor assigned
On 22 Jul, 2020
Submission checks complete
On 21 Jul, 2020
Editor invited
On 21 Jul, 2020
No comments provided
Editorial decision: Minor revision
On 13 Jul, 2020
Editor assigned
On 08 Jul, 2020
Submission checks complete
On 07 Jul, 2020
Editor invited
On 07 Jul, 2020
No comments provided
Editorial decision: Minor revision
On 23 Jun, 2020
Editor assigned
On 22 Jun, 2020
Submission checks complete
On 21 Jun, 2020
Editor invited
On 21 Jun, 2020
Version 1
Posted 05 May, 2020
No comments provided
Review #2 received
Received 02 Jun, 2020
Editorial decision: Minor revision
On 02 Jun, 2020
Review #1 received
Received 24 May, 2020
Reviewer #2 agreed
On 11 May, 2020
Reviewers invited
Invitations sent on 04 May, 2020
Reviewer #1 agreed
On 04 May, 2020
Editor assigned
On 22 Apr, 2020
Submission checks complete
On 21 Apr, 2020
Editor invited
On 21 Apr, 2020
First submitted
On 20 Apr, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Orthopedics
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published version at BMC Musculoskeletal Disorders.
Purpose: To assess the relationship between mechanical wear and the failure of the internal lengthening mechanism in retrieved MAGnetic Expansion Control (MAGEC) growing rods.
Methods: This study included 34 MAGEC rods retrieved from 20 patients. The state of the internal mechanism and mechanical wear were assessed in all the rods using plain radiographs and visual inspection. Metrology was then performed to assess the topography and mechanical wear of the telescopic bars, using a Talyrond 365 (Taylor Hobson, Leicester, UK) roundness measuring machine.
Results: Plain radiographs showed evidence of a broken internal mechanism in 29% of retrieved rods. Single-side wear marks were found in 97% of retrieved rods. Material loss was found to significantly increase in rods with a damaged internal mechanism (p<0.05) and rods with longer time in situ (r=0.692, p<0.05).
Conclusion: We found an association between damage to the internal mechanism of the rods and (1) patterns of single-side longitudinal wear marks and (2) increased material loss. As the material loss was also found to increase over time of rod in situ, we emphasise the importance of early detection and revision of failed MAGEC rods in clinical practice.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11