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The sciatic nerve is the largest and longest nerve in the body. It arises from the spinal cord as a collection of fibers from the lower vertebrae. This nerve is responsible for the sensation of the skin of the foot and entire lower leg except for a small area on the inner side. It also supplies muscles in the anterior, lateral and posterior compartments of the leg.

How to: Lie on your back with your right knee bent and foot flat on the floor (a). With your left leg fully extended, press into your right foot to shift onto your left hip. This is your starting position (b). Then, squeeze your right glutes to press your left hip open until you feel a stretch, pause, then return to start. That’s one rep (c). Perform six to eight reps, then repeat on the opposite side.
There are cases of low back pain that have alarming causes, but it’s rare. Once in a while back pain is a warning sign of cancer, autoimmune disease, infection, or a handful of other scary culprits.7 Over the age of 55, about one in twenty cases turns out to be a fracture, and one in a hundred is more ominous.8 The further you are from 55, the better your odds.

You’ve heard the saying: it’s all in the hips, but for many of us, our hips – or more precisely, our hip flexors – are tight, stiff and inflexible. If you’re an office worker you can probably thank sitting down at your desk 8 or more hours a day for your tight hip flexors. Habitual sitting causes your hip flexors to tighten and shorten – adjustable standing desks, anyone?
A diagnostic SI joint injection may be performed to confirm the cause of pain. The SI joint is injected with a local anesthetic and corticosteroid medication. The injection is given using X-ray fluoroscopy to ensure accurate needle placement in the SI joint. Your pain level is evaluated before and 20-30 minutes after injection, and monitored over the next week. Sacroiliac joint involvement is confirmed if your pain level decreases by more than 75%. If your pain level does not change after the injection, it is unlikely that the SI joint is the cause of your low back pain.
You're more likely to get a hip flexor injury if you've had one in the past, you don't warm up properly before engaging in athletic activity, your muscles are already tight or stiff, or your muscles are weak from being overused. If, while exercising, you try to do too much at once in too short an amount of time, you can also put yourself at risk for a hip flexor injury.
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