Practice
Easily Missed?
Perilunate dislocation
Cite this as:
BMJ
2012;345:e7026
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I am surprised that such a blatantly obvious velar lunate dislocation was missed. What is often missed, is the scapho-lunate disassociation by virtue of the rupture of the scapho-lunate ligament, leading to a gap, often called the Terry Thomas sign by the older generation. Careful observation of the PA & lateral films of Gilula's lines, the "3Cs" sign - ie the normal articular gaps seen between the distal radius, lunate and capitate as shown in the poor quality later radiograph of figure2, will reduce the risk of missing these injuries.
Robert's first figure on the anatomy of the carpal tunnel is more accurate. The transverse section of the wrist going through the proximal carpal row and not the distal carpal bones, would be more relevant. As most A&E radiography technicians do and interpret/report, and nurse practitioners & junior doctors are in the forefront, it is important that education should be focused on these groups, by constructive feedback.
Competing interests: None declared
Norwich Community Hospital, 44Brettingham Avenue, Cringleford, NR4 6XQ
I am sure that I will not be the only one to notice the quality of the image - Figure 1, in this article. It is a totally inadequate representation of the carpal tunnel and will do little to keep anatomy "alive" at a time that less and less attention is being paid to the subject.
The median nerve looks like a tendon and its branches totally unrealistic, the flexor tendons are arranged entirely wrongly, the median nerve seems to be "invading" the synovial sheaths which in turn are quite incorrectly drawn.
Just to give you some idea as to how the carpal tunnel should be represented, I attach two images. I fully appreciate that you wanted to keep the image simple but this is no reason to draw it so badly.
Competing interests: None declared
University of Cambridge , Selwyn College, Cambridge CB3 9DQ
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