TY  - BOOK
AU  - Berrigan, William A
AU  - Farrell, Michael
TI  - Hip position influences shear wave elastography measurements of the hamstring muscles in healthy subjects
SN  - 0021-9290
PY  - 2020///
KW  - IN PROCESS -- NOT YET INDEXED
KW  - MedStar National Rehabilitation Network
KW  - Journal Article
N2  - Ultrasound shear wave elastography (SWE) has recently emerged as a non-invasive tool for assessing muscle stiffness. The majority of studies utilizing SWE have focused primarily on upper-extremity muscles, with little attention attributed to lower-extremity muscles. In addition, of the studies that have been published, various joint and muscle positions have been examined, rendering it difficult to compare results across studies. Thus, the purpose of this investigation was to examine lower extremity medial hamstring muscles (semitendinosus and semimembranosus) and to determine how hip position (0degree versus 90degree) and muscle position (knee flexed versus extended) impacted resulting shear modulus values. Ten subjects varying widely in age participated in this study, and their hamstring stiffness was assessed in four separate positions: seated with the knee flexed and extended, and lying prone with the knee flexed and extended. Higher shear modulus values were found at the group-level when participants were seated compared to prone (hip placed at 90degree compared to 0degree). In addition, higher values were also found when the knee was extended compared to flexed, but only when the hip was placed at 90degree (not 0degree). These results demonstrate that joint and muscle position, particularly when assessing the hamstrings, largely impact resulting shear modulus values. Therefore, joint and muscle position need to be systematically controlled for and reported when establishing normative ranges for shear modulus values across specific age groups. This will enable physicians to more precisely determine whether patients' shear modulus values indicate clinically meaningful differences in comparison to normative data. Copyright Published by Elsevier Ltd
UR  - https://dx.doi.org/10.1016/j.jbiomech.2020.109930
ER  -