What causes no knee reflex?
What causes no knee reflex?
Damage to the brain or spinal cord can produce very brisk reflexes in the affected limb, whilst damage to a peripheral nerve produces dimished or absent reflexes.
What causes reflexes to be absent?
Peripheral neuropathy is today the most common cause of absent reflexes. The causes include diseases such as diabetes, alcoholism, amyloidosis, uremia; vitamin deficiencies such as pellagra, beriberi, pernicious anemia; remote cancer; toxins including lead, arsenic, isoniazid, vincristine, diphenylhydantoin.
What does absent reflexes indicate?
When reflex responses are absent this could be a clue that the spinal cord, nerve root, peripheral nerve, or muscle has been damaged. When reflex response is abnormal, it may be due to the disruption of the sensory (feeling) or motor (movement) nerves or both.
What if patellar reflex is absent?
An absent or diminished patellar tendon reflex may be due to PNS pathology affecting either the afferent sensory neurons or the efferent motor neurons. If the reflex is absent or diminished combined with sensory loss, the lesion is likely in the afferent sensory nerves.
What does it mean if you have no reflexes?
When reflex responses are absent this could be a clue that the spinal cord, nerve root, peripheral nerve, or muscle has been damaged. When reflex response is abnormal, it may be due to the disruption of the sensory (feeling) or motor (movement) nerves or both. Subsequently, one may also ask, what causes absent reflexes?
What causes no reflexes in legs?
or higher: significant hyper reflexivity; clonus is likely
What does it mean when your reflexes do not work?
Zero reflex means… drum roll… that there is no connection to the brain. It’s what the neurologists call a ‘no-brainer!’ The neurologist raps on your knee with a little hammer, and the nerves send that signal back to the spine, which goes to the brain. The brain sends a signal back down to move the leg.
What does absent reflexes mean?
A decreased or absent reflex may mean that there is compression in the S1 region. What causes loss of reflexes? Diabetes induced peripheral neuropathy (the most common sensory neuropathy seen in developed countries), for example, is a relatively common reason for loss of reflexes.