Though you can easily purchase one yourself, a goniometer is meant for properly trained health professionals who know how to use it for best results. For example, a therapist may use the tool to obtain a baseline range of motion measurement of a specific joint after an injury. After an intervention, they may measure again to ensure that the treatment is effective.
Types of Goniometers
A traditional goniometer is pretty basic. It is usually made of clear plastic, sometimes metal, and some cost just a few dollars.
They come in different sizes: Small goniometers are meant to measure range of motion around the joints of your fingers, thumbs, and hands. Large goniometers are used to measure your hips or knees.
While the most basic form of goniometer is a physical piece of equipment, new forms have been developed. Most notably:
Goniometers that strap to a body part to measure range of motion while you moveDigital goniometers: Studies have shown that they’re as accurate or better than the basic versions. Goniometer apps on portable devices like smartphones: These use your device’s accelerometer and gyroscopic technology to measure changes in the position of the phone. You simply open the app, place your phone in the correct position on your body part, and move your body through its available range of motion. One study found this method to be equally effective to basic goniometers in terms of measuring range of motion.
Why Goniometers Matter
While strength receives a lot of attention, range of motion is an often-ignored measurement of it fitness. It is an indicator of flexibility as one ages.
If your therapist uses a goniometer to measure your range of motion and notes a decreased motion from your baseline, they can help you improve your joint’s mobility with stretching and other interventions. Repeat use of a goniometer can help measure your improvement.
Increased (or preserved) range of motion means better mobility and injury prevention long term.
A Word From Verywell
One thing to ask any physical therapist: How do goniometric measurements figure into your overall rehab program and assessment? While a goniometer can be used effectively to measure joint range of motion, the quality of that motion—how things are moving—may be of equal importance. Your PT should take both quantity and quality motion into account when assessing your condition.
