MP is a sensory damage only to a sensory nerve: Lateral femoral nerve. It comes out the spine at L5L4 (different genetically in some people), goes into the abdomen and exits under the ligament in the groin near the hip. It is only sensory.
It does not affect muscle function.

But there are OTHER nerves, the femoral one that do affect the muscles. This is not MP exactly.

Here is a website to read and has diagrams:
http://www.aafp.org/afp/2000/0401/p2109.html

Damage to the spine may impact both nerves, in which case your treatment should target the lumbar area.

You could try Lidoderm patches back there for a month or so and it may help. I had MP from a C-section that damaged my right lateral femoral nerve, and the Lidoderms worked very well for me and stopped the nerve from firing. I used them on my upper thigh where the nerve exits the abdomen.

You would probably do better on the spinal are as that is where you injury is.

Discuss this with your doctor, because Lidoderms are RX only.
I think it is worth a try before trying more invasive solutions.