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Comparison study of indirect MR arthrography and direct MR arthrography of the shoulder

Jee Young Jung1, Young Cheol Yoon, Sang-Kyu Yi

  • 1Department of Radiology, Samsung Medical Center, School of Medicine, Sungkyunkwan University, 50 Ilwon-dong, Kangnam-ku, Seoul 135-710, Republic of Korea.

Skeletal Radiology
|February 20, 2009
PubMed
Abstract

Insights

Indirect MR arthrography (I-MRA) and direct MR arthrography (D-MRA) show similar diagnostic value for labral tears, rotator cuff tears, and biceps tendon tears. Both methods offer comparable sensitivity and specificity in detecting these shoulder pathologies.

Area of Science:

  • Orthopedic imaging
  • Diagnostic radiology
  • Musculoskeletal MRI

Background:

  • Shoulder injuries, including labral tears, rotator cuff tears, and long head of biceps tendon (LHBT) tears, are common causes of shoulder pain and dysfunction.
  • Accurate diagnosis is crucial for effective treatment planning and patient outcomes.
  • Magnetic resonance arthrography (MRA) is a valuable tool for evaluating intra-articular shoulder pathologies.

Purpose of the Study:

  • To compare the diagnostic accuracy of indirect MR arthrography (I-MRA) versus direct MR arthrography (D-MRA) for detecting labral tears, rotator cuff tears, and LHBT tears.
  • To assess the sensitivity and specificity of both I-MRA and D-MRA techniques.
  • To evaluate inter-observer agreement for both imaging modalities.

Main Methods:

  • A prospective study involving 19 patients who underwent both I-MRA and D-MRA prior to arthroscopic surgery.
  • Standardized MRI sequences (T1-weighted fat-saturated, T2-weighted) were utilized for both techniques.
  • Two independent radiologists retrospectively reviewed all MRA scans, comparing findings to arthroscopic surgery results as the gold standard.

Main Results:

  • Both I-MRA and D-MRA demonstrated high sensitivity and specificity for diagnosing anterior labral tears and supraspinatus-infraspinatus tendon tears.
  • Sensitivity and specificity for superior labral tears, subscapularis tendon tears, and LHBT tears were comparable between I-MRA and D-MRA across both readers.
  • Inter-observer agreement was moderate to substantial (kappa > 0.41) for both imaging techniques, indicating good reproducibility.

Conclusions:

  • No statistically significant difference was found in the diagnostic performance between I-MRA and D-MRA for evaluating labral tears, rotator cuff tears, and LHBT tears.
  • Both indirect and direct MR arthrography are effective imaging modalities for diagnosing common shoulder pathologies.
  • The choice between I-MRA and D-MRA may depend on specific clinical scenarios and institutional preferences.

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