I would not suggest a neurologist.
I would suggest an orthopedist, a non invasive one, as the initial treatment is physical therapy, and if too far advanced, orthopedic surgery.
In addition, circulation problems need to be excluded in this lack. It does not act like this, but lower extremity dopplers should still be done.
This distribution is not specifically the sciatic nerve, although close, and if spinal disease, involved more than the sciatic nerve.
The initial treatment is not neurological treatment, but rather physical therapy However, there is enough about this that it might not be a compressed nerve problems.
Tendonitis, with arthritis in the knee needs to be ruled out as well.
X ray and MRI might be the initial tests, not EMG.
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