EVERYDAY SCIENCE

Detailed explanation-1: -The knee is a hinge joint formed by the tibia (shinbone), femur (thighbone) and patella (kneecap). The ends of the bones in the joint are covered with cartilage a tough lubricating tissue that helps cushion the bones during movement.

Detailed explanation-2: -Hinge joints, such as in the fingers, knees, elbows, and toes, allow only bending and straightening movements. Pivot joints. Pivot joints, such as the neck joints, allow limited rotating movements. Ellipsoidal joints.

Detailed explanation-3: -Hinge joints are present in knees and elbows.

Detailed explanation-4: -The main movement of the knee is flexion-extension. For that matter, knee act as a hinge joint, whereby the articular surfaces of the femur roll and glide over the tibial surface. During flexion and extension, tibia and patella act as one structure in relation to the femur.