Skip to main content

Dynamic restraint capacity of the hamstring muscles has important functional implications after anterior cruciate ligament injury and anterior cruciate ligament reconstruction

Journal Article


Abstract


  • Objective

    The purpose of this study was to investigate the relation between knee functionality of anterior cruciate ligament deficient (ACLD) and anterior cruciate ligament reconstruction (ACLR) patients and hamstring antagonist torque generated during resisted knee extension.

    Design

    Cross-sectional.

    Setting

    Laboratory based.

    Participants

    Male ACLD subjects (n=10) (1835y) and 27 matched males who had undergone ACLR (14 patella tendon [PT] grafts and 13 combined semitendinosus/gracilis tendon grafts).

    Interventions

    Not applicable.

    Main Outcome Measures

    Knee functionality was rated (0- to 100-point scale) by using the Cincinnati Knee Rating System. Using electromyography data from the semitendinosus (ST) and biceps femoris muscles, we created a mathematical model to estimate the opposing torque generated by the hamstrings during isokinetic knee extension in 10° intervals from 80° to 10° knee flexion.

    Results

    Pearson product-moment correlations revealed that more functional ACLD subjects generated significantly (P<.05) higher hamstring antagonist torque throughout knee extension. In contrast, more functional PT subjects produced significantly lower hamstring antagonist torque at 80° to 70° knee flexion, whereas no significant associations were found between hamstring antagonist torque and knee functionality for the ST/gracilis tendon subjects.

    Conclusions

    An increased hamstring antagonist torque generated by the more functional ACLD subjects, reflective of increased hamstring contractile force, is thought to represent a protective mechanism to compensate for mechanical instability. The restoration of anterior knee stability through ACLR negates the need for augmented hamstring antagonist torque.

Authors


  •   Bryant, Adam (external author)
  •   Creaby, M (external author)
  •   Newton, Robert U. (external author)
  •   Steele, Julie R.

Publication Date


  • 2008

Citation


  • Bryant, A., Creaby, M., Newton, R. & Steele, J. R. (2008). Dynamic restraint capacity of the hamstring muscles has important functional implications after anterior cruciate ligament injury and anterior cruciate ligament reconstruction. Archives of Physical Medicine and Rehabilitation, 89 (12), 2324-2331.

Scopus Eid


  • 2-s2.0-56849128767

Ro Metadata Url


  • http://ro.uow.edu.au/hbspapers/1664

Number Of Pages


  • 7

Start Page


  • 2324

End Page


  • 2331

Volume


  • 89

Issue


  • 12

Place Of Publication


  • http://www.sciencedirect.com/science/journal/00039993

Abstract


  • Objective

    The purpose of this study was to investigate the relation between knee functionality of anterior cruciate ligament deficient (ACLD) and anterior cruciate ligament reconstruction (ACLR) patients and hamstring antagonist torque generated during resisted knee extension.

    Design

    Cross-sectional.

    Setting

    Laboratory based.

    Participants

    Male ACLD subjects (n=10) (1835y) and 27 matched males who had undergone ACLR (14 patella tendon [PT] grafts and 13 combined semitendinosus/gracilis tendon grafts).

    Interventions

    Not applicable.

    Main Outcome Measures

    Knee functionality was rated (0- to 100-point scale) by using the Cincinnati Knee Rating System. Using electromyography data from the semitendinosus (ST) and biceps femoris muscles, we created a mathematical model to estimate the opposing torque generated by the hamstrings during isokinetic knee extension in 10° intervals from 80° to 10° knee flexion.

    Results

    Pearson product-moment correlations revealed that more functional ACLD subjects generated significantly (P<.05) higher hamstring antagonist torque throughout knee extension. In contrast, more functional PT subjects produced significantly lower hamstring antagonist torque at 80° to 70° knee flexion, whereas no significant associations were found between hamstring antagonist torque and knee functionality for the ST/gracilis tendon subjects.

    Conclusions

    An increased hamstring antagonist torque generated by the more functional ACLD subjects, reflective of increased hamstring contractile force, is thought to represent a protective mechanism to compensate for mechanical instability. The restoration of anterior knee stability through ACLR negates the need for augmented hamstring antagonist torque.

Authors


  •   Bryant, Adam (external author)
  •   Creaby, M (external author)
  •   Newton, Robert U. (external author)
  •   Steele, Julie R.

Publication Date


  • 2008

Citation


  • Bryant, A., Creaby, M., Newton, R. & Steele, J. R. (2008). Dynamic restraint capacity of the hamstring muscles has important functional implications after anterior cruciate ligament injury and anterior cruciate ligament reconstruction. Archives of Physical Medicine and Rehabilitation, 89 (12), 2324-2331.

Scopus Eid


  • 2-s2.0-56849128767

Ro Metadata Url


  • http://ro.uow.edu.au/hbspapers/1664

Number Of Pages


  • 7

Start Page


  • 2324

End Page


  • 2331

Volume


  • 89

Issue


  • 12

Place Of Publication


  • http://www.sciencedirect.com/science/journal/00039993