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Re: knee swelling
I agree with the above. Immediate swelling (within an hour or so) is likely to be one of two issues - an anterior cruciate tear or a patella dislocation. Of course an intrcapsular fracture would also cause this. The PCL is less likely as it tends to tear the posterior aspect of the capsule and bleeds down the calf looking a lot like a large bruise.
Effusions post injury (not spontaneous) that take a lot longer to come up are more likely to be meniscal in origin.
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