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Bicruciate lesion biomechanics, Part 1—Diagnosis: translations over 15 mm at 90° of knee flexion are indicative of a complete tear

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

Abstract

Purpose

Understanding the pathomechanics of a bicruciate injury (BI) is critical for its correct diagnosis and treatment. The purpose of this biomechanical study aims to quantify the effects of sequential sectioning of the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) bundles on knee laxity.

Methods

Twelve cadaveric knees (six matched pairs) were used. Knee laxity measurements consisted of neutral tibial position, anterior–posterior translation, internal–external rotation, and varus–valgus angulation in different conditions: intact, ACL cut, incomplete BI (divided into two groups: anterolateral (AL) bundle intact or posteromedial (PM) bundle intact) and complete bicruciate tear. Data were collected using a Microscribe system at 0°, 30°, 60°, and 90° of knee flexion.

Results

In comparison to the intact knees, incomplete BI and complete BI showed a significant increase of total antero-posterior tibial translation. The largest significant increase was observed at 90° of flexion after a complete bicruciate resection (p < 0.001). A threshold difference greater than 15 mm from the intact could be used to identify a complete BI from an incomplete BI evaluating the total antero-posterior translation at 90°. All sectioned states had significant increases compared with the intact condition in internal–external rotation and varus–valgus stability at all tested flexion angles.

Conclusion

Both incomplete and complete BI led to an important AP translation instability at all angles; however, full extension was the most stable position at all injured models. Total antero-posterior translation at 90° of knee flexion over 15 mm, in comparison to the intact condition, was indicative of a complete BI. Since the appropriate assessment of a combined ACL and PCL lesion remains a challenge, this study intends to assist its diagnosis. As BI’s main antero-posterior instability occurred at 90°, a total antero-posterior drawer test is proposed to evaluate BI in the clinical setting. Total antero-posterior translation at 90° > 15 mm, in comparison to the intact condition or the contra-lateral non-injured knee, can be used to identify a complete from an incomplete BI.

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Acknowledgements

This study was financially supported by São Paulo Research Foundation (FAPESP) grant number 2015/10317-7. Franciozi CE received post-doctoral scholarship from FAPESP supporting his scientific activities at the University of Southern California during 2015–2016, grant number 2015/08952-6. Carvalho RT received financial support from FAPESP while performing his Ph.D. activities at University of Southern California during 2016. The authors would like to thank Arthrex for the surgical instruments and material supply, and FAPESP for the financial support. The human cadaveric specimens were obtained through the University of California, Irvine Willed Body Program. Also, the authors would like to thank Andrea Moon, Felipe Huizar, Mike Shroder, Roseli Paschoa, and Leonardo A. Ramos. Without the help, support, orientation and enthusiasm of all aforementioned people, this work would not be possible.

Funding

This study was funded by São Paulo Research Foundation (FAPESP) grant number 2015/10317-7. Franciozi CE received post-doctoral scholarship from FAPESP supporting his scientific activities at the University of Southern California during 2015-2016, grant number 2015/08952-6. Carvalho RT received financial support from FAPESP while performing his Ph.D. activities at University of Southern California during 2016.

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Correspondence to Carlos Eduardo Franciozi.

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Conflict of interest

Carlos Eduardo Franciozi and Rene Jorge Abdalla received fees for speaking or for organizing an educational program and fee for consulting from Smith & Nephew in the past five years, not related to this study. James Eugene Tibone acts as a consultant for Arthrex but do not receive any money from them, not any related to this study. The remaining authors declare no conflict of interest.

Ethical approval

All procedures performed in this study were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments. This study was approved by The Federal University of São Paulo—UNIFESP—Institutional Review Board, number of Ethical Committee Approval: 45827413.5.0000.5505.

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de Carvalho, R.T., Franciozi, C.E., Itami, Y. et al. Bicruciate lesion biomechanics, Part 1—Diagnosis: translations over 15 mm at 90° of knee flexion are indicative of a complete tear. Knee Surg Sports Traumatol Arthrosc 27, 2927–2935 (2019). https://doi.org/10.1007/s00167-018-5011-6

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