0-4: Deep tendon reflexes, of which the knee-jerk is the best known, are spinal reflexes triggered by hitting certain tendons. Triceps, biceps, patellar (knee) and ankle are the most commonly tested and are graded 0-4 as follows: 0-absent 1-small reaction 2=normal 3=brisk 4=clonic (continuous jerking) clinical context and symmetry more important than the actual reflex grade though.
Answered 12/23/2017
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