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Os Acromiale
Michael J. Tuite, MD
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KEY FACTS

  • Imaging

    • Top Differential Diagnoses

      • Pathology

        • Clinical Issues

          • Diagnostic Checklist

            TERMINOLOGY

            • Synonyms

              • Unfused acromial apophysis, bipartite acromion
            • Definitions

              • Failure of osseous fusion between acromial apophysis and base of acromion process

            IMAGING

            • General Features

              • Radiographic Findings

                • CT Findings

                  • MR Findings

                    • Ultrasonographic Findings

                      • Imaging Recommendations

                        DIFFERENTIAL DIAGNOSIS

                          PATHOLOGY

                          • General Features

                            • Staging, Grading, & Classification

                              CLINICAL ISSUES

                              • Presentation

                                • Demographics

                                  • Natural History & Prognosis

                                    • Treatment

                                      DIAGNOSTIC CHECKLIST

                                      • Consider

                                        • Reporting Tips

                                          Selected References

                                          1. Roedl JB et al: Acromial apophysiolysis: superior shoulder pain and acromial nonfusion in the young throwing athlete. Radiology. 274(1):201-9, 2015
                                          2. Winfeld M et al: Differentiating os acromiale from normally developing acromial ossification centers using magnetic resonance imaging. Skeletal Radiol. 44(5):667-72, 2015
                                          3. Yammine K: The prevalence of Os acromiale: a systematic review and meta-analysis. Clin Anat. 27(4):610-21, 2014
                                          4. Smith J et al: Role of sonography in the evaluation of unstable os acromiale. J Ultrasound Med. 27(10):1521-6, 2008
                                          5. Burbank KM et al: Incidence of os acromiale in patients with shoulder pain. Am J Orthop. 36(3):153-5, 2007
                                          6. Ouellette H et al: Re-examining the association of os acromiale with supraspinatus and infraspinatus tears. Skeletal Radiol. 36(9):835-9, 2007
                                          7. Sahajpal D et al: Surgical management of os acromiale: a case report and review of the literature. Bull NYU Hosp Jt Dis. 65(4):312-6, 2007
                                          8. Abboud JA et al: Surgical treatment of os acromiale with and without associated rotator cuff tears. J Shoulder Elbow Surg. 15(3):265-70, 2006
                                          9. Kurtz CA et al: Symptomatic os acromiale. J Am Acad Orthop Surg. 14(1):12-9, 2006
                                          10. Pagnani MJ et al: Painful os acromiale (or unfused acromial apophysis) in athletes. J Shoulder Elbow Surg. 15(4):432-5, 2006
                                          11. Boehm TD et al: Rotator cuff tears associated with os acromiale. Acta Orthop. 76(2):241-4, 2005
                                          12. Youm T et al: Os acromiale: evaluation and treatment. Am J Orthop. 2005 Jun;34(6):277-83. Erratum in: Am J Orthop. 34(8):382, 2005
                                          13. Lee DH et al: The double-density sign: a radiographic finding suggestive of an os acromiale. J Bone Joint Surg Am. 86-A(12):2666-70, 2004
                                          14. Boehm TD et al: Os acromiale associated with tear of the rotator cuff treated operatively. Review of 33 patients. J Bone Joint Surg Br. 85(4):545-9, 2003
                                          15. Boehm TD et al: Ultrasonographic appearance of os acromiale. Ultraschall Med. 24(3):180-3, 2003
                                          16. Uri DS et al: Os acromiale: evaluation of markers for identification on sagittal and coronal oblique MR images. Skeletal Radiol. 26(1):31-4, 1997
                                          17. Jerosch J et al: [Arthroscopic subacromial decompression--indications in os acromiale?.] Unfallchirurg. 97(2):69-73, 1994
                                          18. Park JG et al: Os acromiale associated with rotator cuff impingement: MR imaging of the shoulder. Radiology. 193(1):255-7, 1994
                                          19. Hutchinson MR et al: Arthroscopic decompression of shoulder impingement secondary to Os acromiale. Arthroscopy. 9(1):28-32, 1993
                                          Related Anatomy
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                                          Related Differential Diagnoses
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                                          References
                                          Tables

