Hi. I was involved in 2 head on collisions in an 8 month period. Both times I was in the front seat. My knees took most the impact. I had 2 months of physical therapy on them. Its now a year later and I m still experiencing pain in my knees. When I squat, even just slightly, I can hear and feel a loud crackling, squishy noise. The pain isn t extreme, but there is pain. Is there anything I can do to relieve this. I like to exercise and its stopping from doing so. Thanks.