I would like to talk to you about the saphenous nerve. Why am I talking about that today? The saphenous nerve could be the source of pain in your knee or anywhere down your leg, all the way down to your foot for various reason.
This nerve is a continuation of your femoral nerve. Your femoral nerve comes from your lower back... from your spinal cord, into your lower back and around your thigh. It gives into several branches. One of these branch is the saphenous nerve.
One thing to understand is that the saphenous nerve is a sensory nerve and it does not innervate any muscles.
If you sustained an injury to this nerve, you will not see really any particular weakness from that injury. Even without weakness, that could be the source of quite a bit of pain that could arise anywhere along the distribution of that nerve.