A 16-year-old female presents with a primary complaint of a loud popping sound when she flexes her knee.

If chronic overuse persists in an athlete, the patella tendon can undergo degenerative changes. These changes can lead to tendinosis

19-year-old male track athlete reports having right knee pain for 3 years. He cannot recall any traumatic injury to the knee.

A discoid meniscus is an abnormally shaped meniscus which can cause popping and catching or be present with no symptoms at all.