Abstract
Purpose
To (1) evaluate the optimal drill orientation of the anterolateral ligament (ALL) femoral tunnel to minimize collision with the anterior cruciate ligament (ACL) femoral tunnel during anatomical ACL reconstruction according to the need for far-cortex drilling and (2) investigate the geometric factors that affect tunnel collision secondary to drill orientation of the ALL femoral tunnel.
Methods
A three-dimensional femoral model of patients who underwent anatomical single-bundle ACL reconstruction between 2015 and 2016 was constructed, and the geometric factors were evaluated. Virtual ALL femoral tunnels were created to simulate 45 drilling conditions. For each condition, whether the virtual ALL femoral tunnel and its trajectory violated the femoral cortex and the minimum distance between tunnels was investigated.
Results
Thirty-nine subjects were included. Overall violation rates of the femoral cortex by the ALL tunnels and its trajectories were 11.1% (195 of 1755 conditions) and 40.7% (714 of 1755 conditions), respectively. A drilling angle of axial 0° and coronal − 40° showed the longest minimum distance between tunnels without femoral cortex violation by the ALL tunnel (6.3 ± 4.0 mm; collision rate 2.6% [1 of 39 subjects]). With simultaneous consideration of the ALL tunnel’s trajectory representing far-cortex drilling, a drill angle of axial 40° and coronal 10° showed the longest minimum distance between tunnels without femoral cortex violation (0.6 ± 3.9 mm; collision rate 38.5% [15 of 39 subjects]). For surgical techniques requiring far-cortex drilling, regression analyses were performed on geometric factors that could affect tunnel collision, which revealed that the sagittal inclination angle of the ACL and the distance between the ACL femoral tunnel’s outlet and ALL’s femoral attachment were associated with tunnel collision.
Conclusion
The optimal drill orientations of the ALL femoral tunnel to minimize collision with the ACL femoral tunnel were axial 0° and coronal − 40° for surgical techniques not requiring far-cortex drilling and axial 40° and coronal 10° for techniques requiring far-cortex drilling. For techniques requiring far-cortex drilling, additional adjustment for orientation of the ACL femoral tunnel is required to reduce the risk of tunnel collision. Therefore, an individualized surgical strategy should be applied according to the graft fixation method of the ALL femoral tunnel.
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Discover the latest articles, news and stories from top researchers in related subjects.Abbreviations
- ALL:
-
Anterolateral ligament
- ACL:
-
Anterior cruciate ligament
- FCD:
-
Far-cortex drilling
- CT:
-
Computed tomography
- 3D:
-
Three dimensional
- MDBT:
-
Minimum distance between tunnels
- CI:
-
Confidence interval
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Each author certifies that he or she has no commercial associations (e.g., consultancies, stock ownership, equity interest, and patent/licensing arrangements) that might pose a conflict of interest in connection with the submitted article. There were no external sources of funding and none of the authors had any conflicts of interest.
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The project was coordinated by HS Moon, CH Choi, and SH Kim. HS Moon drafted the manuscript, together with YJ Seo, YH Lee, and M Jung. HS Moon and SH Kim generated the concept of the study. The acquisition of data and analysis was done by HS Moon and JH Park. The design of the study and interpretation of data were all done jointly by all authors. HS Moon and SH Kim revised the final draft critically for important intellectual content and approved the version to be submitted. We have read and understood your journal’s policies, and we believe that neither the manuscript nor the study violates any of these.
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Moon, HS., Choi, CH., Seo, YJ. et al. The orientation of the ALL femoral tunnel to minimize collision with the ACL tunnel depends on the need or not of far-cortex drilling. Knee Surg Sports Traumatol Arthrosc 30, 3805–3817 (2022). https://doi.org/10.1007/s00167-022-07007-1
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DOI: https://doi.org/10.1007/s00167-022-07007-1