Knee extension occurring from femoral condyles rotating forward on tibia as a person stands from a squatting position is an example of the accessory motion called

Arthrokinematics

Explanation:

According to my research on various studies conducted by medical professionals, I can say that based on the information provided within the question this is an example of the accessory motion called Arthrokinematics. This is when a a specific point on one articulating surface comes in contact with a series of points on another surface. Like seen in the picture below.

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