But there are no matching grooves on the styloid process.

Take a look right here. I found a cleft fracture of the styloid process.

This explains the cleft fracture on the victim's styloid process. You lost me, Bones.

Significant damage to the capitate, the hamate and styloid process of the third metacarpal.

Beginning stages of osteonecrosis. See here? On the ulna at the styloid process.

He saw one of the world's most venomous fish and was taking a look at it from above the surface of the water, when someone forcibly pushed his head down into the tank, causing a cleft fracture of the styloid process.