My friend had a scapholunate ligament rupture when he was young, but he received no treatment for it. He got the injury by falling out of a tree he had climbed to see his girlfriend, and he didn't want to tell his parents that he had gone over there while grounded.
He is now in his thirties, and he can make a creepy sound with his wrist. Last night, he set it on the kitchen table and popped it back and forth rapidly. It scared me, because it just seemed wrong.
He told me that his doctor had wanted to put a screw in there to fix the situation. However, he asked the doctor if it would make it hurt any less or improve his flexibility, and the doctor said no. So, he saw no reason to have it done.