why are the muscles around my knee tight
Found This Helpful. Jupiterimages/liquidlibrary/Getty Images. Your knees are the largest, heaviest, hinge joints in your body. Because so many muscles of the upper leg are inserted into this joint, a multitude of factors can cause pain and tightness around the knee.ound This Helpful. Jupiterimages/liquidlibrary/Getty Images. Your knees are the largest, heaviest, hinge joints in your body. Because so many muscles of the upper leg are inserted into this joint, a multitude of factors can cause pain and tightness around the knee.