question: 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.