Flexion means 'bending'.

Page updated September 2023 by Dr Sheila Strover (Clinical Editor)

range of motion
Knee range of motion.


Flexion range of motion

A straight leg is said to be at zero (0) degrees of flexion. A fully flexed knee may reach about 140 degrees of flexion, depending on the muscle/fat bulk of the limb.

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Forum discussions

  • arthrofibrosis, loa

    A ski injury with investigative arthroscopy triggered internal scarring (arthrofibrosis) and loss of range of motion in the knee. The discussion focuses on rehabilitation.

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Dr Sheila Strover (Editor)
BSc (Hons), MB BCh, MBA

See biography...