Knee injury from fall down steps

I fell one week ago down a full fllight of steps.  I had a concussion and pain on my left side, primarily my hip and knee.  I have been off work and resting most of the time.  I have lots of bruising, which is expected.  My left knee is very painful; I can bend it and there is no perceptible swelling but it is difficult to walk.  It hurts on the outer side.  I had xrays of my pelvis and hip and a CT scan in the ER but nothing done with my knee.  

I wonder if it's possible to have an injury of significance without swelling?  I have thought perhaps I should schedule an appointment with an orthopedist or maybe try to get my regular physician to order some sort of test - MRI?  Any suggestions as to what to do next are appreciated.

[Dr Vinod]

Hello!

You should apply ice packs and take pain killers for your knee pain. If the pain continues even after a week then get some scans done.

Ask your primary physician to go for an X-ray and if you do not have any findings then follow up with an orthopedician and go for a subsequent MRI for a proper diagnosis.

Avoid weight bearing on the injured knee and do not stress yourself.

Take care!