TY - JOUR
T1 - Cocontraction measured with short-range stiffness was higher in obstetric brachial plexus lesions patients compared to healthy subjects
AU - Anguelova, Galia V.
AU - de Vlugt, Erwin
AU - Vardy, Alistair N.
AU - Van Zwet, Erik W.
AU - van Dijk, J. Gert
AU - Malessy, Martijn J.A.
AU - de Groot, Jurriaan H.
PY - 2017
Y1 - 2017
N2 - We suggest short range stiffness (SRS) at the elbow joint as an alternative diagnostic for EMG to assess cocontraction.Elbow SRS is compared between obstetric brachial plexus lesion (OBPL) patients and healthy subjects (cross-sectional study design). Seven controls (median 28. years) and five patients (median 31. years) isometrically flexed and extended the elbow at rest and three additional torques [2.1,. 4.3,. 6.4. N. m] while a fast stretch stimulus was applied. SRS was estimated in silico using a neuromechanical elbow model simulating the torque response from the imposed elbow angle.SRS was higher in patients (250. ±. 36. N. m/rad) than in controls (150. ±. 21. N. m/rad, p = 0.014), except for the rest condition. Higher elbow SRS suggested greater cocontraction in patients compared to controls. SRS is a promising mechanical alternative to assess cocontraction, which is a frequently encountered clinical problem in OBPL due to axonal misrouting.
AB - We suggest short range stiffness (SRS) at the elbow joint as an alternative diagnostic for EMG to assess cocontraction.Elbow SRS is compared between obstetric brachial plexus lesion (OBPL) patients and healthy subjects (cross-sectional study design). Seven controls (median 28. years) and five patients (median 31. years) isometrically flexed and extended the elbow at rest and three additional torques [2.1,. 4.3,. 6.4. N. m] while a fast stretch stimulus was applied. SRS was estimated in silico using a neuromechanical elbow model simulating the torque response from the imposed elbow angle.SRS was higher in patients (250. ±. 36. N. m/rad) than in controls (150. ±. 21. N. m/rad, p = 0.014), except for the rest condition. Higher elbow SRS suggested greater cocontraction in patients compared to controls. SRS is a promising mechanical alternative to assess cocontraction, which is a frequently encountered clinical problem in OBPL due to axonal misrouting.
KW - Activation ratio
KW - Erb's palsy
KW - Motor misrouting
KW - Obstetric brachial plexus lesion
KW - Short-range stiffness
UR - http://www.scopus.com/inward/record.url?scp=85028034795&partnerID=8YFLogxK
U2 - 10.1016/j.jbiomech.2017.08.015
DO - 10.1016/j.jbiomech.2017.08.015
M3 - Article
AN - SCOPUS:85028034795
SN - 0021-9290
VL - 63
SP - 192
EP - 196
JO - Journal of Biomechanics
JF - Journal of Biomechanics
ER -