Original articleAn anthropometric study of the bilateral anatomy of the humerus
Section snippets
Specimens
This study used 28 dry humeri from 14 individuals (Department of Anatomy, University of Western Ontario, London, Ontario, Canada). These specimens had previously had all soft tissues removed. Specimens with any evidence of previous surgery, trauma, arthritis, or proximal humerus dysplasia were not included. Information about the age, gender, and hand dominance of the donors was not available.
Measurement technique
Pertinent bony landmarks and select regions of the bone were digitized with a stylus probe attached to 1
Results
All anthropometric results are summarized in Table II and Figure 11. Of the 11 humeral characteristics examined, only the humeral head height was significantly different between right and left humeri in the same individual (P < .005).
Most of the humeral characteristics had excellent intra-specimen repeatability, with an SD of less than 1 mm among 5 trials. Humeral head retroversion angle, however, was not as repeatable. The maximum SD between measurements was 4.4°, with a range as large as
Discussion
This study has shown that the anatomy of the humerus is consistent from side to side within an individual. This has been shown for a variety of anatomic measurements of interest in shoulder hemiarthroplasty. A significant difference was found only for the humeral head height. The humeral head height was significantly different between left and right paired specimens, and the mean difference was 1.1 ± 0.7 mm (Table III). Though not found to be significantly different, the humeral head
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