Hi there,
The orthopod will probably have to send you for an MRI. I had pain and popping behind my left knee and it was a torn meniscus (easilty corrected through arthroscopic surgery). However, the radiating in the front of the thigh is different.
Have patience - they will figure it out. Cortisone injections are normally short lived (3 days to 3 weeks) and aren't usually a permanent solution. But it may be something that some physical therapy will help.
Keep us posted!
Tranquility
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