Final answer:
When the kneecap moves away from the center, it is called lateral patellar dislocation. This can cause pain and difficulty in moving the knee.
Step-by-step explanation:
When the kneecap moves away from the center, it is called lateral patellar dislocation. This occurs when the patella (kneecap) slides out of its normal position on the groove of the femur (thigh bone). It can cause pain, swelling, and difficulty in moving the knee.