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Restriction in hip internal rotation is associated with an increased risk of ACL injury

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

Abstract

Purpose

Evidence suggests that femoroacetabular impingement (FAI) in athletes may increase the risk of anterior cruciate ligament (ACL) injury. This study correlates ACL injury with hip range of motion in a consecutive series of elite, contact athletes and tests the hypothesis that a restriction in the available hip axial rotation in a dynamic in silico model of a simulated pivot landing would increase ACL strain and the risk of ACL rupture.

Methods

Three hundred and twenty-four football athletes attending the 2012 NFL National Invitational Camp were examined. Hip range of internal rotation was measured and correlated with a history of ACL injury and surgical repair. An in silico biomechanical model was used to study the effect of FAI on the peak relative ACL strain developed during a simulated pivot landing.

Results

The in vivo results demonstrated that a reduction in internal rotation of the left hip was associated with a statistically significant increased odds of ACL injury in the ipsilateral or contralateral knee (OR 0.95, p = 0.0001 and p < 0.0001, respectively). A post-estimation calculation of odds ratio for ACL injury based on deficiency in hip internal rotation demonstrated that a 30-degree reduction in left hip internal rotation was associated with 4.06 and 5.29 times greater odds of ACL injury in the ipsilateral and contralateral limbs, respectively. The in silico model demonstrated that FAI systematically increased the peak ACL strain predicted during the pivot landing.

Conclusion

FAI may be associated with ACL injury because of the increased resistance to femoral internal axial rotation during a dynamic maneuver such as a pivot landing. This insight may lead to better interventions to prevent ACL injury and improved understanding of ACL reconstruction failure.

Level of evidence

Cohort study, Level IV.

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Authors and Affiliations

  1. MedSport, Department of Orthopaedic Surgery, University of Michigan, 24 Frank Lloyd Wright Drive, Lobby A, Ann Arbor, MI, 48106, USA

    Asheesh Bedi, Edward M. Wojtys & Hanna Oltean

  2. Orthopaedic Surgery, Hospital for Special Surgery, New York, NY, 10021, USA

    Russell F. Warren & Bryan T. Kelly

  3. Departments of Mechanical and Biomedical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    You Keun Oh & James A. Ashton-Miller

Authors
  1. Asheesh Bedi
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  2. Russell F. Warren
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  3. Edward M. Wojtys
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  4. You Keun Oh
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  5. James A. Ashton-Miller
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  6. Hanna Oltean
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  7. Bryan T. Kelly
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Correspondence to Asheesh Bedi.

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Cite this article

Bedi, A., Warren, R.F., Wojtys, E.M. et al. Restriction in hip internal rotation is associated with an increased risk of ACL injury. Knee Surg Sports Traumatol Arthrosc 24, 2024–2031 (2016). https://doi.org/10.1007/s00167-014-3299-4

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  • DOI: https://doi.org/10.1007/s00167-014-3299-4

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