A system, an apparatus, and a method for measuring muscle stiffness in a predetermined joint of an individual are provided. The system and apparatus comprises a measuring unit and a processing unit. The measuring unit is configured to be applied to a body segment of the predetermined joint. The processing unit is configured to: receive a plurality of data sets from the at least one measurement device, analyze the plurality of data sets for one or more indications of an elicited stretch reflex, and calculate a muscle stiffness score. The muscle stiffness score is based on at least a difference between a first stiffness and a second stiffness. The first stiffness is determined from the first subset, and the second stiffness is determined from the second subset.