This video supports Clare Rusbridge's website pages on Wobbler's syndrome [ Ссылка ] and lectures at University of Surrey

Significance
A clonic patellar reflex is an abnormal, repetitive contraction of the quadriceps muscle after elicitation of the patellar reflex.
It is may be observed in dogs with upper motor neuron (UMN) lesions, such as those caused by cervical spinal cord compression in Wobbler Syndrome.
More likely with chronic spinal cord compression in Wobbler Syndrome.

Pathophysiology
The clonic reflex results from the loss of inhibitory signals from the brain or spinal cord due to a UMN lesion. This leads to:
Hyperreflexia: Exaggerated reflex responses.
Spasticity: Increased muscle tone in the pelvic limbs.
Seen where the spinal cord lesion is located cranial to the reflex arc.

Interpretation as a UMN Lesion
Increased Reflex Activity:
The clonic patellar reflex suggests disruption of UMN pathways in the cervical spinal cord.
UMN lesions prevent normal modulation of the reflex arc in the lumbosacral spinal cord.

Localisation:
Lesions in the C1- L3 spinal cord segments can present with UMN signs in the pelvic limbs, including a clonic patellar reflex.
UMN Lesion: Normal or Hyperreflexia, clonic reflexes, spastic paresis.
LMN Lesion: Hyporeflexia, muscle atrophy, flaccid paresis.
Localising neurological signs guides further diagnostic imaging (e.g., MRI) and therapeutic planning.

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