Most people don’t even want to say the “s-word,” shank, but there’s a reason why people do it. When high handicappers who fade or slice the ball start to open their stance more and more, their over-the-top swing and open clubface introduces the heel of the club to the ball at impact.
For better players who tend to draw the ball, they tend to swing more in-to-out and bring the hosel into play by swinging too far from the inside, causing the same result. More often, shanks occur when players are chipping and as a result of simply standing too close to the ball.