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Inclinometers designed to measure the angle of displacement (known as the range of motion or ROM) of a joint by using a mechanism that includes a calibrated dial. These inclinometers consist of a calibrated dial that directly measures the ROM; typically the inclinometer is placed against the bone and never leaves contact with the patient during the movement of the joint. Inclinometers may be used in pairs when the motion to be evaluated has two joint components (e.g., spinal movements). Dial calibrated inclinometers are available in a variety of types, including (1) bubble inclinometers that include a circular tube partially-filled with a colored fluid that moves with motion and a circular dial with degree markings, and (2) gravity inclinometers consisting of twin rotating dials with a locking mechanism and frequently with a strap for fixing to the body. Dedicated dial calibrated inclinometers intended for a particular joint (e.g., wrist) are also available. Inclinometers are used by rheumatologists and physical therapists to assess joint function and to diagnose and treat locomotor system diseases; they can be included as a component of gait and joint laxity analyzers. Inclinometers have replaced goniometer in many applications to obtain more accurate measurements.
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