Why do Doctors Tap the Patella Tendon?

Answer

A doctor tapping you patella tendon is the knee jerk test or patellar reflex test. This is actually a part of your clinical neurologic exam You can find more information here: www.medterms.com
Reference:
1 Additional Answer
The doctors tap the patella tendon to test the reflexes of the tendon. It is always good to have your leg 'jerk' slightly. When there is not a reflex, it could be indicative of a nerve problem.
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