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As far as I understand it, MP involves only the lateral femoral sensory nerve. It does not go down to the shin, and does not
hurt in the buttocks. (It travels in the abdomen).

However, the sciatic nerve and other nerves do go down the buttocks. There is a condition where compression in the muscles of the buttocks...can happen...This is piriformis syndrome.

Here is a medical site for doctors that explains hip pain in general. It has a portion devoted to MP.

Figure 2A shows the sciatic nerve coming out into the buttocks on its way down the back of the leg.

Figure 2B shows the lateral femoral nerve exiting the abdomen to the front and lateral thigh.
http://www.aafp.org/afp/2000/0401/p2109.html

This link explains piriformis syndrome:
http://en.wikipedia.org/wiki/Piriformis_syndrome

Sitting on a hard floor for a long time, could compress this nerve (sciatic) where it exits the buttocks.