I've been in 3 car wrecks since 3/2007.The1st wreck I had neck,back,& a torn medial meniscus.I had surgery to repair the knee & with physical therapy & excercise recovered with no permanent problems.In the 2nd wreck had the same neck,back,but only non-surgical damage to the same left knee.With physical therapy & exercise recovered with no permanent problems.in the 3rd wreck I have the same neck,back & knee problems,only this time,after my 3rd MRI which shows no tears or structural damage,I have constant pain in the left hip,a numb left foot that also feels extemely hot all the time,My knee swells at the drop of a hat,pops & locks on occasion,especially after sleeping all night,if I'm able to.Some times I'm awakened in the middle of the night w/knee pain when my knees bump together,even with a pillow between my legs.The knee swells when I walk, exercise,twist,bend,etc.When my knee locks up I'll heat up a moist towel in the microwave,wrap my knee until the pain goes away,then I'll straighten the leg & thats when it pops the worst.Any ideas or thoughts or similar experiences.I do have a follow up with my orthopod,but I kind of get the feeling that he's stumped too.