<s>[INST] I was in an car accident 2years ago, I didn t have any problems until the last month or so. I can not get out of bed without extreme knee buckling pain/pressure. when I extend my right foot or reach certain directions I get a sharp pain in area down my leg. I have also gained over 65pnds in the last 12months. could this be caused by pain or accident or both [/INST] Hi, It is unlikely for accident before 2 years to cause your current knee problem. Current problem is likely related to your weight gain with stress on knee. Buckling and imbalance may be due to ligament injury in the knee.  I would like to advise MRI of the involved knee joint to check for ligament and meniscus pathology. Please get it done from radiology center nearby you. Meanwhile, wear knee brace. If pain is severe take tablet Attract P twice a day can be taken. Visit to orthopedic surgeon for detailed clinical examination is recommended.  Hope I have answered your query. Let me know if I can assist you further.   </s>