Validity of fascicle length estimation in the vastus lateralis and vastus intermedius using ultrasonography.
The purpose of this study was to determine the validity of fascicle length estimation in the vastus lateralis (VL) and vastus intermedius (VI) using ultrasonography. The fascicle lengths of the VL and VI muscles were measured directly (dFL) using calipers, and were estimated (estmFL) using ultrasonography, in 10 legs from five Thiel's embalmed cadavers. To determine the validity of the estmFLs, FL was estimated using five previously published models and compared with dFL. The intraclass correlation coefficients (ICCs) of two of the five models were>0.75, indicating that these estimates were valid. Both of these models combined measurement of the length of the visible part of the fascicle with linear extrapolation of the length of the part of the fascicle that was not visible on the sonographic image. The ICCs and absolute% difference were best in models that used appropriate pennation angles. These results suggest that two of the five previously published models are valid for obtaining estmFL of the VL and VI using ultrasonography.
Graduate School of Education and Human Development, Nagoya University, Japan. Electronic address: ando@nagoya-u.jp.
Ryosuke
R
Ando
School of Health Science, Sapporo Medical University, Japan.
Keigo
K
Taniguchi
Graduate School of Education and Human Development, Nagoya University, Japan; Japan Society for the Promotion of Science, Japan.
Akira
A
Saito
School of Medicine, Sapporo Medical University, Japan.
Mineko
M
Fujimiya
School of Health Science, Sapporo Medical University, Japan.
Masaki
M
Katayose
Graduate School of Education and Human Development, Nagoya University, Japan; Research Center of Health, Physical Fitness & Sports, Nagoya University, Japan. Electronic address: akima@nagoya-u.jp.
Hiroshi
H
Akima
D000368:Aged; D000369:Aged, 80 and over; D002102:Cadaver; D005260:Female; D006801:Humans; D007866:Leg / Q000000981:diagnostic imaging* / Q000502:physiology*; D008297:Male; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging* / Q000502:physiology*; D052097:Quadriceps Muscle; D015203:Reproducibility of Results; D014463:Ultrasonography
Cadaver; Fascicle length; Skeletal muscle; Ultrasonography; Vastus intermedius