A mains electricity (AC-powered) device designed to continuously move one or more joints (shoulder, elbow, wrist, hand/fingers, hip, knee, ankle, and/or feet/toes) without patient assistance during continuous passive motion (CPM) exercise therapy. It typically consists of a motorized carriage with pads and straps to hold and support the limb/digit, and an electrical control unit for the healthcare professional to set the variable range of motion and motion speed; it may additionally be intended to provide active resistance. It is typically intended to stimulate articular tissues, circulation of synovial fluid, reduce joint oedema, and provide neuromuscular and/or coordination training.