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The effect of notchplasty in anterior cruciate ligament reconstruction: a biomechanical study in the porcine knee

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Introduction

Notchplasty is frequently performed by many orthopaedic surgeons during anterior cruciate ligament (ACL) reconstruction. The effect of notchplasty on tunnel placement and knee biomechanics with ACL reconstruction is not known.

Methods

Twelve (n = 12) porcine knees were tested using a robotic testing system. Four knee states were compared: (1) intact ACL, (2) ACL-deficient, (3) anatomic single bundle (SB) ACL reconstruction and (4) anatomic SB ACL reconstruction with a 5-mm notchplasty. The graft was fixed at 60° of flexion (full extension of porcine knee is 30°) with an 80-N tension. The knees were subjected to two loading conditions: an 89-N anterior tibial load (ATT) and 4 Nm internal (IR) and external tibial (ER) rotational torques. The kinematics and in situ force obtained from the different knee conditions were compared.

Results

There were no significant differences between pre- and post-notchplasty in the ER at 30° and 60° of knee flexion (n.s.). However, a significant difference was found between pre- and post-notchplasty in ATT at 30° and 60° of flexion (p < 0.05). The in situ force in the anatomic SB reconstruction with notchplasty was significant lower than the intact and anatomic reconstructed ACL pre-notchplasty at 30°, 60° and 90° of knee flexion (p < 0.05). In response to the IR tibial torque, there were significant differences between pre- and post-notchplasty in IR at 60° (p < 0.05) of knee flexion.

Conclusion

Notchplasty had greater effect on anterior stability than rotational stability. This change in knee kinematics could be detrimental to a healing bone graft, ligamentization and could lead to failure of the reconstruction in early post-operative period.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, University of Pittsburgh, 3471 Fifth Avenue Suite 1011, Pittsburgh, PA, 15213, USA

    Kenan Keklikci, Can Yapici, Donghwi Kim, Monica Linde-Rosen, Patrick Smolinski & Freddie H. Fu

  2. Department of Mechanical Engineering and Material Science, University of Pittsburgh, Pittsburgh, USA

    Patrick Smolinski & Freddie H. Fu

Authors
  1. Kenan Keklikci
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  2. Can Yapici
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  3. Donghwi Kim
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  4. Monica Linde-Rosen
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  5. Patrick Smolinski
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  6. Freddie H. Fu
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Correspondence to Freddie H. Fu.

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Keklikci, K., Yapici, C., Kim, D. et al. The effect of notchplasty in anterior cruciate ligament reconstruction: a biomechanical study in the porcine knee. Knee Surg Sports Traumatol Arthrosc 21, 1915–1921 (2013). https://doi.org/10.1007/s00167-012-2343-5

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  • DOI: https://doi.org/10.1007/s00167-012-2343-5

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