Knee joints

Running and the knee joint
Time Magazine:

Is Running Bad for Your Knees? Maybe Not

http://www.time.com/time/health/article/0,8599,1948208,00.html

Exercise
How to start running barefoot - wikihow http://www.wikihow.com/Start-Barefoot-Running

Running In Shoes Stresses Hips, Knees And Ankles More Than Running Barefoot, Study http://www.medicalnewstoday.com/articles/175046.php

Biomedical Engineers 'Arm' Surgeons For Highly Precise Knee Resurfacing With Robot

http://www.sciencedaily.com/videos/2009/0107-fixing_damaged_knees.htm