Electrical stimulation of a human knee. In one example embodiment, a method for electrical stimulation of a human knee may include positioning first, second, third, and fourth surface electrodes on the skin over acupuncture points Stomach 34, Stomach 36, Spleen 9, and Spleen 10, respectively, and sending, to the first, second, third, and fourth surface electrodes, during a single treatment, a first current followed by a second current. The first current may be sent at a first frequency for a first time period and the second current may be sent at a second frequency for a second time period. The first frequency may be different from the second frequency.
