When you give a thumbs-up and notice your digit bends backward at an unusually dramatic angle, you’re witnessing what medical professionals call “distal hyperextensibility” — though most people know ...

Some people have thumbs that are hypermobile. This means they bend backward beyond the typical range. The medical term for hitchhiker’s thumb is distal hyperextensibility. It is also known as Z-shaped ...

When you text or use your smartphone, you’re making repetitive movements and putting your thumb through a wide range of motion. Your thumb isn’t really designed for these types of movements. A study ...