Systems, devices and methods for treating a targeted body tissue (e.g., bone, soft tissue, muscle, ligaments, etc.) by stimulating the body tissue with an electric current are described herein. In one embodiment, an apparatus includes a first orthosis member that includes a first electrode. The first orthosis member is configured to be disposed about a first portion of a limb of a user of the apparatus such that the first electrode is in contact with the first portion of the limb. The apparatus includes a second orthosis member that includes a second electrode. The second orthosis member is configured to be disposed about a second portion of the limb such that the second electrode is in contact with the second portion of the limb. A connector is configured to couple the second orthosis member to the first orthosis member and the connector has a selectively adjustable length.