Fig. 2

Mason Type I Fracture with loose joint body in the anterior compartment. a-c CT scan showed a mildly (< 2 mm) displaced radial head fracture without blocking of motion and an osteochondral fracture fragment in the anterior elbow compartment. d The loose joint body [LB] was arthroscopically removed after identification between humerus [H] and coronoid process [CP]. e Dynamic evaluation of unimpaired motion in the proximal radioulnar joint [PRUJ] was arthroscopically confirmed. f Exploration of the radial head in full supination. g Posterolateral rotational instability was ruled out with a modified “drive through test” with a switching stick from the soft spot portal between ulnar [U] and humerus [H]. h, i Postoperative x-rays demonstrated correct alignment of the elbow joint and complete removal of loose bodies