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Related Experiment Videos

Biomechanical changes at the ankle joint after stroke.

A F Thilmann1, S J Fellows, H F Ross

  • 1Neurologische Klinik, Alfried Krupp Krankenhaus, Essen, Germany.

Journal of Neurology, Neurosurgery, and Psychiatry
|February 1, 1991
PubMed
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Stroke patients with hemiparesis experience increased ankle stiffness, particularly in dorsiflexion on the affected side. This altered biomechanical property, mainly due to reduced Achilles tendon compliance, impacts their locomotion.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Rehabilitation Medicine

Background:

  • Stroke survivors often exhibit motor impairments, including spasticity and altered joint mechanics.
  • Ankle spasticity in hemiparetic stroke patients can significantly affect gait and mobility.
  • Understanding the passive biomechanical properties of the ankle is crucial for developing effective interventions.

Purpose of the Study:

  • To quantify the passive biomechanical properties of the ankle joint in hemiparetic stroke patients.
  • To compare ankle stiffness between the affected and unaffected sides in hemiparetic patients and with healthy controls.
  • To identify the underlying causes of altered ankle biomechanics in chronic hemiparesis.

Main Methods:

  • Measurement of ankle resistance to slow displacement across the full range of motion.

Related Experiment Videos

  • Inclusion of hemiparetic patients with established spasticity (≥1 year) and no contractures.
  • Comparison with age-matched healthy subjects.

    • Main Results:

    • Hemiparetic patients showed normal ankle flexibility on the unaffected side.
    • Significantly increased stiffness in dorsiflexion was observed on the affected (contralateral) side.
    • No significant changes in stiffness were noted during plantarflexion or in the neutral range.

    Conclusions:

    • Chronic hemiparetic stroke leads to significant changes in passive ankle biomechanical properties.
    • Reduced compliance of the Achilles tendon is the primary contributor to increased ankle stiffness.
    • Increased passive stiffness of the triceps surae muscles may also play a role.
    • These biomechanical alterations likely contribute to the locomotor disability observed in hemiparetic patients.