Clinics in Shoulder and Elbow

대한견·주관절의학회 (Korean Shoulder and Elbow Society)
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Posterior decentering of the humeral head in patients with arthroscopic rotator cuff repair

  • Nakamura, Hidehiro (Department of Orthopedic Surgery, Kurume University Medical Center) ;
  • Gotoh, Masafumi (Department of Orthopedic Surgery, Kurume University Medical Center) ;
  • Honda, Hirokazu (Department of Orthopedic Surgery, Kurume University Medical Center) ;
  • Mitsui, Yasuhiro (Department of Orthopedic Surgery, Kurume University Medical Center) ;
  • Ohzono, Hiroki (Department of Orthopedic Surgery, Kurume University Medical Center) ;
  • Shiba, Naoto (Department of Orthopedic Surgery, Kurume University) ;
  • Kume, Shinichiro (Department of Orthopedic Surgery, Kurume University Medical Center) ;
  • Okawa, Takahiro (Department of Orthopedic Surgery, Kurume University Medical Center)
  • 투고 : 2021.09.21
  • 심사 : 2021.11.26
  • 발행 : 2022.03.01
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초록

Background: In some patients with rotator cuff tear (RCT), the axial view of magnetic resonance imaging (MRI) shows subtle posterior decentering (PD) of the humeral head from the glenoid fossa. This is considered to result from a loss of centralization that is typically produced by rotator cuff function. There are few reports on PD in RCT despite the common occurrence of posterior subluxation in degenerative joint disease. In this study, we investigated the effect of PD in arthroscopic rotator cuff repair (ARCR). Methods: We conducted a retrospective study of consecutive patients who underwent ARCR at our institute and were followed-up for at least 1 year. PD was identified as a 2-mm posterior shift of the humeral head relative to the glenoid fossa in the axial MRI view preoperatively. The tear size and fatty degeneration (FD, Goutallier classification) were also evaluated using preoperative MRI. Retears were evaluated through MRI at 1 year postoperatively. Results: We included 135 shoulders in this study. Ten instances of PD (including seven retears) were observed preoperatively. Fifteen retears (three and 12 retears in the small/medium and large/massive tear groups, respectively) were observed postoperatively. PD was significantly correlated with tear size, FD, and retear occurrence (p<0.01 each). The odds ratio for PD in retears was 34.1, which was greater than that for tear size ≥3 cm and FD grade ≥3. Conclusions: We concluded that large tear size and FD contribute to the occurrence of PD. Furthermore, PD could be a predictor of retear after ARCR.

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과제정보

We would like to thank for Kenichiro Eshima and Yousuke Nakamura who gave us clinical support.

참고문헌

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