In vivo evaluations of morphologic changes of gastrocnemius muscle fascicles and Achilles tendon in children with cerebral palsy

Fan Gao, Heng Zhao, Deborah J Gaebler-Spira, Li Qun Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Objective: The Achilles tendon plays an important role in soleus and gastrocnemius muscle functions, including proper muscle force transmission and movement generation. However, few studies have examined concurrent changes of tendon and muscle properties in neurologic disorders. The objective of this study was to investigate the morphologic characteristics of both the calf muscle fascicles and the Achilles tendon in children with cerebral palsy (CP). Design: A cross-sectional study was planned, and 12 children with CP and 11 typically developing children participated in this study. For both groups, B-mode ultrasonography was used to evaluate the architecture of the medial gastrocnemius muscle, including fascicle length and pennation angle at various ankle (20, 10, and 0 degrees plantar flexion and 10 degrees dorsiflexion) and knee (full extension and 90 degrees flexion) positions. The length and cross-sectional area of the Achilles tendon were also evaluated using ultrasonography. Results: For both CP and control groups, muscle fascicle length, pennation angle, and Achilles tendon length and cross-sectional area varied with ankle and knee positions systematically. Compared with controls, children with CP had shorter muscle fascicles across the tested ankle range of motion (P ≤ 0.003), longer Achilles tendon (P = 0.001), and smaller cross-sectional area of the Achilles tendon (P = 0.003). Conclusions: The changes in Achilles tendon properties could be a result of adaptation to calf muscle fascicle shortening and stiffening, which may affect performance of the muscles. A better understanding of the interactions between calf muscle fascicles and Achilles tendon in children with CP may help treat the pathologic changes more effectively.

Original languageEnglish (US)
Pages (from-to)364-371
Number of pages8
JournalAmerican Journal of Physical Medicine and Rehabilitation
Volume90
Issue number5
DOIs
StatePublished - May 1 2011

Keywords

  • Achilles Tendon
  • Cerebral Palsy
  • Children
  • Muscle Fascicle
  • Ultrasonography

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation

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