Fig. 1From: Interobserver agreement on the sonographic severity grading of shoulder impingement syndromeLeft shoulder of a 37-year-old female with Grade-3 impingement scanned by first observer. Acromion-to-greater tuberosity distance in neutral position was 19.5Â mm while in abduction it was 15.7Â mm. The ratio between abduction and neutral position of the acromion-to-greater tuberosity distance was 0.80Back to article page