Progressive adaptation of whole-limb kinematics after peripheral nerve injury

Young Hui Chang, Stephen N. Housley, Kerry S. Hart, Paul Nardelli, Richard T. Nichols, Huub Maas, Timothy C. Cope*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The ability to recover purposeful movement soon after debilitating neuromuscular injury is essential to animal survival. Various neural and mechanical mechanisms exist to preserve whole-limb kinematics despite exhibiting long-term deficits of individual joints following peripheral nerve injury. However, it is unclear whether functionally relevant whole-limb movement is acutely conserved following injury. Therefore, the objective of this longitudinal study of the injury response from four individual cats was to test the hypothesis that whole-limb length is conserved following localized nerve injury of ankle extensors in cats with intact nervous systems. The primary finding of our study was that whole-limb kinematics during walking was not immediately preserved following peripheral nerve injuries that paralyzed subsets of ankle extensor muscles. Instead, whole-limb kinematics recovered gradually over multiple weeks, despite having the mechanical capacity of injury-spared muscles across all joints to achieve immediate functional recovery. The time taken to achieve complete recovery of whole-limb kinematics is consistent with an underlying process that relies on neuromuscular adaptation. Importantly, the gradual recovery of ankle joint kinematics remained incomplete, discontinuing once whole-limb kinematics had fully recovered. These findings support the hypothesis that a whole-limb representation of healthy limb function guides a locomotor compensation strategy after neuromuscular injury that arrests progressive changes in the joint kinematics once whole-limb kinematics is regained.

Original languageEnglish
Article numberbio028852
Pages (from-to)1-8
Number of pages8
JournalBiology open
Volume7
Issue number8
DOIs
Publication statusPublished - 6 Aug 2018

Keywords

  • Functional recovery
  • Locomotor compensation
  • Muscle paralysis

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