fatty pad

In anatomy, a "fatty pad" refers to a mass of fat cells, also known as adipose tissue, that serves as padding between organs or within joints. These pads, sometimes called plicae adiposae, are wedge-shaped and project into the synovial cavity of joints. Their primary function is to contribute to the "internal streamlining" of the joint cavity by deforming easily and preventing turbulent motion of the synovial fluid. They also help maintain a thin layer of synovial fluid between articulating surfaces, which is crucial for lubrication. Fatty pads are particularly large in the knee, elbow, and ankle joints. Adipose tissue in general acts as an energy store and provides insulation.12