                                          Tables

                                          KEY FACTS

                                          • Imaging

                                            • Top Differential Diagnoses

                                              • Pathology

                                                • Clinical Issues

                                                  • Diagnostic Checklist

                                                    TERMINOLOGY

                                                    • Synonyms

                                                      • Unfused acromial apophysis, bipartite acromion
                                                    • Definitions

                                                      • Failure of osseous fusion between acromial apophysis and base of acromion process

                                                    IMAGING

                                                    • General Features

                                                      • Radiographic Findings

                                                        • CT Findings

                                                          • MR Findings

                                                            • Ultrasonographic Findings

                                                              • Imaging Recommendations

                                                                DIFFERENTIAL DIAGNOSIS

                                                                  PATHOLOGY

                                                                  • General Features

                                                                    • Staging, Grading, & Classification

                                                                      CLINICAL ISSUES

                                                                      • Presentation

                                                                        • Demographics

                                                                          • Natural History & Prognosis

                                                                            • Treatment

                                                                              DIAGNOSTIC CHECKLIST

                                                                              • Consider

                                                                                • Reporting Tips

                                                                                  Selected References

                                                                                  1. Roedl JB et al: Acromial apophysiolysis: superior shoulder pain and acromial nonfusion in the young throwing athlete. Radiology. 274(1):201-9, 2015
                                                                                  2. Winfeld M et al: Differentiating os acromiale from normally developing acromial ossification centers using magnetic resonance imaging. Skeletal Radiol. 44(5):667-72, 2015
                                                                                  3. Yammine K: The prevalence of Os acromiale: a systematic review and meta-analysis. Clin Anat. 27(4):610-21, 2014
                                                                                  4. Smith J et al: Role of sonography in the evaluation of unstable os acromiale. J Ultrasound Med. 27(10):1521-6, 2008
                                                                                  5. Burbank KM et al: Incidence of os acromiale in patients with shoulder pain. Am J Orthop. 36(3):153-5, 2007
                                                                                  6. Ouellette H et al: Re-examining the association of os acromiale with supraspinatus and infraspinatus tears. Skeletal Radiol. 36(9):835-9, 2007
                                                                                  7. Sahajpal D et al: Surgical management of os acromiale: a case report and review of the literature. Bull NYU Hosp Jt Dis. 65(4):312-6, 2007
                                                                                  8. Abboud JA et al: Surgical treatment of os acromiale with and without associated rotator cuff tears. J Shoulder Elbow Surg. 15(3):265-70, 2006
                                                                                  9. Kurtz CA et al: Symptomatic os acromiale. J Am Acad Orthop Surg. 14(1):12-9, 2006
                                                                                  10. Pagnani MJ et al: Painful os acromiale (or unfused acromial apophysis) in athletes. J Shoulder Elbow Surg. 15(4):432-5, 2006
                                                                                  11. Boehm TD et al: Rotator cuff tears associated with os acromiale. Acta Orthop. 76(2):241-4, 2005
                                                                                  12. Youm T et al: Os acromiale: evaluation and treatment. Am J Orthop. 2005 Jun;34(6):277-83. Erratum in: Am J Orthop. 34(8):382, 2005
                                                                                  13. Lee DH et al: The double-density sign: a radiographic finding suggestive of an os acromiale. J Bone Joint Surg Am. 86-A(12):2666-70, 2004
                                                                                  14. Boehm TD et al: Os acromiale associated with tear of the rotator cuff treated operatively. Review of 33 patients. J Bone Joint Surg Br. 85(4):545-9, 2003
                                                                                  15. Boehm TD et al: Ultrasonographic appearance of os acromiale. Ultraschall Med. 24(3):180-3, 2003
                                                                                  16. Uri DS et al: Os acromiale: evaluation of markers for identification on sagittal and coronal oblique MR images. Skeletal Radiol. 26(1):31-4, 1997
                                                                                  17. Jerosch J et al: [Arthroscopic subacromial decompression--indications in os acromiale?.] Unfallchirurg. 97(2):69-73, 1994
                                                                                  18. Park JG et al: Os acromiale associated with rotator cuff impingement: MR imaging of the shoulder. Radiology. 193(1):255-7, 1994
                                                                                  19. Hutchinson MR et al: Arthroscopic decompression of shoulder impingement secondary to Os acromiale. Arthroscopy. 9(1):28-32, 1993