Whenever I do up and down while sitting with my knees and I touch my knee I feel a grinding of my knees. At times there is a little pain too. I think my legs are weak. And looking at my family history my mothers mother also had knee problem. And my mother faces the same problem to a greater extent though. Attached a picture where I get a grinding sensation in both legs. Is this a sign of future problem. Also I have pain whenever I sit on my knee. The pain is under my knee. Also there is pain when I apply pressure to that area. Attached second photo. Pls help