What is the point of splinting a sprained finger?

Immoblization. A sprain is usually meant to imply a stretching or tear of a soft tissue structure such as a ligament. So you want to allow that structure to rest and repair itself. If it is constantly moving this will be harder and inefficient. Hence immobilization is done.

Related Questions

I sprained my index finger on Saturday and on Sunday I Googled my symptoms and it comes up with a sprained finger, I brought a finger splint today, I can still move it, and the pain is subsiding a bit now. Just wondering how long should I keep it on? Also

Keep moving. The movement is definitely a good thing. You don't want to completely NOT move it for a week because that will cause unnecessary stiffness and likely cause the healing to be longer than it would normally. Typically somewhere between 5-7 days depending on how the finger is feeling. It's not an exact science. And just so you know, I can't see the last part of your question on here- sorry! Good luck! Read more...
3-4 days. You don't really need to wear a splint for a finger sprain. If it makes it feel better to wear it, that is okay to use it, but make sure to take it off several times a day and move your finger around so that it does not get stiff. I would not suggest wearing it for more than 3-4 days if you do wear it. Read more...