Before revision: When in a tight fist, the flat of the fingernails can dig into the palm and push the skin down to create a bridge to stabilize the first structure and prevent hyper flexion of the knuckle joints (which can be observed by doing pushups with the entire backside of the fingers flat on the ground, fingers pointing towards the opposite hand).
After revision: When in a tight fist, the flat of the fingernails can dig into the palm and push the skin down to create a bridge to stabilfdsfdsfsfsfdsfize the first structure and prevent hyper flexion of the knuckle joints (which can be observed by doing pushups with the entire backside of the fingers flat on the ground, fingers pointing towards the opposite hand).