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Orthopedic University Hospital Balgrist, Zurich, Switzerland
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In our retrospective study three age- and sex-matched patient groups with
21 patients each were stratified by the acromiohumeral distance measured on
conventional anteroposterior radiographs (group I,
7 mm; group II, 8-10
mm; and group III, > 10 mm). Although we have no data about weight or body
mass index for our patients, we believe that there was no recall bias for body
weight in our three age- and sex-matched patient groups. To the best of our
knowledge, there are no data in the literature documenting that the
acromiohumeral distance correlates with the body weight or body mass
index.
We were also aware of the usage of different terms such as conventional radiographs or plain films. After studying the radiologic and orthopedic literature in context to the acromiohumeral distance, we decided to use the term "conventional radiographs" in our study. Moreover, the term conventional radiographs was also suggested in the opinion letter mentioned by Dr. Hall that was published in the AJR in 1998 [2].
Again, we thank Dr. Hall for his interest in our article and his opinion with regard to body weight.
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