日直視下腱板断裂術後の経時的なMRI評価−術後1年以内と1年以降における修復腱の比較検討−

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The purpose of this study is to investigate postoperative changes of MRI findings after the open rotator cuff repair within 1 year and over 1 year. 76 shoulders, which received the open repair by a trans-osseous method and acromioplasty, were evaluated with MRI postoperatively within 1 year and over 1 year. 37 males and 35 females were involved. The average age at the time of operation was 65.1 years old. The average follow-up period was 31.7 months. The clinical outcome was evaluated by JOA score. MRI was performed on a 0.5-T system and T2-weighted images were obtained. Intensity of the tendon or the bone-tendon interface is defined as high when it is as high as joint fluid, as low when it was the same as the normal tendon, and as medium when it was between high and low. At final follow-up, of 19 shoulders which showed low intensity within 1 year, 18 shoulders (94.7%) showed low intensity continuously. Of 30 shoulders which showed medium intensity within 1 year, 24 (80.0%) changed to low intensity at an average of 18.8 months after repair. Of 27 shoulders which showed high intensity within 1 year, 5 shoulders (18.5%) changed to low intensity at an average of 34.6 months after repair. The average postoperative JOA score of low intensity was 93.4 at final follow-up, and it was significantly higher than that of high intensity (81.1). Therefore, it is suggested that medium intensity of the repaired tendon has a hope of meaning a biological-repair at high rate within 2 years, and high intensity within 3 years after the operation does not always mean a re-rupture.

日直視下腱板断裂術後の経時的なMRI評価−術後1年以内と1年以降における修復腱の比較検討−

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