In people younger than 50, knee cartilage damage usually occurs after an injury, such as twisting your knee, smashing your kneecap, or fracturing your knee. In people over 50, cartilage may wear down ...

Patellofemoral stress syndrome (PFSS), also known as "runner's knee ... at home, but those that are severe, recurrent, or interfere with your ability to play sports may require treatment by ...

Knee pain that is a result of chronic injury or repetitive stress on the joint may start as mild pain that does not impact your ability to continue playing sports or participating in daily tasks.