Patient fell on an outstretched elbow.

Ultrasound showed a subtle fracture of the radial head. A haemarthrosis was present.

It is important always to ultrasound the interosseous membrane, best seen from the dorsal aspect.

This ultrasound showed a torn interosseous membrane. With slight compression on the dorsal aspect, the muscles were seen to bulge through the torn membrane. The right side was normal.
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    Petrie de Villiers

    if radial head has to be removed and inteross memb is torn a prosthetic head must be put in otherwise the radius will retract and you developed ulnar impaction

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