What Causes Severe Pain In The Wrist On Bending?

I broke my wrist as a child. I have on and off wrist pain on my left wrist on the pinky side. It is a sharp pain and hurts the most when i bend my wrist towards the pinky side, especially when holding or pulling something. I am right handed so it is not my dominant had that hurts. I get the pain once every month to two months and usually lasts a couple days. It gets to the point where i can't move it at times