Last year I worked in a retial store. My duties included unloading trucks, lifting up to 80 pounds, pulling pallets of merchandise stacked up to 7 feet, and several hours of kneeling per night. I began to have pain in my knee and thought I had sprained it. However, a year later, the symptoms are still present, and become worse with increased standing, kneeling, or bending. Just under the right knee cap swells dramatically, and is "squishy" like fluid. It becomes extremely painful.