Current research points to several factors that further the progression of the osteoarthritis at the knee. Obesity, genetics, previous injury, and knee joint alignment have been reported. As genetics and previous injury presently offer little recourse for modification, obesity and knee joint alignment offer opportunity. Both obesity and knee joint alignment can be viewed as behaviors that can be altered. At the joint level, the deleterious effects of weight and alignment manifest in the form of increased joint force. Contact time over contact surface area are factors that define stress concentration in the joint.