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Hello, I'm Dr. Mark. I am board certified (USA), and have twenty years experience. Please allow me to review your question.
Do you have any lower back pain?
The pain you describe does sound like irritation of a nerve, either the L5 nerve in your lower back (part of the sciatic nerve), or the peroneal nerve on the outside of your knee.
Either way, nerve irritation can improve with time. Try taking ibuprofen (if allowed) to help with the pain.
Your doctor can evaluate you, and if there is a concern with a "pinched" nerve in the lower back, MRI of the lumbar spine would be ordered for diagnosis.