chirogeek.com has dermatome mappings. Unfortunately they don't show any mapping to the groin. I have a vague memory of seeing one of the Sacrum levels mapping to the groin area.
I don't see anything obvious jumping out of your MRIs but imaging does not always reveal the problem(s).
Please take my ramblings with a grain of salt. Good luck in your investigation.
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Jim
2003 L5S1 Charite
1981 L5S1 Discectomy
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