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What kind of a step were you taking when it happened? Pushing off? Landing? On the ball of your foot? On your heal? Foot flat? Is the pain actually in your knee, like directly under the knee cap or around the edges of the knee cap? Sitting in a chair, if you put some pressure on the back of your knee with your hand, does it hurt? Does it hurt just to stand or only when there is the added pressure of taking or landing steps?
The hot knife feeling usually means the nerve is involved. If it is centralized to the area of your knee it is most likely not terrible damage, just means whatever moved is pushing on the nerve. If that hot knife feeling pulses down your leg, that is a sign of more serious issues.
The knee is not a very complex joint, but magically there are a million ways to mess it up. If you are in pain tomorrow at work, tell them you wanna go to the emergency room, they are not allowed to deny that. As a part of your health insurance I am sure they will do MRI's or at least give you a referral to a specialist that will do a work up.
Do not take knee injuries lightly. Whatever damage is done and left unchecked will never magically heal itself. I wrecked my knees a long time ago. If I knew then what I know now I would have done things much differently. The knee is the only joint in your body that is expected to carry the full load of your body weight thousands of times a day, don't take that lightly.
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