Annotated image
Frontal
Lateral
The blue arrow indicates the abnormal articular surface of the capitellum, and the blue dotted line outlines the expected shape of the capitellum in a normal elbow.
The yellow arrow points to the ossicle, which appears to represent a normal-variant ossicle, however the other two osseous fragments (open white arrows) suggest this is degenerative (secondary) synovial osteochondromatosis.