<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 stretch.
Westphal's sign
Adson's sign
Hegar's sign
Pemberton's sign
Rigler's sign
Kussmaul's sign
Goodell's sign
Beevor's sign