If you have dislocated your patella, there are several symptoms that you may experience. One of the most common symptoms is severe pain in your knee. The pain is usually sudden and may be intense, making it difficult to bear weight on the affected leg. You may also notice swelling and tenderness in the area around your kneecap. In addition to pain and swelling, you may also notice a visible deformity in your knee. Your kneecap may appear to be out of place or dislocated, which can be a sign of a serious injury. You may also notice that your leg looks different or feels different than your other leg, such as being shorter or misaligned. Another symptom of a dislocated patella is difficulty or inability to move your leg or bend your knee. You may find it challenging to straighten your leg, and your knee may feel stiff and immobile. In some cases, you may also experience numbness or tingling in your leg or foot due to nerve damage caused by the dislocation.