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Article: 'Law of Temporary Diminishing Distraction Gains': The Phenomenon of Temporary Diminished Distraction Lengths With Magnetically Controlled Growing Rods That Is Reverted With Rod Exchange
Title | 'Law of Temporary Diminishing Distraction Gains': The Phenomenon of Temporary Diminished Distraction Lengths With Magnetically Controlled Growing Rods That Is Reverted With Rod Exchange |
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Authors | |
Keywords | MCGR Magnetically controlled growing rod Distraction Lengthening Law of temporary diminishing distraction gains |
Issue Date | 2020 |
Publisher | SAGE Publications (UK and US): Open Access Titles. The Journal's web site is located at http://journals.sagepub.com/loi/gsj |
Citation | Global Spine Journal, 2020 How to Cite? |
Abstract | Study Design:
Prospective study.
Objectives:
To study the increasing divergence between targeted and achieved distractions observed with magnetically controlled growing rod (MCGR)lengthening, and the relationship of this reduced rate of achieved lengthening with remaining rod length.
Methods:
Patients with early onset scoliosis (EOS) who underwent MCGRs with minimum 2-year follow-up were consecutively enrolled. Targeted and achieved lengths were compared. Correlation between percentage of lengthening achieved from targeted length was identified with the timing of rod exchanges.
Results:
A total of 20 patients fulfilled the inclusion criteria. The mean age at index surgery was 9.5 years and mean postoperative follow-up was 68 ± 28 months. Of these, 8 patients had at least one rod exchange that occurred at 23 ± 4 months. A decrease in rate of achieved lengthening was observed when compared with targeted distractions. The achieved lengthening drops from 86% of targeted length at the first distraction to only 58.8% at the 21st distraction episode for the first set of rods. After rod exchange, the average achieved lengthening went back up to 81.3% of the targeted length but subsequently had a gradual reduction to 35% at the 19th distraction episode.
Conclusions:
We propose a “law of temporary diminishing distraction gains” that MCGR users should be aware of when monitoring rod lengthening. Diminishing distraction length gains is observed as the rod is lengthened and is a phenomenon independent of patient factors. It is only temporary as the rates of achieved lengthening returns to baseline after rod exchange. |
Persistent Identifier | http://hdl.handle.net/10722/286256 |
ISSN | 2023 Impact Factor: 2.6 2023 SCImago Journal Rankings: 1.264 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Cheung, JPY | - |
dc.contributor.author | Bow, C | - |
dc.contributor.author | Cheung, KMC | - |
dc.date.accessioned | 2020-08-31T07:01:23Z | - |
dc.date.available | 2020-08-31T07:01:23Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Global Spine Journal, 2020 | - |
dc.identifier.issn | 2192-5682 | - |
dc.identifier.uri | http://hdl.handle.net/10722/286256 | - |
dc.description.abstract | Study Design: Prospective study. Objectives: To study the increasing divergence between targeted and achieved distractions observed with magnetically controlled growing rod (MCGR)lengthening, and the relationship of this reduced rate of achieved lengthening with remaining rod length. Methods: Patients with early onset scoliosis (EOS) who underwent MCGRs with minimum 2-year follow-up were consecutively enrolled. Targeted and achieved lengths were compared. Correlation between percentage of lengthening achieved from targeted length was identified with the timing of rod exchanges. Results: A total of 20 patients fulfilled the inclusion criteria. The mean age at index surgery was 9.5 years and mean postoperative follow-up was 68 ± 28 months. Of these, 8 patients had at least one rod exchange that occurred at 23 ± 4 months. A decrease in rate of achieved lengthening was observed when compared with targeted distractions. The achieved lengthening drops from 86% of targeted length at the first distraction to only 58.8% at the 21st distraction episode for the first set of rods. After rod exchange, the average achieved lengthening went back up to 81.3% of the targeted length but subsequently had a gradual reduction to 35% at the 19th distraction episode. Conclusions: We propose a “law of temporary diminishing distraction gains” that MCGR users should be aware of when monitoring rod lengthening. Diminishing distraction length gains is observed as the rod is lengthened and is a phenomenon independent of patient factors. It is only temporary as the rates of achieved lengthening returns to baseline after rod exchange. | - |
dc.language | eng | - |
dc.publisher | SAGE Publications (UK and US): Open Access Titles. The Journal's web site is located at http://journals.sagepub.com/loi/gsj | - |
dc.relation.ispartof | Global Spine Journal | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | MCGR | - |
dc.subject | Magnetically controlled growing rod | - |
dc.subject | Distraction | - |
dc.subject | Lengthening | - |
dc.subject | Law of temporary diminishing distraction gains | - |
dc.title | 'Law of Temporary Diminishing Distraction Gains': The Phenomenon of Temporary Diminished Distraction Lengths With Magnetically Controlled Growing Rods That Is Reverted With Rod Exchange | - |
dc.type | Article | - |
dc.identifier.email | Cheung, JPY: cheungjp@hku.hk | - |
dc.identifier.email | Cheung, KMC: cheungmc@hku.hk | - |
dc.identifier.authority | Cheung, JPY=rp01685 | - |
dc.identifier.authority | Cheung, KMC=rp00387 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1177/2192568220948475 | - |
dc.identifier.pmid | 32799681 | - |
dc.identifier.scopus | eid_2-s2.0-85089488776 | - |
dc.identifier.hkuros | 313255 | - |
dc.identifier.isi | WOS:000563369800001 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 2192-5682 | - |