An apparatus, comprising: an electrode base ; and an electrode assembly , including: a first conductor member coupled to the electrode base; a second conductor member coupled to the electrode base; a first pad coupled to the electrode base such that the first conductor member is disposed between the electrode base and the first pad, the first pad and the first conductor member collectively forming a first electrode, a portion of the first pad configured to contact a skin surface; and a second pad coupled to the electrode base such that the second conductor member is disposed between the electrode base and the second pad, the second pad having a different shape than the first pad, the second pad and the second conductor collectively forming a second electrode, a portion of the second pad configured to contact the skin surface, the second electrode differing from the first electrode in size; the electrode base configured to be releasably couplable to an orthosis by one of hook and pile fasteners, press-studs, magnetic couplers or specialized holders that press a conductive back of the electrode assembly against a conductive stud or panel inside the orthosis, or a combination thereof such that the first conductor member and the second conductor member are each electrically coupled to the orthosis and not electrically coupled to each other. an electrode base ; and an electrode assembly , including: a first conductor member coupled to the electrode base; a second conductor member coupled to the electrode base; a first pad coupled to the electrode base such that the first conductor member is disposed between the electrode base and the first pad, the first pad and the first conductor member collectively forming a first electrode, a portion of the first pad configured to contact a skin surface; and a second pad coupled to the electrode base such that the second conductor member is disposed between the electrode base and the second pad, the second pad having a different shape than the first pad, the second pad and the second conductor collectively forming a second electrode, a portion of the second pad configured to contact the skin surface, the second electrode differing from the first electrode in size; a first conductor member coupled to the electrode base; a second conductor member coupled to the electrode base; a first pad coupled to the electrode base such that the first conductor member is disposed between the electrode base and the first pad, the first pad and the first conductor member collectively forming a first electrode, a portion of the first pad configured to contact a skin surface; and a second pad coupled to the electrode base such that the second conductor member is disposed between the electrode base and the second pad, the second pad having a different shape than the first pad, the second pad and the second conductor collectively forming a second electrode, a portion of the second pad configured to contact the skin surface, the second electrode differing from the first electrode in size; the electrode base configured to be releasably couplable to an orthosis by one of hook and pile fasteners, press-studs, magnetic couplers or specialized holders that press a conductive back of the electrode assembly against a conductive stud or panel inside the orthosis, or a combination thereof such that the first conductor member and the second conductor member are each electrically coupled to the orthosis and not electrically coupled to each other. <EOS>