A kneecap dislocates in the event the triangular bone (patella) that covers the entrance of the knee slips outside of location, commonly to the skin within your knee. Occasionally it is possible to begin to see the dislocation under the skin. As 1 ages, the synovial fluid (lubricant) dries up. https://www.theorthopaedicandpainpractice.com/my-knee-hurts/