text: knee problems? ok today as i stood up i noticed something like popped in my knee... im 13 years old... its hurts to bend my knee such as sitting and squating... im a athelete too and i want to kno wat is wrong with my knee or if any of you have had this it's possible that you might have injured it. it doesn't take much to injure a joint, especially a knee or ankle, because those joints hold up your body weight and take alot of pressure. it could also be growing pains. if you have had or are about to have, a growth spurt, your joints will hurt, especially your knees. if it continues to hurt, you need to talk to your parents and see a doctor.