A kneecap dislocates if the triangular bone (patella) that addresses the front of your knee slips out of place, regularly to the outside of one's knee. Sometimes you could begin to see the dislocation beneath the skin. As a person ages, the synovial fluid (lubricant) dries up. This improves friction https://www.theorthopaedicandpainpractice.com/my-knee-hurts/