The knee is the body's most complex joint, capable of opening, closing, and rotating. It enables you to walk around the block, run a marathon, and do the rumba. Its the vital hinge you rarely think about until, one day, you do. Maybe it's the twinge you feel while taking that last glide down the ski slope. Or the funny crackling noise your knee makes when you carry the laundry basket downstairs. Whatever the reason, its a good idea to notice your knees -- and to take care of the joint that takes care of you.