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KMID : 1037920150020020071
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Arthroscopy and Orthopedic Sports Medicine
2015 Volume.2 No. 2 p.71 ~ p.76
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Ancillary signs of subscapularis tendon tear in magnetic resonance arthrography
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Shin Sang-Wook
Ryu Jeong-Ah
Kim Seung-Hyun
Park Tae-Soo
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Abstract
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Background: This study assessed the correlation of ancillary magnetic resonance (MR) arthrographic signs and the presence of subscapularis tendon tears.
Methods: Thirty-two consecutive patients who presented with chronic shoulder pain between December 2010 and September 2011 were evaluated using MR arthroscopy and arthroscopy. Arthroscopically, we confirmed that 8 patients sustained a subscapularis tendon tear and 32 did not. Through MR arthroscopy on all the shoulders, we assessed for (1) subluxation, dislocation, or tear of the long head of biceps tendon, (2) tear of the supraspinatus or the infraspinatus tendon, and (3) fatty degeneration of the supraspinatus or the infraspinatus muscle. The MR arthrograms were reviewed by two radiologists who had no prior knowledge of the patient’s medical history for the presence or absence of these MR arthrographic signs. These ancillary signs were correlated to arthroscopically diagnosed subscapularis tears.
Results: We found that fatty degeneration of the subscapularis muscle was correlated with statistical significance to having a subscapularis tendon tear (P = 0.018). Subluxation or dislocation of the tendon of the long head of biceps brachii was also correlated but the correlation was not statistically significant. The two radiologists reached a substantial interobserver agreement (K > 0.6) in their assessment of all MR arthrographic signs except the subluxation/dislocation of long head of the biceps tendon (K = 0.59).
Conclusion: Fatty degeneration of the subscapularis muscle may be a useful ancillary sign when diagnosing subscapularis tendon tears.
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KEYWORD
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Shoulder, Subscapularis, Tear, Magnetic resonance arthrography, Arthroscopy
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