ok, i guess ill step in and be a professional here.
Hi, im a physical therapist. If you injured our knee in such a way that it gave out on you and has now swollen, then yes you need to have this looked at.
Xrays are no use for soft tissue injuries, they ill not expose any ligamentus, meniscal or cartilage damage. I would recomend you either see a sports physical therapist or better still a sports medicine doctor. Most GPs will just give you anti-inflamatories and tell you to rest, which is useless.
if who ever you see believes you have more than basic ligamentous damage (a grade 1 or 2 mcl or lcl injury), they may recomend you go and have an MRI to determine how much damage you have done.
That said, if you have done some serious cruciate anterior or posterior ligament damage, they may be able to tell with basic ligamentous stress tests.
Best case scenario, youve done some medial or lateral ligamentous damage and probably some meniscal damage.
But i cant diagnose that shit from here, so go get it checked out.
pm me or repost if you need any more help bro.
Heloo, my name is Shane Mckonkey. I was born in Vancouver Canada, thats aboot three hours north of, ah, seattle.
Right now were here in Bella Coola Canada, and ah, weve been shut in by the weather for like three weeks eh. We havn't shot fuck all. Ooh, Soory.
We've just been sittng around, eating pasta, and spending loonies and toonies on Kokanee and peelers.
But, as soon as this weather clears, im gunna pull on my toque, eat some canadian bacon, and ah, im keen to giver.