31 year old avid male competitive runner. Overall good health, no major mechanical issues.
Right, backside of left knee "pops" much like knuckles intermittently. General area is where the ligament can be felt when knee is flexed.
Can not be produced on demand, just all of the sudden happens.
Does not happen while walking, climbing stairs or even exercising on elliptical machine, only when running.
Does not produce pain just annoyance that halts the running.
Started as every now only when running. Progressed to now occurring within first 1/2 mile and continues.
Stopped all running activity 3 weeks ago to try and resolve. Tried again yesterday and it happened within