X-ray
Lateral
Lateral
The lateral film demonstrates:
- joint effusion
- semilunar fragment displaced anteriorly and superiorly consisting of capitellum and the lateral half of trochlea
- typical “McKee’s double-arc sign”: One arc representing the capitellum, and the second arc represents the ridge of the trochlea
Features consistent with a type IV capitellum fracture (according to Bryan and Morrey classification with McKee modification).