What is the most common type of bone injury to the elbow?

Humerus/tibia/ulna: Your elbow is a complex joint formed by 3 bones: the humerus is a single bone in your upper arm that runs from your shoulder to your elbow. The radius and ulna, bones of your forearm, run from the elbow to the wrist. Ligaments, muscles, and tendons maintain your elbow's stability and allow joint movement. In children, fractures can affect the growth and development - if growthplate is injured.

Elbow fracture: Most common elbow fracture involves the radial head. Many occur from a simple fall onto outstretched arm. Fortunately, many do well without need for surgery. Other less common fractures include proximal ulna, or distal humerus. These tend to result from higher energy injuries, and typically require surgical repair.

Fracture: If you are asking about most common fracture about the elbow, then the radial head is the answer. Simple bone contusions are more common than fractures however.