Conversation: The conversation between human and AI assistant.
[|Human|] I hit my knee really hard and the athletic trainer at my school said it would be stiff and bruise alot, but it hasn t bruised at all. it still hurt to put weight on the leg or bend it for extended periods of time, but there s no visible bruising. why not?
[|AI|]  Hello, Injury in the knee can damage basically 3 structures in the knee. 1. If there is any bony injury this is difficult to put weight on affected limb and is very painful and needs an x-ray for exact assessment and treatment.2. If there is any soft tissue injury you have variable intensities of pain depend on how hard you hit your knee and x-ray is needed for assessment.3. Ligament injuries, if there is any ligament injury in the knee you feel a lot of pain, do not able to put weight on, and feels your knee is unstable. For this, we need an MRI scan for exact assessment and treatment. Regarding the bruising, this is not necessary that the knee will be bruised in every injury. It depends on how hard you got your knee injured.it can be or can not be in any of the above injuries. Hope I have answered the question. Let me know if I can assist you further.