A patellar dislocation is another commonplace injury that involves the patella (aka the 'knee cap'.) The patella is situated in the patellofemoral cavity between the distal femur and the tibia, held in place by a number of ligaments and tendons. These ligaments can be damaged by a direct blow to the knee or an awkward motion, which in turn can lead to the knee cap sliding out of place. Most of these dislocations involve the patella moving laterally to the left or right side. The result is severe swelling, reduced mobility and an intense pain felt inside of the knee cap.