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Tunnel placement in ACL reconstruction surgery : smaller inter-tunnel angles and higher peak forces at the femoral tunnel using anteromedial portal femoral drilling : a 3D and finite element analysis

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Abstract
Purpose: Recent studies have emphasized the importance of anatomical ACL reconstruction to restore normal knee kinematics and stability. Aim of this study is to evaluate and compare the ability of the anteromedial (AM) and transtibial (TT) techniques for ACL reconstruction to achieve anatomical placement of the femoral and tibial tunnel within the native ACL footprint and to determine forces within the graft during functional motion. As the AM technique is nowadays the technique of choice, the hypothesis is that there are significant differences in tunnel features, reaction forces and/or moments within the graft when compared to the TT technique. Methods: Twenty ACL-deficient patients were allocated to reconstruction surgery with one of both techniques. Postoperatively, all patients underwent a computed tomography scan (CT) allowing 3D reconstruction to analyze tunnel geometry and tunnel placement within the native ACL footprint. A patient-specific finite element analysis (FEA) was conducted to determine reaction forces and moments within the graft during antero-posterior translation and pivot-shift motion. Results: With significantly shorter femoral tunnels (p<0.001) and a smaller inter-tunnel angle (p<0.001), the AM technique places tunnels with less variance, close to the anatomical centre of the ACL footprints when compared to the TT technique. Using the latter, tibial tunnels were more medialised (p=0.007) with a higher position of the femoral tunnels (p=0.02). FEA showed the occurrence of higher, but non-significant, reaction forces in the graft, especially on the femoral side and lower, however, statistically not significant, reaction moments using the AM technique. Conclusion: This study indicates important, technique-dependent differences in tunnel features with changes in reaction forces and moments within the graft. Level of evidence: II.
Keywords
Anterior cruciate ligament, Reconstruction, Transtibial, Anteromedial, Footprint, 3D, FEA, ANTERIOR CRUCIATE LIGAMENT, ORIENTATION, INSERTIONS, KINEMATICS, REVISION, LENGTH

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MLA
Tampere, Thomas, et al. “Tunnel Placement in ACL Reconstruction Surgery : Smaller Inter-Tunnel Angles and Higher Peak Forces at the Femoral Tunnel Using Anteromedial Portal Femoral Drilling : A 3D and Finite Element Analysis.” KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, vol. 27, no. 8, 2019, pp. 2568–76.
APA
Tampere, T., DeVriendt, W., Cromheecke, M., Luyckx, T., Verstraete, M., & Victor, J. (2019). Tunnel placement in ACL reconstruction surgery : smaller inter-tunnel angles and higher peak forces at the femoral tunnel using anteromedial portal femoral drilling : a 3D and finite element analysis. KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, 27(8), 2568–2576.
Chicago author-date
Tampere, Thomas, Wouter DeVriendt, Michiel Cromheecke, Thomas Luyckx, Matthias Verstraete, and Jan Victor. 2019. “Tunnel Placement in ACL Reconstruction Surgery : Smaller Inter-Tunnel Angles and Higher Peak Forces at the Femoral Tunnel Using Anteromedial Portal Femoral Drilling : A 3D and Finite Element Analysis.” KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY 27 (8): 2568–76.
Chicago author-date (all authors)
Tampere, Thomas, Wouter DeVriendt, Michiel Cromheecke, Thomas Luyckx, Matthias Verstraete, and Jan Victor. 2019. “Tunnel Placement in ACL Reconstruction Surgery : Smaller Inter-Tunnel Angles and Higher Peak Forces at the Femoral Tunnel Using Anteromedial Portal Femoral Drilling : A 3D and Finite Element Analysis.” KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY 27 (8): 2568–2576.
Vancouver
1.
Tampere T, DeVriendt W, Cromheecke M, Luyckx T, Verstraete M, Victor J. Tunnel placement in ACL reconstruction surgery : smaller inter-tunnel angles and higher peak forces at the femoral tunnel using anteromedial portal femoral drilling : a 3D and finite element analysis. KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY. 2019;27(8):2568–76.
IEEE
[1]
T. Tampere, W. DeVriendt, M. Cromheecke, T. Luyckx, M. Verstraete, and J. Victor, “Tunnel placement in ACL reconstruction surgery : smaller inter-tunnel angles and higher peak forces at the femoral tunnel using anteromedial portal femoral drilling : a 3D and finite element analysis,” KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, vol. 27, no. 8, pp. 2568–2576, 2019.
@article{8580537,
  abstract     = {Purpose: Recent studies have emphasized the importance of anatomical ACL reconstruction to restore normal knee kinematics and stability. Aim of this study is to evaluate and compare the ability of the anteromedial (AM) and transtibial (TT) techniques for ACL reconstruction to achieve anatomical placement of the femoral and tibial tunnel within the native ACL footprint and to determine forces within the graft during functional motion. As the AM technique is nowadays the technique of choice, the hypothesis is that there are significant differences in tunnel features, reaction forces and/or moments within the graft when compared to the TT technique.
Methods: Twenty ACL-deficient patients were allocated to reconstruction surgery with one of both techniques. Postoperatively, all patients underwent a computed tomography scan (CT) allowing 3D reconstruction to analyze tunnel geometry and tunnel placement within the native ACL footprint. A patient-specific finite element analysis (FEA) was conducted to determine reaction forces and moments within the graft during antero-posterior translation and pivot-shift motion.
Results: With significantly shorter femoral tunnels (p<0.001) and a smaller inter-tunnel angle (p<0.001), the AM technique places tunnels with less variance, close to the anatomical centre of the ACL footprints when compared to the TT technique. Using the latter, tibial tunnels were more medialised (p=0.007) with a higher position of the femoral tunnels (p=0.02). FEA showed the occurrence of higher, but non-significant, reaction forces in the graft, especially on the femoral side and lower, however, statistically not significant, reaction moments using the AM technique.
Conclusion: This study indicates important, technique-dependent differences in tunnel features with changes in reaction forces and moments within the graft.
Level of evidence: II.},
  author       = {Tampere, Thomas and DeVriendt, Wouter and Cromheecke, Michiel and Luyckx, Thomas and Verstraete, Matthias and Victor, Jan},
  issn         = {0942-2056},
  journal      = {KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY},
  keywords     = {Anterior cruciate ligament,Reconstruction,Transtibial,Anteromedial,Footprint,3D,FEA,ANTERIOR CRUCIATE LIGAMENT,ORIENTATION,INSERTIONS,KINEMATICS,REVISION,LENGTH},
  language     = {eng},
  number       = {8},
  pages        = {2568--2576},
  title        = {Tunnel placement in ACL reconstruction surgery : smaller inter-tunnel angles and higher peak forces at the femoral tunnel using anteromedial portal femoral drilling : a 3D and finite element analysis},
  url          = {http://dx.doi.org/10.1007/s00167-018-5272-0},
  volume       = {27},
  year         = {2019},
}

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