  Significant attention has been paid to robotic rehabilitation using various
types of actuator and power transmission. Amongst those, cable-driven
rehabilitation robots (CDRRs) are relatively newer and their control strategies
have been evolving in recent years. CDRRs offer several promising features,
such as low inertia, lightweight, high payload-to-weight ratio, large
work-space and configurability. In this paper, we categorize and review the
cable-driven rehabilitation robots in three main groups concerning their
applications for upper limb, lower limb, and waist rehabilitation. For each
group, target movements are identified, and promising designs of CDRRs are
analyzed in terms of types of actuators, controllers and their interactions
with humans. Particular attention has been given to robots with verified
clinical performance in actual rehabilitation settings. A large part of this
paper is dedicated to comparing the control strategies and techniques of CDRRs
under five main categories of: Impedance-based, PID-based, Admittance-based,
Assist-as-needed (AAN) and Adaptive controllers. We have carefully contrasted
the advantages and disadvantages of those methods with the aim of assisting the
design of future CDRRs
