Petje, Gert, Peter Manndorff, Nicolas Aigner, Franz Landsiedl, and Rudolf Ganger. “Radiographic Evaluation of the Acromion in Impingement Syndrome: Comparison With Arthroscopic Findings in 147 Shoulders”. Acta Orthopaedica 71, no. 6 (January 1, 2000): 609–612. Accessed May 5, 2026. https://actaorthop.org/actao/article/view/20248.