Knuckles behind the hand help the fingers to maneuver ahead and backward. They are really essential in fight athletics like wrestling and boxing. Sprain and strains – Quite a few hand and wrist injuries are because of sprains whereby ligaments that hook up two bones turn into stretched or torn. https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/