Key result
Acromion posterior angle correlates with glenoid retroversion, identifying critical retroversion in osteoarthritis above 15 degrees.
Why the study?
Posterior eccentric glenoid wear increases complication rates after shoulder arthroplasty, and the reported association between acromion shape and glenoid retroversion remains controversial.
Cross-Sectional (n=237)
Effect estimate: R2 = 0.48
p-value: p=< 0.0001
The acromion posterior angle is strongly associated with glenoid retroversion, particularly in normal scapulae, and can help identify critical retroversion in osteoarthritic shoulders.
Association between acromion shape and glenoid retroversion remains controversial; 3D angles leave open predictive value for arthroplasty complications.
Posterior eccentric glenoid wear is associated with higher complication rates after shoulder arthroplasty. The recently reported association between the acromion shape and glenoid retroversion in both normal and osteoarthritic shoulders remains controversial. The three-dimensional coordinates of the angulus acromialis (AA) and acromioclavicular joint were examined in the scapular coordinate system. Four acromion angles were defined from these two acromion landmarks: the acromion posterior angle (APA), acromion tilt angle (ATA), acromion length angle (ALA), and acromion axial tilt angle (AXA). Shoulder computed tomography scans of 112 normal scapulae and 125 patients with primary glenohumeral osteoarthritis were analyzed with simple and stepwise multiple linear regressions between all morphological acromion parameters and glenoid retroversion. In normal scapulae, the glenoid retroversion angle was most strongly correlated with the posterior extension of the AA (R2 = 0.48, p < 0.0001), which can be conveniently characterized by the APA. Combining the APA with the ALA and ATA helped slightly improve the correlation (R2 = 0.55, p < 0.0001), but adding the AXA did not. In osteoarthritic scapulae, a critical APA > 15 degrees was found to best identify glenoids with a critical retroversion angle > 8 degrees. The APA is more strongly associated with the glenoid retroversion angle in normal than primary osteoarthritic scapulae.
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Terrier et al. (2022) conducted a cross-sectional in Primary glenohumeral osteoarthritis and normal shoulders (n=237). Morphological acromion parameters (acromion posterior angle) was evaluated on Correlation between morphological acromion parameters and glenoid retroversion (R2 = 0.48, p=< 0.0001). The acromion posterior angle (APA) was strongly correlated with glenoid retroversion in normal scapulae (R2 = 0.48, p < 0.0001) and an APA > 15 degrees identified critical retroversion in osteoarthritis.
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