What causes pain in the groin area with burning pains down to the knee and painful spasm gets worse with activity?

Unusual symptoms: Intriguing to consider the sartorius syndrome named after latin for tailor, "sartor", or some such. The old sewing machines required push pedals. Repetative peddling causes overuse and stress of a long strap muscle that runs from inside of knee , through mid high, and into the groin. With rest and avoidance of the inciting mechanical activity will likely resolve..