Woman with right elbow pain after a fall

Clinical introduction

A 46-year-old woman presented to the emergency department with right elbow pain after falling down on an outstretched hand while descending the stairs. Physical examination showed right elbow swelling, tenderness and limited motion. The distal limb circulation and neurovascular function were unremarkable. Plain radiographs were obtained (figure 1).

Figure 1

Plain radiographs of the right elbow indicating the possible diagnosis.

Question

What is the most likely diagnosis?

Terrible triad injury

Monteggia fracture-dislocation

Isolated radiocapitellar dislocation

Occult supracondylar fracture

Answer

C (Isolated radiocapitellar dislocation)

Discussion

Plain radiographs …