Abstract: An apparatus and a method are provided for assessing the condition of the lumbar spine of a patient. The apparatus comprises a pelvis restraint for holding the patient's pelvis fixed, a harness adapted to be secured in a fixed orientation to the patient above the lumbar spine, the harness being connected to the pelvis restraint and movable relative thereto and the harness being spring biased to a neutral position and rotatable therefrom in a first or second rotational direction against the spring biasing, and, a torque measurement device associated with the harness for measuring torque generated by the patient who twists his back in the first rotational direction and in the second rotational direction.