Odds and Ends: Patella

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1–2 minutes

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The patella is the knee cap. This round-ish bone is connected to your anterior thigh muscle (the rectus femoris) by the quadriceps tendon. The patellar tendon (that’s a mistake in that figure there!) attaches the patella to the tibial tuberosity on the tibia. As you flex your knee or bend your knee, the patella slides superior over the patellar surface on the femur. When you extend your knee or straighten your leg, the patella slides inferior over the patellar surface.

A diagram of the knee joint, labeled with the femur, patella, tibia, and fibula. The diagram also indicates "anterior" and "posterior" for directional reference. The skeletal structure is illustrated in a light tan anatomical style with blue cartilage at the joint.
Knee joint anatomy diagram showing femur, patella, tibia, and fibula.
Illustration of a human knee joint, anterior view. Major structures are labeled, including the quadriceps tendon, patella (kneecap), patellar tendon, and tibial tuberosity. The illustration depicts the bones, ligaments, and tendons that contribute to knee joint function.
Diagram of a knee joint showing the patella, tendons, and tibial tuberosity.

Explore this in 3D

Interactive 3D model of the lower limb bones (patella) — click and drag to rotate, scroll to zoom, and turn labels on or off. Open the 3D model in a new browser tab (opens in a new tab). 3D model courtesy of Cask Anatomy / Leiden University Medical Center, licensed CC BY-NC-SA.

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