The useless bone in the knee is the fabella bone which is a small sesamoid bone that is embedded in the tendon that is behind your knee.
The fabella bone is not essential for knee function in humans although the presence of the fabella bone is becoming more common in modern humans.
Not everyone has a fabella bone although many people are developing or being born with the fabella bone.
The extra bone in your knee is called a fabella bone and is also a sesamoid bone that means that the fabella bone also develops within a tendon which is the lateral head of the gastrocnemius muscle of the knee.
Your fabella bone is located in the back of your knee joint and near your fibula and is a fairy common anatomical variant that is found in 10 to 30 percent of the human population.
A fabella is a small bone called the sesamoid bone that is found behind your knee.
The fabella bone or sesamoid bone is embedded within the tendon of the lateral head of your gastrocnemius muscle.
The fabella bone also known as the sesamoid bone is an accessory bone, which means that it's present in aorund 20 percent to 87 percent of the population.
The fabella bone is also thought to have a role that is similar to that of the patella in redirecting the tensile forces that are generated by the muscles.
The exact function of the fabella bone is still being studied, although it's believed that the fabellas function is to help stabilize your knee and may also redirect the forces during the extension of the knee.
The fabella bone is more common in people in Asia and Oceania.
And if the fabella bone causes pain, especially during extension of the knee or strenuous activity, it can be referred to as fabella syndrome.
The presence of the fabella bone can be confirmed through palpation, which is feeling the bone or through an MRI or other imaging techniques.
If you have any pain that is present, treatment for pain with the fabella bone can include injections, physical therapy and even surgical removal of the fabella bone.