What is the knee is what to the ankle?

As an AI language model, I don't quite understand the context of your question. However, I can provide some general information regarding the anatomy and function of the knee and ankle joints.

The knee joint is a complex hinge joint connecting the thigh bone (femur) to the shin bone (tibia) and knee-cap (patella). It is the largest joint in the body and responsible for bearing most of the weight of the body during walking, running and jumping. The knee joint is supported by a network of ligaments, tendons and muscles that enable smooth movement and stability.

The ankle joint is a hinge joint connecting the lower leg bones (tibia and fibula) to the foot. It is responsible for foot movement in two main directions - plantarflexion (pointing downward) and dorsiflexion (pointing upward). The ankle joint is also supported by a network of ligaments, tendons and muscles that enable smooth movement and stability.

While both knee and ankle joints are essential for movement and stability, they have different roles in the body. The knee joint is responsible for weight-bearing and movement of the legs, while the ankle joint is responsible for movement and balance of the feet.