You're probably looking for an orthopedic doctor. They specialize in bone and joint issues.
The doctor that specialises in bones, tendons and ligaments is called an Orthopedist.
Orthopedist.
a orthopedist
chiropractor
You would call them a Forensic Scientist.
it usually depends on what kind of doctor, and what times you are on call and stuff
Podiatrist
A neurologist works on problems with the brain and nervous system.
You must shave your knees, moisturize (I find lubriderm works best), and run everyday.
The front knees are called the "Knees", the hind ones are called "Hocks".
they transplant your knees giving you hard functional new knees that will in turn correct your grammer.
If you have knock knees you can see an orthopedic doctor to see if there is anything they can do to help you to rectify the situation.
Kneeling down
24/7 which means you can call them at 5am and they'll come straight to your door
I am not sure why your knees would hurt while walking. If it does not go away I would call a doctor.