I’m female, aged 34 and do aerobics 5 -6 times a weeK, split between cardio and conditioning exercises.Over the last week my right knee has started to make crackling sounds (definitely not a click -more like a paper crunching up type noise) when I do deep squats that work the inner thigh. There is no sharp pain but my knee feels slightly sore and a bit unstable. If I thought it was safe to go on exercising without damaging it, the noise doesn’t really bother me but I’m not sure if I should rest it totally. I stopped doing the squats but it now feels a bit sore during low impact aerobics. Many of the knee-related web sites seem to suggest that if there isn’t any pain or swelling, then it’s OK to keep going. Anyone have any ideas?