Q. When knee goes from flexion to extension the tibia -
a. Externally rotates
b. Internally rotates
c. Remains neutral
d. Rotates and then comes back
e. Goes into anteroposterior translation
Answer -
a
As the knee is reaching full extension to stand upright ( stance phase), the tibia externally roates to lock the knee and tightens cruciate for stable knee whereas in swing phase it goes into internal rotation relative to native femur.
This phenomenon is called ' screw home mechanism' of the knee.
a. Externally rotates
b. Internally rotates
c. Remains neutral
d. Rotates and then comes back
e. Goes into anteroposterior translation
Answer -
a
As the knee is reaching full extension to stand upright ( stance phase), the tibia externally roates to lock the knee and tightens cruciate for stable knee whereas in swing phase it goes into internal rotation relative to native femur.
This phenomenon is called ' screw home mechanism' of the knee.
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