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Causes of absent tendon reflexes:

Tendon reflex may be absent in the following situations
  • Lower motor neurone disease
  • Neuronal shock
  • Marked spasticity and muscle contracture
  • Normal individuals unable to relax
It is  seen in lower motor neuron lesions involving  any part of the reflex arc
  • Lesion of the sensory nerve (polyneuritis)
  • Lesion of the sensory root (tabes dorsalis)
  • Lesion of the anterior horn cell (poliomyelitis)
  • Lesion of the anterior root (compression)
  • Lesion of the peripheral motor nerve (trauma, polyneuritis).
Before labelling as absent reflex do reinforcement