### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
On Tuesday during volleyball practice I fell on my knee, I have very severe pain it struck down the lower half of my right leg. I was able to walk but it would hurt and I couldn t bend it. I didn t tell my coach or anyone, I just walked it off and seemed to go away. The second time I dove for the ball and hit my knee just slightly and it felt even worse. It had swelled up just a bit and turned red. After a few hours it went away. I m wondering if I tore something or I don t know. I felt pain under my knee cap when I walked. It was numb and I couldn t feel it for a while as well it didn t hurt at the touch because like I said it was numb, I could only feel the paineed when I walked or attempted to... the sports trainers had put my injury down as a knee cap dislocation but I know that is not what it is.

### output:

With such presentations in my clinic, I would straight away diagnose it as ligament injury in the knee joint. But It's nothing to do with knee cap dislocation as your coach said. I advice you to do MRI knee joint to knee to know which ligament affected, and that particular ligament teared or displaced. Based on that ill go for diagnostic and therapeutic arthroscopy and treat it. As you are a sports person you should follow the above advice as soon as possible, because chances of extending the tear is more.  By the mean time you can wear knee belt to decrease the pain while walking in your free time.  Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions.  Wishing you good health.