Straight-leg tests are done to help find the reason for low back and leg pain. To do this test, you lie on your back with
both legs straight. Your health professional raises one of your legs upward,
keeping the knee straight.
Your doctor may do this test on each leg. The test stretches the sciatic nerve that runs down the back of your leg and the nerve roots that lead to it.
Neck strain is often just called whiplash. Although it's usually associated with car accidents, any impact or blow that causes your head to jerk forward or backward can cause neck strain. The sudden force stretches and tears the muscles and tendons in your neck.
Neck strain afflicts many amateur and professional athletes. People who play contact sports like football are especially prone to neck strain.
Neck strains are often confused with neck sprains. They're a bit different. Neck strains are...
If you have pain down the back of your leg below
the knee when your affected leg is raised, the test is positive
(abnormal). It means that one or more of the nerve roots leading to your sciatic nerve may be compressed or irritated.
If doing this test on the unaffected leg causes pain in
the affected leg, it helps to confirm that one of these nerve roots is compressed or irritated.
Compression or irritation of the nerve roots leading to the sciatic nerve can have several causes, but the most common is a herniated disc at the lowest part of your back.