It has a few names but is basically known as a reflex hammer.
Doctor's use a knee hammer to see how well your knee reflexes work
Peg leg
There is no such thing as a doctor that specializes in leg injuries. If you have a leg injury, you should go to your local emergency department for treatment.
PODIATRY
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Dr. Mudd was the first doctor to treat Booth's Leg. He said it was a minor break. A week later, Dr. Stuart was the second doctor to treat Booth's leg. When questioned by federal troops, he denied helping Booth.
Your doctor will do straight leg rising test. Normally you should be able to bend leg to 90 degree. when your disc protrudes, you may not be able to do the leg rising test.
YES
A lawsuit
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Consult a doctor.
See a doctor as soon as you can.