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Relationship between quadriceps femoris muscle volume and muscle torque after anterior cruciate ligament rupture

  • Yu KonishiEmail author
  • Toshiaki Oda
  • Satoshi Tsukazaki
  • Ryuta Kinugasa
  • Norikazu Hirose
  • Toru Fukubayashi
Knee

Abstract

Purpose

The purpose of this study was to obtain evidence to support the hypothesis that motor unit recruitment is reduced in the quadriceps femoris (QF) of patients with ACL rupture.

Methods

We compared muscle torque per unit volume in the QF from injured and uninjured sides to normal subjects. If high-threshold motor unit recruitment is reduced in patients with ACL rupture, this reduction will theoretically lead to a reduction in muscle torque per unit volume compared to the control group. The subjects included 22 patients with ACL rupture and 22 subjects with no history of knee injury. To identify the muscle torque per unit volume, the isokinetic peak torque was divided by QF volume which was obtained by MRI.

Results

Tests revealed that the mean muscle torque per unit volume of the uninjured and injured sides was significantly lower than those of the control group.

Conclusion

This study demonstrated that the values of the muscle torque per unit volume of both injured and uninjured sides of patients with ACL rupture were significantly lower than those of the control group, thereby providing indirect evidence of the hindrance of motor unit recruitment in these patients. The results of the present study also indicate that there may be bilateral QF weakness in patients with ACL rupture. Since persistent QF weakness is a significant barrier to effective rehabilitation in patients with ACL injuries, a better understanding of the underlying mechanisms will allow clinicians and scientists to develop more effective therapeutic strategies for patient rehabilitation.

Keywords

Muscle volume Torque Anterior cruciate ligament rupture Quadriceps femoris weakness 

Notes

Acknowledgments

This project was supported by a research grant from the Yamaha Motor Foundation for Sports. The authors would also acknowledge Mr. Kasai, Mr. Ootaki, Mr. Igarashi, Mr. Taguchi, and Mr. Kasuga who are the stuffs of radiological department at Japan Self Defense Force Yokosuka Hospital for their invaluable technical and lab assistance.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Yu Konishi
    • 1
    Email author
  • Toshiaki Oda
    • 2
  • Satoshi Tsukazaki
    • 3
  • Ryuta Kinugasa
    • 4
  • Norikazu Hirose
    • 4
  • Toru Fukubayashi
    • 4
  1. 1.Department of Physical EducationNational Defence AcademyYokosuka CityJapan
  2. 2.Living Matter Simulation Research Team, RIKENSaitamaJapan
  3. 3.Department of Orthopedic SurgeryJapan Self Defense Force Yokosuka HospitalKanagawaJapan
  4. 4.Department of Sports ScicneWaseda UniversityTokyoJapan

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