AP and lateral elbow xray
Assess for anterior fat pad
Assess for anterior fat pad
Knowledge of ossification centers of the elbow can be helpful (see Elbow X-ray)
Radial head fracture 
Distal humerus fracture
Jefferson fracture
Radial head fracture
Navicular fracture
Essex-Lopresti fracture
Triquetrum fracture
Capitellum fracture