When the kneecap slips out of the groove, problems and knee pain can often result. In a normal knee, the kneecap fits nicely in the groove. If the groove is uneven or too shallow, the kneecap could ...

pain behind the knee, pain on the inside or outside of the knee, or pain on the front of the knee. Knee pain that is a result of chronic injury or repetitive stress on the joint may start as mild pain ...