In the body of a man found a bone, believed to be lost
It is believed that the human skeleton contains 206 bones. Found 207-I.
23 APR 2019 14:29
Each person has several sesamoid bones (lat. Sesamum). They are where the tendons spread over the joints (e.g. the wrist, knee or foot), protecting the tendons and increasing shoulder strength.
One of these bones is called fabella (lat. Fabella, “little bean”). She lurks in the tendon the calf muscles to the back side of the knee. From fossil monkey fabella supported patella and increased mechanical strength, but she was almost lost during evolution. However, a detailed study showed that fabella preserved in a much greater number of people.
Experts at Imperial College London found the earliest records of problems with his knees related to 1875. In the course of the research, the doctors discovered the presence of fabella from 17.9 percent of patients. But the function of the bone remained unknown: it has not been studied. Even found, it was seen as the exception to the rule.
Raising the medical archives of the 27 countries in the 150-year period, researchers sorted 21 thousand diagnoses related to knee joints, and found that fabella much more common and can not be an exception. If in 1918 fabella was present in 11.2% of the people, by 2018 – is already at 39%, that is, the spread increased 3.5 times.
No one knows why “lost” the bone is returned into the human body. It is known that sesamoid bones grow in response to mechanical stress. Today the average person eats better; he is taller and heavier than their ancestors. This has led to the evolutionary development of longer legs and large calf muscles. The result was increased pressure on the knees, and the body’s response could be to restore the “protection” of the bone. However, the study’s lead author, Dr. Michael Burt (Michael Berthaume) is not ready to say exactly why fabella. Like other sesamoid bones, it can reduce friction in the joints, redirecting the muscle force. But it can also be a kind of analogue of the Appendix: an obvious function in fabella no, but it brings the inflammation of the acute pain and other problems.
The next stage of the study, doctors plan to find out who exactly is TABELLA: it is necessary to analyze in different parts of the world among people of different ages, race and gender. All this will help to treat patients with problems of the knee.
Look at how varied the human face in the process of evolution.