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Servomotor systems with leg brace attachment. Servomotor drive system actuates leg from hip and knee joints, and ankle joint is held statically by leg brace. Hip joint is driven directly by rotation motor, while knee joint is driven by motor through ball-screw mechanism and linkage. Reaction torque transducers at hip and ankle measure joint torque response to imposed movement. Reaction force transducer is attached at bottom of ball-screw mechanism to measure force from which knee joint torque is calculated. Ming Wu, PhD; et.al