<unk>  is the clinical correlate of the absence or decrease of patellar reflex or knee jerk. Patellar reflex or knee jerk is a kind of deep or stretch reflex where an application of a stimulus to the patellar tendon such as strike by a solid object or hammer caused the leg to extend due to such stimulus causes the quadriceps femoris muscle to contract. It is named for Carl Friedrich Otto<unk>  (1833-1890). __TOC__
Westphal's sign
Adson's sign
Dance's sign
Peabody's sign
Fothergill's sign
Joffroy's sign
Litten's sign
Litten's sign 