An apparatus and method for measuring the end range extension of the lumbar spine of a standing patient is disclosed. A brace device is provided for movably bracing the sacroiliac of the patient against backward movement and a hip holding device is also provided for holding the hips of the patient in contact with the brace device. A measuring device then measures the backward displacement of identifiable portion of the upper body of the patient to determine the end range extension. Preferably, a device is also provided for holding the feet of the patient against upward movement and to hold the feet directly below the hips. The knees are also preferably held in a locked position. The measuring device is adjustable to fit each individual patient appropriately.