Abstract
BackgroundWe 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.MethodsWe 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.ResultsThe 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.ConclusionsComputerized tomographic measurements of the glenoid cavity yielded reliable values consistent with those in the literature.
Highlights
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
Arthroscopy surgery was developed to minimize the surgical morbidity of open surgery and to improve functional treatment outcomes
Restoration of these equilibrating factors and of the movement arc of the shoulder is important to enable the return to normal activities, for young patients who engage in sports [2]
Summary
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. Shoulder instability is one of the most challenging problems involving the shoulder joint due to its frequency and variety of anatomic and pathologic alterations, but mainly because of the high risk of recurrence even after surgical repair [1,2]. The risk of recurrence of post surgical instability is low whether open or by arthroscopic surgery, this procedure still leaves the surgeon somewhat apprehensive as to the final results. Treatment of shoulder instability should be based on reconstruction of the stabilizing mechanisms [4]. Restoration of these equilibrating factors and of the movement arc of the shoulder is important to enable the return to normal activities, for young patients who engage in sports [2]
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