It is used to limit the flexion of each of these joints or to keep them in an extended position.
It is very effective for Arthritic, Boutonniere conditions or for Mallet finger conditions and can hold the finger in different positions depending on how tight you want the splint to be worn. It can be used to slow down or even sometimes stop the progression of deviation from Arthritis.
This splint is adjustable and can allow for some flexion by squeezing the rings together. This will loosen the splint or you can make the splint tighter by spreading the rings further apart.