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Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy 12/2018

04.05.2018 | Knee

In-vivo three-dimensional MR imaging of the intact anterior cruciate ligament shows a variable insertion pattern of the femoral and tibial footprints

verfasst von: S. U. Scheffler, K. Maschewski, R. Becker, P. Asbach

Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy | Ausgabe 12/2018

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Abstract

Purpose

Failure to reconstruct the natural footprints of the ruptured anterior cruciate ligament (ACL) may lead to premature graft-failure. Therefore, precise analyses of insertion site anatomy and inter-individual variations of the morphology of the ACL are highly important to facilitate optimal individualized graft placement. Therefore, the purpose of this study was to analyze the inter-individual variation of the morphology of the femoral and tibial ACL footprints.

Methods

Thirty subjects with an intact ACL were included in this study for MR imaging of their knee joint. A three-dimensional (3D) dual-echo steady-state sequence with near 0.8 mm isotropic resolution was acquired on a 3 T system with a 15-channel knee-coil. The ACL was subsequently manually segmented using dedicated medical imaging software (VitreaAdvanced®, Vital Images). The lengths and widths of the footprints were measured after reconstructing an axial oblique (tibial footprint) or coronal oblique (femoral footprint) section at the bone–ligament junction and descriptive analysis was conducted to describe morphology orientation of the footprint.

Results

The femoral footprint measured on average 14 mm ± 2 mm (range 8–19 mm) in length and 5 mm ± 1 mm (range 3–8 mm) in width. The mean value of the tibial footprint measured 10 mm ± 2 mm (range 5–14 mm) in length and 7 mm ± 2 mm (range 5–13 mm) in width. Descriptive analysis showed a stretched, ribbon-like appearance of the femoral footprint, while the tibial footprint revealed larger variability, stretching from anterolateral to posteromedial around the anterior horn of the lateral meniscus.

Conclusion

3D imaging of the ACL footprints reveals a distinct difference in insertion site morphology and fiber bundle orientation between the femoral and tibial footprint. This questions the concept of strict anatomical separation of the ACL into an anteromedial and posterolateral bundle.
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Metadaten
Titel
In-vivo three-dimensional MR imaging of the intact anterior cruciate ligament shows a variable insertion pattern of the femoral and tibial footprints
verfasst von
S. U. Scheffler
K. Maschewski
R. Becker
P. Asbach
Publikationsdatum
04.05.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Knee Surgery, Sports Traumatology, Arthroscopy / Ausgabe 12/2018
Print ISSN: 0942-2056
Elektronische ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-018-4939-x

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