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6 ماه پیش
Dr.Abolfazl Hashempour

Do you have fabella? Bone thought lost to evolution is showing up in humans with arthritis Ashley Ma

Do you have fabella? Bone thought lost to evolution is showing up in humans with arthritis Ashley Ma
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Do you have a fabella? Bone thought lost to evolution is showing up in humans with arthritis
Ashley May
USA TODAY
A bone believed to be lost in human evolution is making a comeback, and no one is sure why, according to a new study.

The fabella, a bone just behind the knee found in primates, is showing up in humans, specifically those with arthritis and knee pain, research published in the peer-reviewed Journal of Anatomy this week reports.

“We are taught the human skeleton contains 206 bones, but our study challenges this," lead author Michael Berthaume from Imperial College London said in a statement.

The study, funded by the U.K.'s National Institute for Health Research, analyzed medical studies done over the past 150 years in 27 countries. It found that on average, people are nearly 3.5 times more likely to have the bone in 2018 compared to 1918.
found that the bone is most common among people with arthritis, as well as Asians and Australians. Authors say it can get in the way of knee replacement surgery and cause patients pain, but it's unknown if it could cause arthritis. It's purpose is still largely a mystery.

Berthaume theorizes that because today's average human is better nourished, taller and heavier, the bone might be showing up to provide knee support.
Researchers noted the increase in human fabella reports could be flawed because the small bone, occasionally made of cartilage, is difficult to locate on MRIs, X-rays and CT scans.

The research team is now looking at how common the bone, which isn't in all humans, shows up across genders, ages and regions.

Follow Ashley May on Twitter: @AshleyMayTweets
مطالعات نشان می دهند، از سال 1918 تا 2018، میزان بروز استخوان فبلا در زانوی انسانها، 3.5 برابر شده است.
استخوان فبلا، در هومونینها، و اجداد انسانهای اولیه...وجود داشته است که بتدریج در انسان مدرن حذف شده بوده است ولی در 150 سال گذشته، میزان بروز آن، افزایش داشته.
دانشمندان و آناتومیستها، معتقدند، دلیل برگشت این استخوان کوچک در انسان امروزی، بهبود وضعیت تغذیه، بزرگتر شدن و قویتر شدن جثه انسان و به تبع آن، انتقال نیروهای بیشتر بر مفاصل زانو از طریق عضلات و تاندونها است که منجر به برگشت این استخوان کوچک شده است که ممکن است نقشی در اعمال نیرو...

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