Lunate Dislocation

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What type of fracture is this?

Correct – you need to get both right angled views. Based on this view it is probably a LUNATE Dislocation A lunate dislocation happens typically following a fall onto the wrist. This is an x-ray diagnosis. There will be swelling and there may be median nerve signs (due to direct nerve pressure by the bone). Notice the crescent half moon shape of the lunate-from which it gets its name. This injury is treated in theatre. The way to determine if it is a lunate dislocation is to draw a line thru the shaft of the radius. this should coincide with the long axis of the capitate. The carpal bones should all lie in line with the radius. Only the lunate should be off axis. The capitate usually sits within the concave part of the lunate. When dislocation occurs, the lunate is rotated so that the concave part faces anteriorly.

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Dr Peter Kas

Emergency Physician, Educator. Key Interests: Resuscitation, Airway, Emergency Cardiology, Clinical Examination. Creator

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