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Open Access 01-12-2024 | Original article

Risk factors for proximal radial abnormalities in children with untreated chronic Monteggia fractures: a review of 142 cases

Authors: WenTao Wang, QianQian Mei, Hang Liu, YueMing Guo, HaiBo Mei, Federico Canavese, Antonio Andreacchio, HanQing Lyu, ShunYou Chen, ShengHua He

Published in: Journal of Orthopaedics and Traumatology | Issue 1/2024

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Abstract

Background

The risk factors for proximal radial abnormalities (PRA) in paediatric patients with untreated chronic Monteggia fractures (CMFs) are unclear. This multicentre study aimed to evaluate the risk factors for PRA in children with untreated CMFs.

Materials and methods

The clinical data of 142 patients (mean age at the time of injury: 5.73 years) with untreated unilateral CMFs were retrospectively reviewed. The radial neck-shaft angle (RNSAP) and radial head size (RHL) were measured on anteroposterior (AP) and lateral (L) radiographs, respectively. The RHL size was the ratio of the widest width of the proximal radial metaphysis to the narrowest radial neck width. The En-RNSAP and En-RHL were the ratios of the enlargement (En) of the RNSAP angle and RHL size of the injured elbow to those of the uninjured elbow, respectively. Paired-sample t-tests, single-factor analyses and multiple linear regression analyses were performed to evaluate the correlation between the differences in these parameters between the injured and uninjured elbows and the assessed risk factors. These risk factors included institution, sex, laterality, age at injury, time from injury to diagnosis, direction of RH dislocation, distance of RH dislocation (DD-RH), presence of radial or median nerve injury, heterotopic ossification and immobilization of the elbow after injury.

Results

In children with untreated CMFs (mean time from injury to diagnosis: 14.6 months), Student’s t-test revealed a significant difference in the RHL size (P < 0.001) but not in the RNSAP angle (P = 0.075) between the injured and uninjured elbows. Pearson correlation analysis revealed a potential correlation between En-RHL and age at the time of injury (P = 0.069), time from injury to diagnosis (P < 0.001) and DD-RH (P < 0.001), excluding other risk factors (P > 0.05). Multiple linear regression analysis revealed that age at the time of injury (P = 0.047), time from injury to diagnosis (P = 0.007) and DD-RH (P = 0.001) were risk factors for an increased En-RHL in patients with untreated CMFs; the variability in En-RHL among the other three risk factors was 21.4%.

Conclusions

In paediatric patients with unilateral untreated CMFs, PRA of the injured elbow consisted mainly of RH enlargement or radial neck narrowing rather than valgus deformities of the proximal radius. Older age at injury, increased time from injury to diagnosis and DD-RH were risk factors for more severe PRA.

Level of evidence

III.
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Metadata
Title
Risk factors for proximal radial abnormalities in children with untreated chronic Monteggia fractures: a review of 142 cases
Authors
WenTao Wang
QianQian Mei
Hang Liu
YueMing Guo
HaiBo Mei
Federico Canavese
Antonio Andreacchio
HanQing Lyu
ShunYou Chen
ShengHua He
Publication date
01-12-2024
Publisher
Springer International Publishing
Published in
Journal of Orthopaedics and Traumatology / Issue 1/2024
Print ISSN: 1590-9921
Electronic ISSN: 1590-9999
DOI
https://doi.org/10.1186/s10195-024-00793-z