The knee is a hinge joint.
synovial
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In soccer, shin guards protect your knee. In volleyball, knee pads protect your knee. In basketball, your kind of on your own for protecting the knee. In softball, long socks might help you out, but not entirely.
patela a bone whitch made of hyline cartilage work as like a cap of knee and decrease friction beetween the knee joint with the help of synovial fluid
your joint is the function of your kneecap.The knee cap (also known as patella) is used to cover and protect the anterior articular surface of the knee joint.
The patella, also known as the knee cap or knee pan, is a thick, circular-triangular bone which articulates with the femur and covers and protects the anterior articular surface of the knee joint. It is the largest sesamoid bone in the human body.
Knee cap
Fluid build up above the knee cap
The knee actually has two joints. One is called the tibiofemoral joint and is between the thigh bone (femur) and the main shin bone (tibia). The other joint is formed by the thigh bone and the knee cap (patella) and is called the patellofemoral joint. The class of joints that these form are called synovial, or freely moving joints. The specific types are: tibiofemoral joint = hinge joint and the patellofemoral joint = gliding joint.
The knee is a hinge joint.
Epithelial tissueBoneCartilageMuscle