I have an old injury on my left knee between the knee cap and the leg bone. I fell on edge of concrete and landed full force . my knee swelled and the blood bruise went down my leg and thru the left foot and it could be seen on the bottom of my foot. The dr I saw said the xray indicated a severe injury but not necessary for surgery. Told me that when it became painful to climb stairs/slopes then I should see a dr and see about surgery. I have injured it twice and this time I was just walking down my hallway and my leg gave way and my knee went backwards and I gingerly limped to chair . this was a week before thankgiving and it is still giving me severe pain and the swelling in my foot almost goes down then it swells up again. the most pain is on the back of knee on the right inside joint. Could I have broken cart ledge or tore a muscle?