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. 2013 Oct 18;6(1):42.
doi: 10.1186/1755-7682-6-42.

A new method to evaluate glenoid erosion in instable shoulder

Roberto Y Ikemoto  1 , Joel Murachovsky, Luis G Nascimento, Rogerio S Bueno, Luiz Henrique de Oliveira, Edson N Fujiki, Luiz Carlos de Abreu, Vitor E Valenti, Sergio L Checchia
Affiliations

A new method to evaluate glenoid erosion in instable shoulder

Roberto Y Ikemoto et al. Int Arch Med. .

Abstract

Background: We aimed to establish values and parameters using multislice reconstruction in axial computerized tomography (CT) in order to quantify the erosion of the glenoid cavity in cases of shoulder instability.

Methods: We studied two groups using CT. Group I had normal subjects and Group II had patients with shoulder instability. We measured values of the vertical segment, the superior horizontal, medial and inferior segments, and also calculated the ratio of the horizontal superior and inferior segments of the glenoid cavity in both normal subjects and those with shoulder instability. These variables were recorded during arthroscopy for cases with shoulder instability.

Results: The mean values were 40.87 mm, 17.86 mm, 26.50 mm, 22.86 mm and 0.79 for vertical segment, the superior horizontal, medial and inferior segments, and the ratio between horizontal superior and inferior segments of the glenoid cavity respectively, in normal subjects. For subjects with unstable shoulders the mean values were 37.33 mm, 20.83 mm, 23.07 mm and 0.91 respectively. Arthroscopic measurements yielded an inferior segment value of 24.48 mm with a loss of 2.39 mm (17.57%). The ratio between the superior and inferior segments of the glenoid cavity was 0.79. This value can be used as a normative value for evaluating degree of erosion of the anterior border of the glenoid cavity. However, values found using CT should not be used on a comparative basis with values found during arthroscopy.

Conclusions: Computerized tomographic measurements of the glenoid cavity yielded reliable values consistent with those in the literature.

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Figures

Figure 1
Figure 1
Image of sagital slice of the scapula on the face of glenoid cavity, with segments marked.
Figure 2
Figure 2
Computed tomography showing the glenoid with the measurements of each segment.
Figure 3
Figure 3
Photograph of measurement of glenoid cavity during arthroscopy.
See this image and copyright information in PMC

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