Yesterday I twisted my leg and I felt my knee

Patient: Yesterday I twisted my leg and I felt my knee pop. It hurt but it was bearable pain. When I woke up today it hurt a lot and I can bend my knee or keep it straight and it hurts to walk on it. What’s wrong with it? I did the exact same thing to my other knee just last week. Do I have weak knee? I’m only 16

Symptoms: Knee pain

Doctor: