The knee is the largest and one of the strongest joints in the body. It is also delicate and complex. It joins the thigh with the leg and is made up of bones, ligaments, tendons, and cartilage. It consists of two joints: one between the femur and tibia and another between the femur and patella.
The knee is classified as a pivotal hinge joint, meaning it can straighten and bend in one direction while it allows some twisting to occur. This is known as flexion and extension; you will often hear your surgeons refer to this when discussing your knee.
Movements at the knee joint are essential to everyday life such as walking, climbing stairs, standing and sitting. Because it is such an integral part of normal activity, the knee is often susceptible to injuries and arthritis.