More force goes through you knee when doing stairs - when coming down a force of 3.5x body weight goes through your kneecaps!
The most common causes of pain going downstairs is
1) Runners Knee - a problem with how the kneecap moves
2) Chondromalacia Patella - thinning of the cartilage lining the kneecap
3) Arthritis - wear and tear of the cartilage and bone
you oviously use the joints in your knees and the motion of your hips to propel the movement of your legs
Not usually. Leg pain while jogging is most commonly caused by weak knees, overweight and/or other straining in your knees. If you can't jog due to leg pain, I would recommend you use an elliptical machine. Elliptical machinery puts very little pressure to your leg joints which make the possibility for your knees to hurt smaller. If your leg pain continues, you should contact a medical professional.
Yes. It causes pain in the hands and knees.
Yes
Knees pain
You can find information on pain in the knees when running at http://www.coolrunning.com//engine/2/2_5/194.shtml There is tons of information on knee pain of all different kinds.
More bone usage going down, More musle usage going up.
No not normally
Under the knees if the person is on their back, between the knees if they are on their side.
Spending a lot of time on your knees can cause pain after a while. Answer: spend less time on your knees.
Pain in the front of the knees could be due to conditions such as patellofemoral pain syndrome or patellar tendinitis. Pain on the sides of the knees could be due to iliotibial band syndrome or lateral collateral ligament sprain. It's important to see a healthcare provider for an accurate diagnosis and appropriate treatment plan.
Lumbar pillows can be used under your knees, neck or back. The pillow will help to ease pain of whichever area you choose to use it. For neck pain, you can sleep on it, or use it as a headrest in a high backed chair.