Thigh musculature stiffness during active muscle contraction after anterior cruciate ligament injury

April L. McPherson, Nathaniel A. Bates, Clifton R. Haider, Takashi Nagai, Timothy E. Hewett, Nathan D. Schilaty

Research output: Contribution to journalArticle

Abstract

Background: Altered motor unit (MU) activity has been identified after anterior cruciate ligament (ACL) injury, but its effect on muscle tissue properties is unknown. The purpose of this study was to compare thigh musculature muscle stiffness between control and ACL-injured subjects. Methods: Thirty ACL-injured subjects and 25 control subjects were recruited. Subjects completed a randomized protocol of isometric contractions while electromyography (EMG) signals were recorded. Three maximum voluntary isometric contractions (MVIC) determined peak force for 10 and 25% MVIC trials. Shear wave elastography was captured during each 10 and 25% MVIC trials. Results: Differences in muscle stiffness were assessed between limbs and groups. 12 months post-surgery had higher stiffness for VM 0% MVIC, VL 0 and 10% MVIC, and ST 10 and 25% MVIC (all p ≤ 0.04). Conclusion: Thigh musculature stiffness changed throughout rehabilitation and remained altered at 12 months after ACL reconstruction.

Original languageEnglish (US)
Article number320
JournalBMC Musculoskeletal Disorders
Volume21
Issue number1
DOIs
StatePublished - May 21 2020

Keywords

  • ACL reconstruction
  • Arthrogenic muscle inhibition
  • EMG decomposition
  • Rehabilitation
  • Shear wave elastography

ASJC Scopus subject areas

  • Rheumatology
  • Orthopedics and Sports Medicine

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