A goniometer is a device for measuring the range of motion of a joint.
![goniometer](/sites/default/files/users/user1/goniometer_0.jpg)
The centre of the goniometer is placed on the jointline and the arms of the device point to hip and ankle.
By measuring the range of motion you can assess progress with rehabilitation, and especially assess any loss of extension. It is really important to regain full extension after a knee injury or surgery.
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