title: Shear Wave Ultrasound Elastographic Evaluation of the Rotator Cuff Tendon.
abstract: OBJECTIVE
  (1) Assess the association between the B-mode morphologic appearance and elasticity in the rotator cuff tendon using shear wave elastography (SWE). (2) Assess the association between SWE and symptoms.
  
  
  METHODS
  Institutional Review Board approval and informed consent were obtained. A retrospective review identified 21 studies in 19 eligible patients for whom SWE was performed during routine sonographic evaluations for shoulder pain. Evaluations were compared with 55 studies from 16 asymptomatic volunteers and 6 patients with asymptomatic contralateral shoulders. Repeated studies were accounted for by resampling. Proximal and distal tendon morphologic characteristics were graded from 1 to 4 (normal to full-thickness tear), and average shear wave velocity (SWV) measurements were obtained at both locations. In 68 examinations, deltoid muscle SWV measurements were available for post hoc analysis.
  
  
  RESULTS
  The morphologic grade and SWV showed weak-to-moderate negative correlations in the proximal (P < .001) and distal (P = .002) rotator cuff tendon. A weakly significant SWV decrease was found in the proximal tendon in symptomatic patients (P = .049); no significant difference was seen in the distal tendon. The deltoid muscle SWV showed weak-to-moderate negative correlations with the morphologic grade in the proximal (P = .004) and distal (P = .007) tendon; the deltoid SWV was also significantly lower in symptomatic shoulders (P = .001).
  
  
  CONCLUSIONS
  Shear wave elastography shows tendon softening in rotator cuff disease. It captures information not obtained by a morphologic evaluation alone; however, a poor correlation with symptoms suggests that SWE will be less useful in workups for shoulder pain than for preoperative assessments of tendon quality. Deltoid muscle softening seen in morphologically abnormal and symptomatic patients requires further exploration.
authors.affiliation: New York University Langone Medical Center, New York, New York, USA.
authors.forename: Stephanie W
authors.initials: SW
authors.lastname: Hou
authors.affiliation: New York University Langone Medical Center, New York, New York, USA.
authors.forename: Alexander N
authors.initials: AN
authors.lastname: Merkle
authors.affiliation: New York University Langone Medical Center, New York, New York, USA.
authors.forename: James S
authors.initials: JS
authors.lastname: Babb
authors.affiliation: New York University Langone Medical Center, New York, New York, USA.
authors.forename: Robert
authors.initials: R
authors.lastname: McCabe
authors.affiliation: New York University Langone Medical Center, New York, New York, USA.
authors.forename: Soterios
authors.initials: S
authors.lastname: Gyftopoulos
authors.affiliation: New York University Langone Medical Center, New York, New York, USA.
authors.forename: Ronald S
authors.initials: RS
authors.lastname: Adler
mesh_terms: D000328:Adult; D000368:Aged; D054459:Elasticity Imaging Techniques / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012189:Retrospective Studies; D017006:Rotator Cuff / Q000000981:diagnostic imaging*; D000070636:Rotator Cuff Injuries / Q000150:complications / Q000000981:diagnostic imaging*; D020069:Shoulder Pain / Q000209:etiology; D055815:Young Adult
keywords: elastography; musculoskeletal ultrasound; rotator cuff; shear wave; shoulder; sonography; tendon