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Published in: Knee Surgery, Sports Traumatology, Arthroscopy 5/2017

01-05-2017 | Knee

Impingement following anterior cruciate ligament reconstruction: comparing the direct versus indirect femoral tunnel position

Authors: J. P. van der List, H. A. Zuiderbaan, D. H. Nawabi, A. D. Pearle

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 5/2017

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Abstract

Purpose

During anterior cruciate ligament (ACL) reconstruction, authors have suggested inserting the femoral tunnel at the biomechanically relevant direct fibres, but this higher position can cause more impingement. Therefore, we aimed to assess ACL graft impingement at the femoral notch for ACL reconstruction at both the direct and indirect tunnel positions.

Methods

A virtual model was created for twelve cadaveric knees with computed tomography scanning in which a virtual graft was placed at direct and indirect tunnel positions of the anteromedial bundle (AM), posterolateral bundle (PL) or centre of the both bundles (C). In these six tunnel positions, the volume (mm3) and mid-point location of impingement (°) were measured at different flexion angles.

Results

Generally, more impingement was seen with the indirect position compared with the direct position although this was only significant at 90° of flexion for the AM position (97 ± 28 vs. 76 ± 20 mm3, respectively; p = 0.046). The direct tunnel position impinged higher at the notch, whereas the indirect position impinged more towards the lateral wall, but this was only significant at 90° of flexion for the AM (24 ± 5° vs. 34 ± 4°, respectively; p < 0.001) and C position (34 ± 5° vs. 42 ± 5°, respectively; p = 0.003).

Conclusion

In this cadaveric study, the direct tunnel position did not cause more impingement than the indirect tunnel position. Based on these results, graft impingement is not a limitation to reconstruct the femoral tunnel at the insertion of the biomechanically more relevant direct fibres.
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Metadata
Title
Impingement following anterior cruciate ligament reconstruction: comparing the direct versus indirect femoral tunnel position
Authors
J. P. van der List
H. A. Zuiderbaan
D. H. Nawabi
A. D. Pearle
Publication date
01-05-2017
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 5/2017
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-015-3897-9

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