<s>[INST] I was training MMA last night and a guy did a submission on me called heel hook. Didnt experience any pain and continued to train for maybe an hr after that. Fast forward to night time i wake up and go to get drink and can barely walk. Wen i go to straighten my leg im geting alot of pain on the inner part of my knee. What coud this be pulled muscles or tendons? [/INST] Hi there, thanks for the question. Pain during straightening of the knee, particularly more on the inner side can be a sign of internal derangement of the knee joint. Meniscus is one such internal structure between the two bones of the knee which can cause similar pain. Ice packs application can help relieve the pain during first 2 to 3 days. If the pain still persist orbital is inability to move the LED without pain. It is advisable to meet an Orthopedic or sport medicine specialist and get evaluation of the knee done. All the best. With regards. </s>