Which of the following is a device used to measure the degree of joint movement? Multiple choice question. Pedometer Tape measure Protractor Goniometer
The correct answer and explanation is:
Correct Answer: Goniometer
A goniometer is the device specifically used to measure the degree of joint movement, also known as the range of motion (ROM) of a joint. It is commonly used by physical therapists, occupational therapists, chiropractors, and other healthcare professionals to assess and monitor joint mobility, especially in patients recovering from injury or surgery.
Explanation:
The goniometer typically consists of two arms—one stationary and one movable—and a protractor-like scale marked in degrees. During an assessment, the axis of the goniometer is aligned with the joint being measured, the stationary arm is aligned with the stationary part of the limb, and the movable arm is aligned with the moving part. As the joint is moved, the angle is read on the protractor scale, indicating the degree of motion.
Goniometry is essential in both clinical and research settings for:
- Diagnosing joint problems
- Tracking progress during rehabilitation
- Determining functional limitations
- Documenting improvements or deterioration over time
Why the other options are incorrect:
- Pedometer: This device counts the number of steps taken by a person and is often used to monitor physical activity, particularly walking or running. It does not provide any information about joint angles or range of motion.
- Tape measure: While a tape measure can be used to measure limb length or circumference (for example, to assess swelling), it is not capable of measuring angles or joint mobility.
- Protractor: Though a goniometer includes a protractor-like component, a standard protractor on its own is not practical for clinical measurement of joint angles. It lacks the design features that allow it to align with anatomical landmarks and follow limb movement.
In conclusion, the goniometer is the specialized and correct tool for accurately measuring the degree of joint movement.