Use proper technique Source.

Can you break your wrist punching someone. If you bend your wrist inwards too far or strike using just your outer knuckles youll end up injuring your hand. If you want to go with a regular punch when breaking the board youll need to line up your wrist so that its even and youre using the right knuckles. If you punch with your forearm and wrist straight the force of the impact rides your arm up to your elbow shoulder and torso.

Symptoms of Broken Sprained Wrists. So instead of striking with the more prominent and somewhat stronger index and middle finger knuckles one hits with the fifth. Depends on how hard you hit and where your punching is connecting.

So whats the worst that could happen if. If you land a punch on their forehead your more likely to break their hand. However in many cases the wrist looks pretty normal maybe a little bit swollen and its not as clear.

Falling onto an outstretched hand is one of the most common causes of a broken wrist. A wrist fracture is a medical term for a broken wrist. Even real boxers get it wrong often enough that the most common injury caused by punching failure is known as boxers fracture.

Youll either miss or commonly punch wrong and hit the jaw and break your hand. A nice blow to the jaw or nose shouldnt break your hand unless you hit super hard or have really fragile hands. Opt for a straight punch to break the board with your knuckles.

To make a proper fist curl your fingers into your palm then lock your thumb over your first two fingers. If you connect with your pinkyring finger knuckles your more likely to break your hand. You also align your wrist with your forearm so you are less likely to bend your wrist back or down and break it.