This document provides an overview of the biomechanics of the knee complex. It describes the anatomy of the tibiofemoral and patellofemoral joints, including the femoral condyles, tibial plateaus, and surrounding ligaments. It explains that the knee allows for flexion, extension, and rotation. It also discusses how the alignment of the femur and tibia influences weight distribution and stresses on the medial and lateral compartments during activities like walking. Abnormal alignments like genu valgum or varum can increase risks of conditions like osteoarthritis.