The tibiofemoral joint possesses two degrees of freedom: flexion and extension in the sagittal plane and, provided the knee is at least slightly flexed, internal and external rotation.
Sagittal plane motion at the knee.
A, Tibial-on-femoral perspective (femur is stationary).
B, Femoral-on-tibial perspective (tibia is stationary).
Ref: Kinesiology Of Musculoskeletal System
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