Cartalige
The periosteum is a strong fibrous membrane that covers the long bone except at joint surfaces. It plays a crucial role in bone formation, repair, and nourishment.
the patella covers the top of the knee joint.
The joint between the sacrum and the hip bone is the sacroiliac joint. It is also known as the SI joint. They form the articular surfaces.
cartilage
The smooth layer of connective tissue protecting the bone surfaces in a synovial joint is called articular cartilage. It helps reduce friction and absorb shock during joint movement.
Articular cartilage
Actually it's cartilages and the synovial fluid which makes the joint movements smooth.....
Periosteum is the connective tissue that covers that parts of bone other than the articular cartilage.
The periosteum is a tough fibrous membrane that covers the shaft of a long bone. It contains blood vessels, nerves, and serves as a point of attachment for ligaments and tendons.
I guess this question is "what is your patella?" In which case, the answer is that the patella is the knee cap, the bone that covers the ball-and-socket joint of the tibia and fibula with the femur bone in the knee.
Articular cartilage is cartilage which covers the surface of the bone in synovial joints. Its function is to reduce friction between the bones. It is a type of cartilage called hyaline cartilage.
Hyaline cartilage covers the ends of bones in many joints. It provides a slippery surface to reduce friction during bone movement.