Ishii H, Brunet JA, Welsh RP, Uhthoff HK (1997). ""Bursal reactions" in rotator cuff tearing, the impingement syndrome, and calcifying tendinitis". J Shoulder Elbow Surg. 6 (2): 131–6. doi:10.1016/S1058-2746(97)90033-1. PMID 9144600. McAfee JH, Smith DL (1988). "Olecranon and prepatellar bursitis. Diagnosis and treatment". West. J. Med. 149 (5): 607–10. PMC 1026560. PMID 3074561. Perry J (1983). "Anatomy and biomechanics of the shoulder in throwing, swimming, gymnastics, and tennis". Clin Sports Med. 2 (2): 247–70. doi:10.1016/S0278-5919(20)31406-X. PMID 9697636. Reilly JP, Nicholas JA (1987). "The chronically inflamed bursa". Clin Sports Med. 6 (2): 345–70. doi:10.1016/S0278-5919(20)31035-8. PMID 3319205.Trojian T, Stevenson JH, Agrawal N (2005). "What can we expect from nonoperative treatment options for shoulder pain?". J Fam Pract. 54 (3): 216–23. PMID 15755374. Shamus, Jennifer; Shamus, Eric (2001). Sports injury: prevention & rehabilitation. New York: McGraw-Hill Medical Pub. Div. ISBN 978-0-07-135475-2. Starr M, Harbhajan K (June 2001). "Recognition and Management of Common Forms of Tendinitis and Bursitis" (PDF). The Canadian Journal of Continuing Medical Education: 155–63. ISSN 0843-994X. Trojian T, Stevenson JH, Agrawal N (2005). "What can we expect from nonoperative treatment options for shoulder pain?". J Fam Pract. 54 (3): 216–23. PMID 15755374.
van Holsbeeck M, Strouse PJ (1993). "Sonography of the shoulder: evaluation of the subacromial-subdeltoid bursa". AJR Am J Roentgenol. 160 (3): 561–4. doi:10.2214/ajr.160.3.8430553. PMID 8430553. Yanagisawa K, Hamada K, Gotoh M,  et al. (2001). "Vascular endothelial growth factor (VEGF) expression in the subacromial bursa is increased in patients with impingement syndrome". J. Orthop. Res. 19 (3): 448–55. doi:10.1016/S0736-0266(00)90021-4. PMID 11398859. S2CID 20098903.
Subacromial bursitis is a condition caused by inflammation of the bursa that separates the superior surface of the supraspinatus tendon (one of the four tendons of the rotator cuff) from the overlying coraco-acromial ligament, acromion, and coracoid (the acromial arch) and from the deep surface of the deltoid muscle. The subacromial bursa helps the motion of the supraspinatus tendon of the rotator cuff in activities such as overhead work. Musculoskeletal complaints are one of the most common reasons for primary care office visits, and rotator cuff disorders are the most common source of shoulder pain.Primary inflammation of the subacromial bursa is relatively rare and may arise from autoimmune inflammatory conditions such as rheumatoid arthritis, crystal deposition disorders such as gout or pseudogout, calcific loose bodies, and infection. More commonly, subacromial bursitis arises as a result of complex factors, thought to cause shoulder impingement symptoms. These factors are broadly classified as intrinsic (intratendinous) or extrinsic (extratendinous). They are further divided into primary or secondary causes of impingement. Secondary causes are thought to be part of another process such as shoulder instability or nerve injury.In 1983 Neer described three stages of impingement syndrome. He noted that "the symptoms and physical signs in all three stages of impingement are almost identical, including the impingement sign..., arc of pain, crepitus, and varying weakness". The Neer classification did not distinguish between partial-thickness and full-thickness rotator cuff tears in stage III.