Article

This cross-sectional investigation evaluates the reliability of estimating
medial gastrocnemius anatomical cross-sectional area (aCSA) in typically
developing and spastic cerebral palsy (SCP) cohorts. It verifies whether muscle
volume estimations based on aCSA improve when aCSA is multiplied by muscle-tendon
unit (MTU) or muscle length,
and whether the resulting errors in volume
estimations are smaller than changes after intervention. METHOD: Fifteen
typically developing children (mean age 8y 2mo [SD 1y 5mo], six males, nine
females) and 30 children with SCP (mean age 9y 2mo [SD 2y 5mo], 22 males, eight
females, Gross Motor Function Classification System [GMFCS] level I=15, II=15)
participated in the investigation. The SCP cohort was divided according to GMFCS
level. A three-dimensional freehand ultrasound technique was used to estimate
medial gastrocnemius aCSA, muscle volume, MTU, and muscle length. Estimated
muscle volume (aCSAxMTU or muscle length) was compared with the measured muscle
volume. RESULTS: Anatomical cross-sectional area, muscle volume, and muscle
length significantly differed between the typically developing and two SCP
cohorts (p</=0.050). aCSA multiplied by either MTU or muscle length improved
estimations of medial gastrocnemius volume. Leave-one-out cross-validation
revealed an absolute difference with measured muscle volume of 3.77 ml (SD 2.90).
INTERPRETATION: This investigation revealed that medial gastrocnemius muscle
volume can be reliably estimated in a clinically feasible manner in typically
developing children and those with SCP. WHAT THIS PAPER ADDS: Medial
gastrocnemius anatomical cross-sectional area (aCSA) can be reliably estimated in
children with spastic cerebral palsy. The location of the anatomical
cross-section should be taken with respect to muscle and not bone length. Medial
gastrocnemius volume can be reliably estimated by multiplying aCSA and muscle
length. The errors in volume estimations are smaller than reported differences
after interventions.
CI - (c) 2017 Mac Keith Press.
- Muscles jumeaux de la jambe

Langue : ANGLAIS