The fourth silver coin from the Czech Mint's series entitled Human Body is dedicated to the skeletal system – specifically the knee joint.

The skeleton forms a solid support for the body and, along with the muscles, is another subsystem of the musculoskeletal system. The optimal compromise between minimum weight and maximum load-bearing capacity of bones is achieved by a combination of a spongy internal structure and a very strong outer layer. The body of a newborn has around 300 bones, but some fuse or disappear during the ife. Zherefore, an adult human usually has 206 bones. Many of them are connected by joints, which allow bending and turning. The largest and most complex joint in the human body is the knee, where three bones meet. Its load is enormous – when walking, a force equivalent to up to three times our weight acts on the knee.

The reverse side of the coin, designed by medal maker Jan Štekl, DiS., features a coloured cross-section of a bent human knee. The composition is supplemented with the Latin inscription ARTICULATIO GENUS (knee joint). On the obverse side, which is common to the entire series, you will find a double helix DNA. As the coins of the Czech Mint are issued with a foreign licence from the island of Niue, they also bear its national emblem, the nominal value of 1 DOLLAR (NZD) and the year of issue 2025.

All twelve anatomical coins from the Human Body series can be stored in a spectacular collector's book, which is also offered by the Czech Mint.