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Similarly one may ask, what is the normal knee flexion?
Knee range of motion: a. Normal range of motion, using the anatomical position as zero degrees. Flexion = 0 to 140 degrees. Extension - zero degrees = full extension.
Subsequently, one may also ask, what happens during knee flexion?
During knee flexion, tibia glides posteriorly on femur and from full knee extension to 200 flexion, tibia rotates internally. During knee flexion, femur glides anteriorly on tibia and from full knee extension to 200 flexion, femur rotates externally on stable tibia.
To regain flexion (bending) we recommend letting the knee hang off the side of the bed and using the opposite leg as a pusher to push the operated foot back. To regain extension (straightening) we recommend putting pillows under the heel while lying down and allowing the leg to come into extension (straight).