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The anterolateral ligament of the knee is not a solid structure in human fetuses

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Abstract

Purpose

The purpose of this study was to investigate if the anterolateral ligament of the knee (ALL) is present in the human fetus and describe its topography along with other structures of the region.

Methods

Forty human fetuses knee joints, at mean age 34 weeks (± 2.57 weeks), fixed in 10% formalin, were submitted to cross-sectional dissection and mesoscopic analysis.

Results

The ALL was not identified, although the usual topography of the region was identified in all specimens: skin, subcutaneous tissue, iliotibial tract (ITT), fibular collateral ligament, popliteal muscle tendon, lateral meniscus, patellar ligament, infrapatellar fat pad, lateral patellar retinaculum, knee joint capsule, lateral inferior genicular vessels, and the biceps femoris tendon. The ITT reveals anterior (n = 12) and lateral thickening (n = 17) in some specimens. This thickening was found in both knees of the same subject in 6/20 specimens.

Conclusion

The anterolateral ligament of the knee is not a congenital or solid structure. Our results suggest that the ALL may be a deep layer of the ITT or part of the knee joint capsule, or its identification is evaluator dependent.

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Acknowledgements

The authors greatly appreciate the technicians of the Department of Morphology (Universidade Federal do Espirito Santo) for their assistance with the materials. The authors also would like to state gratitude for the anonymous families who generously donated the bodies so that this study could be carried out.

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The authors have no funding to report.

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All the authors performed the data analysis/interpretation, drafted the manuscript, criticized and review the versions of the manuscript, and approved the final version of the paper. The first author was responsible for data acquisition.

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Correspondence to Josemberg da Silva Baptista.

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Delpupo, F.V.B., de Fúcio Lizardo, J.H. & Baptista, J.d. The anterolateral ligament of the knee is not a solid structure in human fetuses. Surg Radiol Anat 43, 1117–1122 (2021). https://doi.org/10.1007/s00276-020-02665-7

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