Hi, thanks for writing to HCM.
As your xrays are negative for a fracture and you still experience severe pain
in the knee, I suspect intraarticular soft tissue injuries either the meniscus
or the ligaments (ACL,PCL or Collaterals).
An MRI scan is needed to diagnose any soft tissue injury
inside the knee joint.
I assume that your heel numbness
could be due to a tightly applied brace which might be pressing over the superficial nerves. Just loosen the brace lightly to resolve the numbness.
Hope this information is helpful. Good day