The tibia has two articulations in the knee with the femur, often referred to as the tibiofemoral components of the knee joint. This is the part of the knee joint.
The proximal tibiofibular joint is a small synovial joint that allows very little movement between the tibia and fibula. The joint is formed between the undersurface of the lateral tibial condyle and the head of fibula. The joint capsule is reinforced by anterior and posterior ligament of the head of the fibula. The distal tibiofibular joint is formed by the rough, convex surface of the medial side of the distal end of the fibula, and a rough concave surface on the lateral side of the tibia (information from Wikipedia).