Purpose
The purpose of this study was to evaluate the measured dimensions of the normal glenoid
on sagittal magnetic resonance (MR) imaging to determine whether a fixed ratio of
glenoid length and width can be determined.
Methods
MR images of 90 glenoids in 84 patients were analyzed. The mean age was 54.8 years,
with 44 male and 40 female patients. Glenoid length and width at the widest dimension
were measured and recorded by 3 independent examiners. The ratio of length to width
and the ratio of the length of the superior pole at the widest point to the total
length were calculated. Intraclass correlation coefficients, Spearman and Pearson
correlations, regression analysis with cross validation, and coefficients of variation
were calculated.
Results
The mean glenoid length was 37.5 ± 3.8 mm, whereas the mean width was 24.4 ± 2.9 mm.
The mean ratio of length to width was 1.55 ± 0.1, whereas the mean ratio of the distance
from the superior pole to the widest point to the total glenoid length was 0.64 ±
0.03. The calculated ratios were less variable than the absolute length and width.
Cross validation of length for width showed a 95% prediction band width of 4.48 mm,
with an average absolute error of prediction of 1.46 mm, and was equally specific
when separated by gender. The width was equal to 0.65 times the length.
Conclusions
Measurement of glenoid length and width using MR imaging results in a consistent ratio
of length to width independent of patient age and gender, where the width was equal
to 0.65 times the length at a point two-thirds along the inferosuperior axis.
Level of Evidence
Level IV, case series.
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Article info
Publication history
Published online: May 08, 2014
Accepted:
March 10,
2014
Received:
March 6,
2013
Footnotes
The authors report the following potential conflict of interest: N.N.V. received royalities/stock options (Smith & Nephew), did consulting (Smith & Nephew, Arthrosurface); A.R.R. received royalities/stock options (Arthrex), did consulting (Arthrex); B.J.C. received royalities/stock options (Arthrex, DJO), did consulting (Arthrex, Zimmer, Depuy).
Identification
Copyright
© 2014 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.
