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KEY FACTS
Terminology
Imaging
Top Differential Diagnoses
Diagnostic Checklist
TERMINOLOGY
Abbreviations
- Subacromial impingement syndrome (SIS)
- Anterior subacromial impingement syndrome (ASIS)
Synonyms
- External impingement, extrinsic impingement, supraspinatus (SS) impingement, outlet impingement, classic impingement
Definitions
- Painful compression of SS tendon and subacromial (SA)-subdeltoid (SD) bursa between coracoacromial (CA) arch and humeral head
- CA arch
- Anterior acromion process
- CA ligament
- Acromioclavicular (AC) joint
- Inferior border of outlet is humeral head
- Older individuals
- Most commonly diagnosed shoulder disease
- CA arch
- Painful compression of SS tendon and subacromial (SA)-subdeltoid (SD) bursa between coracoacromial (CA) arch and humeral head
IMAGING
General Features
Radiographic Findings
CT Findings
MR Findings
Ultrasonographic Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Staging, Grading, & Classification
Gross Pathologic & Surgical Features
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Reporting Tips
Selected References
- Sasiponganan C et al: Subacromial impingement anatomy and its association with rotator cuff pathology in women: radiograph and MRI correlation, a retrospective evaluation. Skeletal Radiol. 48(5):781-90, 2019
- Gammaitoni AR et al: Predicting response to subacromial Injections and lidocaine/tetracaine patch from pretreatment pain quality in patients with shoulder impingement syndrome. Pain Med. 16(7):1333-40, 2015
- Rhon DI et al: Management of the unilateral shoulder impingement syndrome. Ann Intern Med. 162(3):237-8, 2015
- Tasaki A et al: Quantitative and qualitative analyses of subacromial impingement by kinematic open MRI. Knee Surg Sports Traumatol Arthrosc. 23(5):1489-97, 2015
- Kanatli U et al: The role of radiological subacromial distance measurements in the subacromial impingement syndrome. Eur J Orthop Surg Traumatol. 23(3):317-22, 2013
- Tuite MJ: Magnetic resonance imaging of rotator cuff disease and external impingement. Magn Reson Imaging Clin N Am. 20(2):187-200, ix, 2012
- Campbell RS et al: External impingement of the shoulder. Semin Musculoskelet Radiol. 12(2):107-26, 2008
- Hambly N et al: Rotator cuff impingement: correlation between findings on MRI and outcome after fluoroscopically guided subacromial bursography and steroid injection. AJR Am J Roentgenol. 189(5):1179-84, 2007
- Brossmann J et al: Shoulder impingement syndrome: influence of shoulder position on rotator cuff impingement--an anatomic study. AJR Am J Roentgenol. 167(6):1511-5, 1996
- Fu FH et al: Shoulder impingement syndrome. A critical review. Clin Orthop Relat Res. (269):162-73, 1991
- Seeger LL et al: Shoulder impingement syndrome: MR findings in 53 shoulders. AJR Am J Roentgenol. 150(2):343-7, 1988
Related Anatomy
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References
Tables
Tables
KEY FACTS
Terminology
Imaging
Top Differential Diagnoses
Diagnostic Checklist
TERMINOLOGY
Abbreviations
- Subacromial impingement syndrome (SIS)
- Anterior subacromial impingement syndrome (ASIS)
Synonyms
- External impingement, extrinsic impingement, supraspinatus (SS) impingement, outlet impingement, classic impingement
Definitions
- Painful compression of SS tendon and subacromial (SA)-subdeltoid (SD) bursa between coracoacromial (CA) arch and humeral head
- CA arch
- Anterior acromion process
- CA ligament
- Acromioclavicular (AC) joint
- Inferior border of outlet is humeral head
- Older individuals
- Most commonly diagnosed shoulder disease
- CA arch
- Painful compression of SS tendon and subacromial (SA)-subdeltoid (SD) bursa between coracoacromial (CA) arch and humeral head
IMAGING
General Features
Radiographic Findings
CT Findings
MR Findings
Ultrasonographic Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Staging, Grading, & Classification
Gross Pathologic & Surgical Features
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Reporting Tips
Selected References
- Sasiponganan C et al: Subacromial impingement anatomy and its association with rotator cuff pathology in women: radiograph and MRI correlation, a retrospective evaluation. Skeletal Radiol. 48(5):781-90, 2019
- Gammaitoni AR et al: Predicting response to subacromial Injections and lidocaine/tetracaine patch from pretreatment pain quality in patients with shoulder impingement syndrome. Pain Med. 16(7):1333-40, 2015
- Rhon DI et al: Management of the unilateral shoulder impingement syndrome. Ann Intern Med. 162(3):237-8, 2015
- Tasaki A et al: Quantitative and qualitative analyses of subacromial impingement by kinematic open MRI. Knee Surg Sports Traumatol Arthrosc. 23(5):1489-97, 2015
- Kanatli U et al: The role of radiological subacromial distance measurements in the subacromial impingement syndrome. Eur J Orthop Surg Traumatol. 23(3):317-22, 2013
- Tuite MJ: Magnetic resonance imaging of rotator cuff disease and external impingement. Magn Reson Imaging Clin N Am. 20(2):187-200, ix, 2012
- Campbell RS et al: External impingement of the shoulder. Semin Musculoskelet Radiol. 12(2):107-26, 2008
- Hambly N et al: Rotator cuff impingement: correlation between findings on MRI and outcome after fluoroscopically guided subacromial bursography and steroid injection. AJR Am J Roentgenol. 189(5):1179-84, 2007
- Brossmann J et al: Shoulder impingement syndrome: influence of shoulder position on rotator cuff impingement--an anatomic study. AJR Am J Roentgenol. 167(6):1511-5, 1996
- Fu FH et al: Shoulder impingement syndrome. A critical review. Clin Orthop Relat Res. (269):162-73, 1991
- Seeger LL et al: Shoulder impingement syndrome: MR findings in 53 shoulders. AJR Am J Roentgenol. 150(2):343-7, 1988
