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BMC Musculoskeletal Disorders

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Open Access 01-12-2021 | Clavicle Fracture | Research article

Comparing the locking screw direction of three locking plates for lateral clavicle fractures: a simulation study

Authors: Shingo Abe, Kota Koizumi, Tsuyoshi Murase, Kohji Kuriyama

Published in: BMC Musculoskeletal Disorders | Issue 1/2021

Abstract

Background

The locking plate is a useful treatment for lateral clavicle fractures, however, there are limits to the fragment size that can be fixed. The current study aimed to measure the screw angles of three locking plates for lateral clavicle fractures. In addition, to assess the number of screws that can be inserted in different fragment sizes, to elucidate the size limits for locking plate fixation.

Methods

The following three locking plates were analyzed: the distal clavicle plate [Acumed, LLC, Oregon, the USA], the LCP clavicle plate lateral extension [Depuy Synthes, LLC, PA, the USA], and the HAI clavicle plate [HOMS Engineering, Inc., Nagano, Japan]. We measured the angles between the most medial and lateral locking screws in the coronal plane and between the most anterior and posterior locking screws in the sagittal plane. A computer simulation was used to position the plates as laterally as possible in ten normal three-dimensional clavicle models. Lateral fragment sizes of 10, 15, 20, 25, and 30 mm were simulated in the acromioclavicular joint, and the number of screws that could be inserted in the lateral fragment was assessed. Subsequently, the area covered by the locking screws on the inferior surface of the clavicle was measured.

Results

The distal clavicle plate had relatively large screw angles (20° in the coronal plane and 32° in the sagittal plane). The LCP clavicle lateral extension had a large angle (38°) in the sagittal plane. However, the maximum angle of the HAI clavicle plate was 13° in either plane. The distal clavicle plate allowed most screws to be inserted in each size of bone fragment. For all locking plates, all screws could be inserted in 25 mm fragments. The screws of distal clavicle plate covered the largest area on the inferior surface of the clavicle.

Conclusions

Screw angles and the numbers of screws that could be inserted in the lateral fragment differed among products. Other augmented fixation procedures should be considered for fractures with fragment sizes < 25 mm that cannot be fixed with a sufficient number of screws.

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Title: Comparing the locking screw direction of three locking plates for lateral clavicle fractures: a simulation study
Authors: Shingo Abe
Kota Koizumi
Tsuyoshi Murase
Kohji Kuriyama
Publication date: 01-12-2021
Publisher: BioMed Central
Keyword: Clavicle Fracture
Published in: BMC Musculoskeletal Disorders / Issue 1/2021
Electronic ISSN: 1471-2474
DOI: https://doi.org/10.1186/s12891-021-04697-5

At a glance: The STEP trials

Springer Medicine

Comparing the locking screw direction of three locking plates for lateral clavicle fractures: a simulation study

Abstract

Background

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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