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Variability of tunnel positioning in ACL reconstruction

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

Abstract

Introduction

Since tunnel positioning is one of the key factors in anterior cruciate ligament (ACL) reconstruction and the variability of tunnel positioning in ACL reconstruction has so far never been analyzed, the objective of this study was to determine the inter- and intra-observer variability of tibial and femoral tunnel positioning in ACL reconstruction.

Materials and methods

In an operating room setup, 13 surgeons were asked to identify the tunnel positions in one and the same ACL-deficient cadaver knee. Using a fluoroscopic based ACL navigation system, tunnel positions were digitally measured in a test/re-test scenario. For variability analysis mean positions, standard deviations and range were calculated as well as differences between test/re-test positions.

Results

The intraobserver analysis showed a tibial variability of 3.3 mm (SD 2.1, range 7.5 mm) and a femoral variability of 2.0 mm (SD 1.6 mm, range 6.8 mm). The interobserver variability of the tibial tunnel positions was 3.2 mm (SD) with a range of 18.3 mm and a femoral variability of 3.7 mm (SD) with a range of 13.2 mm.

Conclusions

This study demonstrates that a reasonable inter- and intra-observer variability in ACL tunnel positioning exists even among experienced surgeons. Although deviations of 2–3 mm may seem to be acceptable at first sight, a range of up to 18.3 mm indicates that outliers exist, which can cause graft failure. More reliable reconstruction techniques should be developed to reduce the variability in tunnel positioning.

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Authors and Affiliations

  1. Department of Trauma and Orthopaedic Surgery, Cologne Merheim Medical Centre, Witten/Herdecke University, Ostmerheimer Strasse 200, 51109, Cologne, Germany

    Sven Shafizadeh, Maurice Balke & Marc Banerjee

  2. Department of Surgery, Hospital Cologne-Porz, Urbacherweg 19, 51149, Cologne, Germany

    Ulrich Hagn

  3. Orthopaedics and Sports Traumatology, Cologne Merheim Medical Centre, Ostmerheimer Strasse 200, 51109, Cologne, Germany

    Juergen Hoeher

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  1. Sven Shafizadeh
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  2. Maurice Balke
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Correspondence to Sven Shafizadeh.

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Shafizadeh, S., Balke, M., Hagn, U. et al. Variability of tunnel positioning in ACL reconstruction. Arch Orthop Trauma Surg 134, 1429–1436 (2014). https://doi.org/10.1007/s00402-014-2039-z

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  • DOI: https://doi.org/10.1007/s00402-014-2039-z

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