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BMC Musculoskeletal Disorders

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Open Access 01-12-2021 | Extensor Tendon | Research article

Effect of oblique headless compression screw fixation for metacarpal shaft fracture: a biomechanical in vitro study

Authors: Yung-Cheng Chiu, Tsung-Yu Ho, Yen-Nien Ting, Ming-Tzu Tsai, Heng-Li Huang, Cheng-En Hsu, Jui-Ting Hsu

Published in: BMC Musculoskeletal Disorders | Issue 1/2021

Abstract

Background

Metacarpal shaft fracture is a common fracture in hand trauma injuries. Surgical intervention is indicated when fractures are unstable or involve considerable displacement. Current fixation options include Kirschner wire, bone plates, and intramedullary headless screws. Common complications include joint stiffness, tendon irritation, implant loosening, and cartilage damage.

Objective

We propose a modified fixation approach using headless compression screws to treat transverse or short-oblique metacarpal shaft fracture.

Materials and methods

We used a saw blade to model transverse metacarpal neck fractures in 28 fresh porcine metacarpals, which were then treated with the following four fixation methods: (1) locked plate with five locked bicortical screws (LP group), (2) regular plate with five bicortical screws (RP group), (3) two Kirschner wires (K group), and (4) a headless compression screw (HC group). In the HC group, we proposed a novel fixation model in which the screw trajectory was oblique to the long axis of the metacarpal bone. The entry point of the screw was in the dorsum of the metacarpal neck, and the exit point was in the volar cortex of the supracondylar region; thus, the screw did not damage the articular cartilage. The specimens were tested using a modified three-point bending test on a material testing system. The maximum fracture forces and stiffness values of the four fixation types were determined by observing the force–displacement curves. Finally, the Kruskal–Wallis test was adopted to process the data, and the exact Wilcoxon rank sum test with Bonferroni adjustment was performed to conduct paired comparisons among the groups.

Results

The maximum fracture forces (median ± interquartile range [IQR]) of the LP, RP, HC, and K groups were 173.0 ± 81.0, 156.0 ± 117.9, 60.4 ± 21.0, and 51.8 ± 60.7 N, respectively. In addition, the stiffness values (median ± IQR) of the LP, HC, RP, and K groups were 29.6 ± 3.0, 23.1 ± 5.2, 22.6 ± 2.8, and 14.7 ± 5.6 N/mm, respectively.

Conclusion

Headless compression screw fixation provides fixation strength similar to locked and regular plates for the fixation of metacarpal shaft fractures. The headless screw was inserted obliquely to the long axis of the metacarpal bone. The entry point of the screw was in the dorsum of the metacarpal neck, and the exit point was in the volar cortex of the supracondylar region; therefore the articular cartilage iatrogenic injury can be avoidable. This modified fixation method may prevent tendon irritation and joint cartilage violation caused by plating and intramedullary headless screw fixation.

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Title: Effect of oblique headless compression screw fixation for metacarpal shaft fracture: a biomechanical in vitro study
Authors: Yung-Cheng Chiu
Tsung-Yu Ho
Yen-Nien Ting
Ming-Tzu Tsai
Heng-Li Huang
Cheng-En Hsu
Jui-Ting Hsu
Publication date: 01-12-2021
Publisher: BioMed Central
Keyword: Extensor Tendon
Published in: BMC Musculoskeletal Disorders / Issue 1/2021
Electronic ISSN: 1471-2474
DOI: https://doi.org/10.1186/s12891-020-03939-2

At a glance: The STEP trials

Springer Medicine

Effect of oblique headless compression screw fixation for metacarpal shaft fracture: a biomechanical in vitro study

Abstract

Background

Objective

Materials and methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Objective

Materials and methods

Results

Conclusion

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