Abstract
Background and purpose
Ankle sprain is often attributed to damage of the anterior and posterior talofibular ligaments (ATFL, PTFL). We compared the morphology of these ligaments in fetuses of different gestational ages (GAs) with the horizontal configuration in adults.
Materials and methods
Histological sections of unilateral ankles were examined in 22 fetuses, 10 at GA of 9–12 weeks and 12 at GA of 26–39 weeks.
Results
At a GA of 9 to 10 weeks, the ATFL and PTFL consisted of horizontally running straight fibers. The initial ATFL appeared as a thickening of the capsule of the talocrural joint, although the initial PTFL was distant from this joint. Until a GA of 12 weeks, the talus and fibula were separated by an expanding joint cavity. Thus, the initial horizontal ligaments were “pulled” in a distal direction. The distal parts of the ligaments consisted of thin collagenous fibers that had an irregular array, whereas the short proximal parts had thick fibers and a horizontal array. In near-term fetuses, the ligaments contained no horizontal fibers. The ATFL had a wavy course around the thick synovial fold, and was exposed to the joint cavity along the entire course; the distal part was thinner than the proximal part. The PTFL was bulky and consisted of fibers with an irregular array. Therefore, the morphology in a near-term fetus was quite different from that in adults.
Conclusion
The horizontal and straight composite ankle fibers in adults apparently result from postnatal reconstruction, depending on mechanical demand.
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Data availability
All data used in this work are available for verification upon request.
Abbreviations
- ATFL:
-
Anterior talofibular ligament
- CFL:
-
Calcaneofibular ligament
- CRL:
-
Crown-rump length
- FBT:
-
Fibularis brevis tendon or muscle belly
- GA:
-
Gestational age
- FLT:
-
Fibularis longus tendon
- PTFL:
-
Posterior talofibular ligament
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Funding
This study was supported in part by a Grant-in-Aid for Scientific Research (JSPS KAKENHI No. 16K08435; to Hiroshi Abe) from the Ministry of Education, Culture, Sports, Science and Technology in Japan.
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JHK: project development, data collection, data analysis, manuscript writing. SH: data collection, data analysis, manuscript editing. GM: project development, data collection, data analysis, manuscript writing. JFR-V: data collection, data analysis, manuscript editing. HA: project development, data analysis, manuscript editing. All authors read and approved the final manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. The use of materials for research was approved by the Ethics Committee of Complutense University (B08/374) and Akita University (No. 1428).
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Kim, J.H., Jin, ZW., Hayashi, S. et al. Major change in morphology of the talofibular ligaments during fetal development and growth. Surg Radiol Anat 44, 1121–1129 (2022). https://doi.org/10.1007/s00276-022-02987-8
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DOI: https://doi.org/10.1007/s00276-022-02987-8