<s>[INST] I was hiking down a trail and stepped off a small ledge with my right foot. My knee gave out because the step was higher than anticipated, I am experiencing sharp pain in the left front side of the knee when I walk. I m not sure if it s a joint or ligament. How should I treat the injury? I haven t applied anything to the site and have taken extra strength acetometophin last night and this morning. [/INST] Hello,I haves studied your case. Pain in knee joint with swelling is suggestive of ligament injury. You need to see a doctor and get MRI of the knee joint.It will tell us if there is any injury to cartilage or ligament. According to that further management can be planned. You need to apply ice and wear knee brace till then.Avoid walking or knee bending. </s>