Urgent... Sudden Knee Pain

[alberto1]

Hi I was at the gym earlier htting the punchbag and all of a sudden when i stood up straight after finishing a round my knee had a sudden pain i then tried to walk it off and realised i couldnt walk due to an extreme tighness across the patellar.

i then tried sitting and realised that my knee will not bend past 5 degrees odd without severe pain!

i have looked at my knee and its very swollen and seems to have shifted to the inner side of leg slightly, what could i have done?

i can bear weight on my leg with little to no pain but and lie straightened but theres no bending without excrutiating pain.

please reply thanks aaron.

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