Basically what happens is that you tear the tendon that is on the top of your finger and holds the last digit out straight. The ortho said the tendon is only about the size of 2 sheets of paper thick. So, if you're trying to straighten your finger and have some force push the tip down it can easily tear (or if you get cut on the top of your finger, etc...). It's a common injury in sports, but can also happen doing something as simple as making the bed and catching your finger on the sheet.
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