MRI few yrs back revealed lg ganglian cyst within R knee, asymptomatic. 3 days ago kneeling on floor heard deep POP within R knee, could it have ruptured? No pain unless try to kneel or sit with legs tucked under on floor. No redness, swelling observed. Knee feels very loose & posterior has tightness when standing from sitting & when bending over to touch toes.
Cyst are usually found at posterior part of knee. When polities muscle tendon moves over cyst it causes sudden pop. Rupture of cysts are usually very painful, which is not in this case. Hamstring stretch and static qua Chat Doctor.  Hope this helps. Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.