Final answer:
The superior articular surfaces of the tibia are the smooth, flattened areas on the medial and lateral condyles at the proximal end of the tibia, which articulate with the femur to form the knee joint.
Step-by-step explanation:
The superior articular surfaces of the tibia refer to the areas on the medial and lateral condyles of the proximal tibia that articulate with the condyles of the femur to form the knee joint.
These surfaces are smooth and flattened, and between them lies the intercondylar eminence, an elevated area that serves as the attachment point for knee ligaments. Additionally, the tibial tuberosity is on the anterior side of the proximal tibia, providing attachment for the patellar tendon.