Actually Lynn-a roo I am a Doctor of Chiropractic (D.C.). Neuro-musculo- skeletal is our speciality.
Bee it really sounds like sciatic. The most common and likey origin of sciatic pain is the lumbar spine.The deep pain in the glut is usualy the sciatic nerve irritation.The pain radiating down the leg is definately sciatic nerve. There is no other choice. Again we look to the most common site of irritaion and that is usualy the spine. Piriformis Sydrome can mimic lumbogenic or discogenic sciatica.I personally think the piriformis is commonly over diagnosed as a cause of sciatica.
We have a common saying if the pain is hard to describe it is almost always nerve pain. If it is nerve pain it most likely starts at its origin,the spine.
The pounding of running causes a shock wave of energy that pounds the lumbar spine.
The "feeling of needing to crack your back" is another indication that the lumbar spine is the source.Since the nerve pain travels through the butt and glut area many blame the pain on muscular strain of the gluteals or piriformis when it is actually the sciatic nerve radiating through that area.

Last edited by Rod; 01/26/11 09:56 PM.