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The effect of bone tunnel dilation versus extraction drilling on the initial fixation strength of press-fit anterior cruciate ligament reconstruction

  • Arthroscopy and Sports Medicine
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Serial dilation of the bone tunnel has been reported to create a tighter graft-tunnel fit. It was hypothesized that a serial dilation of the femoral bone tunnel would increase the initial fixation strength in press-fit anterior cruciate ligament (ACL) reconstructive surgery.

Materials and methods

Initial fixation strength of the femoral press-fit fixation technique was investigated in 72 porcine specimens in an ex vivo study by varying the femoral tunnel preparation technique. Extraction-drilling, tunnel dilation by 1 mm and dilation by 2.5 mm were assessed. Initial fixation strength of press-fit fixated patellar tendon–bone grafts was tested within each preparation group conducting a single cycle (and cyclic) load to failure protocol. The resulting tunnel diameter and the porcine femoral bone mineral density were determined using microradiographs and peripheral quantitative CT scans, respectively.

Results

Dilating a previously extraction-drilled femoral bone tunnel by 1 mm significantly enhances initial press-fit fixation strength in both single cycle and cyclic load to failure testing when compared to extraction-drilling and tunnel dilation by 2.5 mm. Due to an initial spring-back effect the resulting diameter of the femoral tunnel was underestimated by 3.3% with drilling and 6.7 and 12.2% with dilation by 1 and 2.5 mm, respectively. Volumetric trabecular bone mineral density at the site corresponding to the area of tunnel placement averaged 318 mg/cm³.

Conclusion

Dilating a femoral tunnel that is underdrilled by 1 mm appears to be a reasonable technical procedure in order to enhance initial fixation strength of press-fit ACL graft fixation.

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Authors and Affiliations

  1. Institute for Biomechanics and Orthopedics, German Sport University Cologne, Carl-Diem Weg 6, 50933, Cologne, Germany

    Jens Dargel, Rüdiger Schmidt-Wiethoff & Gert-Peter Brüggemann

  2. Institute for Anatomy, University of Cologne, Joseph-Stelzmann Strasse 9, 50931, Cologne, Germany

    Jürgen Koebke

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  1. Jens Dargel
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  2. Rüdiger Schmidt-Wiethoff
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  3. Gert-Peter Brüggemann
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  4. Jürgen Koebke
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Correspondence to Jens Dargel.

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Dargel, J., Schmidt-Wiethoff, R., Brüggemann, GP. et al. The effect of bone tunnel dilation versus extraction drilling on the initial fixation strength of press-fit anterior cruciate ligament reconstruction. Arch Orthop Trauma Surg 127, 801–807 (2007). https://doi.org/10.1007/s00402-006-0206-6

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  • DOI: https://doi.org/10.1007/s00402-006-0206-6

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