Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

MRI-Based Evaluation of the Flexor Digitorum Superficialis Anatomy: Investigating the Prevalence and Morphometry of the “Chiasma Antebrachii”

Clara Dorothea Elsner
* ,
Andreas Steven Kunz
,
Nicole Wagner
,
Henner Huflage
ORCID logo ,
Stefan Hübner
,
Karsten Sebastian Luetkens
ORCID logo ,
Thorsten Alexander Bley
,
Rainer Schmitt
,
Süleyman Ergün
,
Jan-Peter Grunz
ORCID logo
Version 1 : Received: 14 June 2023 / Approved: 15 June 2023 / Online: 15 June 2023 (11:25:33 CEST)

How to cite: Elsner, C.D.; Kunz, A.S.; Wagner, N.; Huflage, H.; Hübner, S.; Luetkens, K.S.; Bley, T.A.; Schmitt, R.; Ergün, S.; Grunz, J. MRI-Based Evaluation of the Flexor Digitorum Superficialis Anatomy: Investigating the Prevalence and Morphometry of the “Chiasma Antebrachii”. Preprints 2023, 2023061130. https://doi.org/10.20944/preprints202306.1130.v1 Elsner, C.D.; Kunz, A.S.; Wagner, N.; Huflage, H.; Hübner, S.; Luetkens, K.S.; Bley, T.A.; Schmitt, R.; Ergün, S.; Grunz, J. MRI-Based Evaluation of the Flexor Digitorum Superficialis Anatomy: Investigating the Prevalence and Morphometry of the “Chiasma Antebrachii”. Preprints 2023, 2023061130. https://doi.org/10.20944/preprints202306.1130.v1

Abstract

Recent dissection studies resulted in the introduction of the term “chiasma antebrachii”, which represents an intersection of the flexor digitorum superficialis (FDS) tendons for digit 2 and 3 in the distal third of the forearm. This retrospective investigation aimed to provide an MRI-based morphologic analysis of the chiasma antebrachii. In 89 patients (41 women, 39.3±21.3 years), MRI examinations of the forearm (2010–2021) were reviewed by two radiologists, who evaluated all studies for the presence and length of the chiasma as well as its distance from the distal radioulnar and elbow joint. The chiasma antebrachii was identified in the distal third of the forearm in 88 patients (98.9%), while one intersection was located more proximally in the middle part. The chiasma had a median length of 28 mm (interquartile range: 24–35 mm). Its distances to the distal radioulnar and elbow joint were 16 mm (8–25 mm) and 215 mm (187–227 mm), respectively. T1-weighted post-contrast sequences were found to be superior to T2- or proton density-weighted sequences in 71 cases (79.8%). Concluding, the chiasma antebrachii is part of the standard FDS anatomy. Knowledge of its morphology is important, e.g. in targeted injections of therapeutics or reconstructive surgery.

Keywords

Flexor digitorum superficialis; Flexor tendon; Anatomy; Magnetic resonance imaging

Subject

Medicine and Pharmacology, Anatomy and Physiology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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