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. 2014 Dec 23;9(12):e115670. doi: 10.1371/journal.pone.0115670

Figure 2. Rotation of femoral and tibial segments about their centre of masses.

Figure 2

Forces acting on the segments include the quadriceps tendon force (QT), patellofemoral joint contact force (PFJ), tibiofemoral joint contact force (TFJ), patellar tendon force (PT) and cruciate ligament forces (either anterior cruciate ligament (ACL) or posterior cruciate ligament (PCL) force – the ACL is depicted here). The insert shows the changing point of application of the PFJ and TFJ on the femoral segment with increasing knee flexion.