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THE RELATIONSHIP BETWEEN THE CORACOID AND THE GLENOID: HOW MUCH EROSION ALLOW THE USE OF THE CORACOID AS A BONE GRAFT?

Purpose
The Aim of this study was to determine the thickness of the coracoid process on the superoinferior plane (SI), as well as, to determine the distance between the posterior and anterior (AP) glenoid rim and, to establish a relationship between these two measurements.

Material and Methods
Sixty one Scapulas were analyzed on this study. The SI thickness of the coracoid, as well as, the AP distance of the glenoid were measured by tree examiners three times with a digital caliper. The reproducibility of these two measurements were analyzed by the Friedman test and the Wilcoxon test. The Spearman test was used to analyze the correlation between these two distances and the variability of this relationship were analyzed by the Kolmogorov-Smirnov test with significance when P< 0,05.

Results
On average the SI thickness of the coracoid, was 14.33 mm ±1.87 mm and the AP distance of the glenoid was 26.25 mm ± 2.68 mm. The Friedman test confirmed no significant difference among the three measurements of each examiner and, with the Wilcoxon Test it was observed a strong concordance among the three examiners (P<0,001). On average the SI thickness of the coracoid represented 54.20% of the AP glenoid distance. The Spearman correlation test showed a positive correlation, as well and, the Kolmogorov-Smirnov showed a normal distribution of this relationship.

Conclusion
The SI thickness of the coracoid was on average 14.33 mm ±1.87 mm and the AP glenoid distance was 26.25 mm ± 2.68 mm. The coracoid thickness represented, on average, 54.20% of the AP glenoid distance and, usually, if it increases, the AP glenoid distance would increase, as well. The coraroid can be used as bone graft even if there is 50% of anterior glenoid rim erosion.

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