The morphometry of the coracoid process - its aetiologic role in subcoracoid impingement syndrome

Anatomical morphometric studies of the coracoid process and coraco-glenoid space were carried out on 204 dry scapulae. No statistically significant co rrelations were found between length, or thickness of the coracoid process, prominence of the coracoid tip, coracoid slope, coraco-glenoid distance, o r position of the coracoid tip with respect to the uppermost point of the g lenoid. These anatomical characteristics were independent. of the dimension s of the scapulae. Three configurations of the coraco-glenoid space were id entified. Type I configuration was found in 45% of scapulae and Type II and Type III, in 34% and 21% of specimens, respectively. The lowest value of t he coraco-glenoid distance were seen in Type I scapulae. Morphometric chara cteristics which might predispose to subcoracoid impingement were found in 4% of Type I scapulae. A total of 27 scapulae, nine with each type of confi guration were submitted to CT scanning. Scapulae with a Type I configuratio n were found to have low values for the coraco-glenoid angle and coracoid o verlap, which are known to be associated with a short coraco-humeral distan ce. Subjects with a Type I configuration, and severe narrowing of the corac o-glenoid space, appear to be predisposed to coraco-humeral impingement. Th ese morphometric characteristics may be easily evaluated on CT scans.