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"I've never seen or heard of this before," said Horowitz. One possible explanation is brain damage from the illness, he said.
Here And it's not the only species that has this: Here. It includes the Common Shrew, Nothern Shortial Shrew, the Egyptian Gerbil, the commercially bred Silver Fox, while the paper is about Harvest Mice.
Of particular interest are domestic dogs and wolves of the genus canis. They have 78 chromosomes while foxes have a varied number from 38-78 chromosomes. The uniformity of chromosome number in canid dogs can be due to free interbreeding over a wide range, whereas foxes live in small family groups and smaller territories so that new arrangements will persist.
These abnormalities cause abnormal distribution of wear and tear on joints, meaning that the joints wear out and can lead to osteoarthritis.
Out of every 100 random audience members, about three people in it will have features that we commonly call double-jointed [source: Elliott].
I can personally attest to this being true. I am losing some range-of motion, and I show signs of early arthritis. As far as the pain, with a really bad headache, it can take up to 1000 mg of Aspirin or Acetaminophen. Thankfully I have a pretty high tolerance for pain, so I usually ignore what pills don't fix.
This ability must be honed in order to maintain it, though, whether you're a concert pianist or just a hypermobile hobbyist. If you have extra range of motion, you must keep your joints limber through regular stretching, or some of that ability may be lost as you age.
On the other hand (the extra-bendy one), hypermobility often comes with a steep price. There is an increased risk of arthritis in hypermobile joints, especially fingers. There may be extreme pain felt in many different joints, especially in younger people who are going through rapid growth spurts. Although some athletes may benefit from hypermobility, other people with hypermobile joints are more vulnerable to injuries. Several different but related conditions that cause pain or discomfort are grouped under the umbrella term hypermobility syndrome (HMS). To be clear, having joints with hypermobility doesn't mean you have HMS -- only if it's the source of chronic pain, which occurs in a minority of people with hypermobile joints. However, if you do suffer from HMS, there is a 1-in-2 chance your offspring will as well [source: Grahame].
Interestingly, if you can do things like put both feet behind your head and walk around on hyperextended arms while swinging your upper body between your elbows, local anesthetics may not be as effective on you as your less flexible compatriots. Research has indicated that local anesthetics seem to have little or no effect on many hypermobile people, something you may want to mention to your doctor if you have a medical procedure or pregnancy approaching.