Human beings are well designed for many things. We have large brains for poetry and quantum mechanics; we are good long distance runners, and of course have these awesome opposable thumbs. Unfortunately, some parts are not designed very well for our 21st century lifestyles. The low back, or lumbar spine, is first on my list for sending back (or forward?) to the engineers. A close second though might be the "knee cap" or patellofemoral joint.
The "knee cap" or patella is an ovoid shaped...

