title: Quantitative diagnostic method for biceps long head tendinitis by using ultrasound.
abstract: OBJECTIVE
  To investigate the feasibility of grayscale quantitative diagnostic method for biceps tendinitis and determine the cut-off points of a quantitative biceps ultrasound (US) method to diagnose biceps tendinitis. Design. Prospective cross-sectional case controlled study.
  
  
  METHODS
  Outpatient rehabilitation service.
  
  
  METHODS
  A total of 336 shoulder pain patients with suspected biceps tendinitis were recruited in this prospective observational study. The grayscale pixel data of the range of interest (ROI) were obtained for both the transverse and longitudinal views of the biceps US.
  
  
  RESULTS
  A total of 136 patients were classified with biceps tendinitis, and 200 patients were classified as not having biceps tendinitis based on the diagnostic criteria. Based on the Youden index, the cut-off points were determined as 26.85 for the transverse view and 21.25 for the longitudinal view of the standard deviation (StdDev) of the ROI values, respectively. When the ROI evaluation of the US surpassed the cut-off point, the sensitivity was 68% and the specificity was 90% in the StdDev of the transverse view, and the sensitivity was 81% and the specificity was 73% in the StdDev of the longitudinal view to diagnose biceps tendinitis.
  
  
  CONCLUSIONS
  For equivocal cases or inexperienced sonographers, our study provides a more objective method for diagnosing biceps tendinitis in shoulder pain patients.
authors.affiliation: Department of Physical Medicine and Rehabilitation, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan.
authors.forename: Shih-Wei
authors.initials: SW
authors.lastname: Huang
authors.affiliation: Department of Physical Medicine and Rehabilitation, Changhua Christian Hospital, No. 135 Nan-Hsiao Street, Changhua, Changhua 500, Taiwan.
authors.forename: Wei-Te
authors.initials: WT
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012372:ROC Curve; D016059:Range of Motion, Articular; D015203:Reproducibility of Results; D012307:Risk Factors; D017006:Rotator Cuff / Q000473:pathology*; D052256:Tendinopathy / Q000000981:diagnostic imaging*; D014463:Ultrasonography