Iliocapsularis: technical application of fine-wire electromyography, and direction specific action during maximum voluntary isometric contractions

Lawrenson, Peter, Grimaldi, Alison, Crossley, Kay, Hodges, Paul, Vicenzino, Bill and Semciw, Adam Ivan (2017) Iliocapsularis: technical application of fine-wire electromyography, and direction specific action during maximum voluntary isometric contractions. Gait and Posture, 54 300-303. doi:10.1016/j.gaitpost.2017.03.027


Author Lawrenson, Peter
Grimaldi, Alison
Crossley, Kay
Hodges, Paul
Vicenzino, Bill
Semciw, Adam Ivan
Title Iliocapsularis: technical application of fine-wire electromyography, and direction specific action during maximum voluntary isometric contractions
Journal name Gait and Posture   Check publisher's open access policy
ISSN 1879-2219
0966-6362
Publication date 2017-05-01
Sub-type Article (original research)
DOI 10.1016/j.gaitpost.2017.03.027
Open Access Status Not yet assessed
Volume 54
Start page 300
End page 303
Total pages 4
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract The iliocapsularis muscle of the anterior hip may play an important role in hip function, but no electromyographic (EMG) recordings have been made. This muscle provides the most substantial muscular attachment to the anterior hip capsule and is hypothesised to have a dynamic role to limit capsular impingement and to augment joint stability. Current understanding of the function of iliocapsularis is based on limited cadaveric and radiographic studies. Located deep over the hip joint it would require intramuscular fine-wire EMG to evaluate its activity directly with limited cross-talk from overlying muscles. The primary aim of this study was to describe a new technique for insertion of intramuscular EMG electrodes into iliocapsularis and to report its activation during different directions of hip maximum voluntary isometric contraction (MVIC). Fifteen healthy volunteers (10 M, mean age (SD) 22 (2) years) who were free from hip pain were recruited for electrode insertion and to perform MVIC's in six directions at 0° and three directions at 90° of hip flexion. Intramuscular electrodes were successfully inserted into the iliocapsularis muscle with guidance from real-time ultrasound imaging. The greatest muscle activity occurred during resisted hip flexion at 90° (Median (IQR); 100.0 (1.2) % MVIC) and lowest activity during hip extension, 0° (0.5 (0.3) % MVIC). These findings have implications for our understanding of iliocapsularis’ functional role. This paper provides the first report of intramuscular electrode insertion into iliocapsularis with guided technical instructions for future EMG investigations in other populations and tasks.
Keyword Electromyography
Groin
Hip
Hip capsule
Intramuscular
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Health and Rehabilitation Sciences Publications
 
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