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Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 21, Issue 7, pp 1593–1597 | Cite as

Learning curve of office-based ultrasonography for rotator cuff tendons tears

  • Ji-Hoon Ok
  • Yang-Soo KimEmail author
  • Jung-Man Kim
  • Tae-Wook Yoo
Shoulder

Abstract

Purpose

To compare the accuracy of ultrasonography and MR arthrography (MRA) imaging in detecting of rotator cuff tears with arthroscopic finding used as the reference standard.

Methods

The ultrasonography and MRA findings of 51 shoulders that underwent the arthroscopic surgery were prospectively analysed. Two orthopaedic doctors independently performed ultrasonography and interpreted the findings at the office. The tear size measured at ultrasonography and MRA was compared with the size measured at surgery using Pearson correlation coefficients (r). The sensitivity, specificity, accuracy, positive predictive value, negative predictive value and false-positive rate were calculated for a diagnosis of partial-and full-thickness rotator cuff tears. The kappa coefficient was calculated to verify the inter-observer agreement.

Results

The sensitivity of ultrasonography and MRA for detecting partial-thickness tears was 45.5 and 72.7 %, and that for full-thickness tears was 80.0 and 100 %, respectively. The accuracy of ultrasonograpy and MRA for detecting partial-thickness tears was 45.1 and 88.2 %, and that for full-thickness tears was 82.4 and 98 %, respectively. Tear size measured based on ultrasonography examination showed a poor correlation with the size measured at arthroscopic surgery (r = 0.21; p < 0.05). However, tear size estimated by MRA showed a strong correlation (r = 0.75; p < 0.05). The kappa coefficient was 0.47 between the two independent examiners.

Conclusions

The accuracy of office-based ultrasonography for beginner orthopaedic surgeons to detect full-thickness rotator cuff tears was comparable to that of MRA but was less accurate for detecting partial-thickness tears and torn size measurement. Inter-observer agreement on the interpretation was fair. These results highlight the importance of the correct technique and experience in operation of ultrasonography in shoulder joint.

Level of evidence

Diagnostic study, Level II.

Keywords

Rotator cuff tear Ultrasonography Accuracy Partial tear 

Notes

Conflict of interest

There was no external funding source in this investigation.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Ji-Hoon Ok
    • 1
  • Yang-Soo Kim
    • 1
    Email author
  • Jung-Man Kim
    • 2
  • Tae-Wook Yoo
    • 1
  1. 1.Department of Orthopedic Surgery, Seoul St. Mary’s Hospital, College of MedicineThe Catholic University of KoreaSeoulKorea
  2. 2.Orthopaedic DepartmentBumin HospitalSeoulKorea

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