<s>[INST] Hi, I am 16 years old. I hurt my knee 3 weeks ago playing soccer and the doctor just said it was a small sprain. It still hurts today and I feel like my knee is going to give out while walking up and down steps. It also hurts when I stand up or when I m bending my knee while laying down. It s my right knee in the central left side of the knee. any idea what this could be? [/INST] Hi, You have an internal injury of the knee caused by a twist injury while playing soccer. In addition to the ligament on the sides of the knee, there are cartilaginous discs inside called menisci and a ligament which connects the two bones of the knee. As you are having a giving way of the knee, its possible you have an injury of this main ligament. An MRI is necessary to study the internal aspects of the knee and physical exam of the knee. Hope I have answered your question. Let me know if I can assist you further.  </s>