The piriformis muscle connects the top of the femur to the spine, and it’s the main one that supports the outward movement of the hip, upper leg, and foot. The sciatic nerve can sometimes pass through this muscle and thus cause sciatica symptoms, otherwise known as piriformis syndrome, characterized by pain in the lower back and hips, poor movement, and balance. Therefore, the main cause of sciatica is the swelling or constriction of the piriformis muscle, but it can also be a result of some other factors as well.
People understandably assume that the worst back pain is the scariest. In fact, pain intensity is a poor indicator of back pain ominousness,10 and some of the worst causes are actually the least painful (especially in the early stages). For instance, someone could experience the symptoms of cauda equinae syndrome, and be in real danger of a serious and permanent injury to their spine, but have surprisingly little pain — even none at all in some cases!

Grade II (moderate): A larger tear in your muscle that makes it difficult to move and causes a moderate amount of pain, especially when you move the affected muscle, swelling, and tenderness. You may have 5 percent to 50 percent loss of function and you may be limping. You can't go back to sporting activities until the tear is completely healed. These injuries can take anywhere from a couple weeks to a few months to heal, depending on how bad they are.

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