An apparatus and method for evaluating a hypertonic condition in a movable extremity are described. The apparatus includes an accelerometer, a gyroscope, a force sensor and a data communication device for transmitting data signals to a data processor. The method includes moving a limb through a range of motion about an axis of rotation while measuring parameters such as acceleration, velocity, the force on the limb, and the time to move it through the range of motion. The measured parameters are transmitted to a data processor which generates and displays information that characterizes the hypertonic condition for immediate feedback to the examiner or storage in a database for monitoring of the patient's condition. An apparatus and a method for simulating movement of a limb that has a hypertonic condition based on characterizing information from a real limb are also described.