MRI---all ligaments etc...are good. Had no problems with my knee until this fall in early January. I fell directly on my knee, tore pants and the skin off my knee. About 8 hours after the fall I went to do a complete squat (to the floor) and it took my breath away. I have difficulty kneeling on it and squatting and getting back up. Bending knee to put pants on is not comfortable.
MRI says "minor superficial fissuring of the articular cartilage over both patella facet and depths of the trochlear groove is appreciated".
Doctor says it is osteoarthritis.