European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2026
Postoperative infraspinatus contractility is associated with acromiohumeral distance after arthroscopic rotator cuff repair.
СтатьяНазвание и аннотация: Перевод в очереди
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Oishi Ryuta, Mura Nariyuki, Hoshikawa Kyosuke, Uno Tomohiro, Yuki Issei, Satake Hiroshi, Takakubo Yuya, Takagi Michiaki
Аннотация
OBJECTIVE: To investigate whether infraspinatus muscle contractility improves following arthroscopic rotator cuff repair (ARCR) and its impact on postoperative acromiohumeral distance (AHD).
METHODS: In this prospective case series, 61 shoulders with posterosuperior rotator cuff tears involving at least a full-thickness supraspinatus tear, with or without extension into the infraspinatus tendon (mean age: 66.4 ± 7.7 years; 31 men, 30 women) were followed for 1 year after ARCR. Shoulders with subscapularis tears or re-tears were excluded. Muscle contractility was measured using real-time tissue elastography (activity value = elasticity difference between rest and contraction), while AHD was assessed radiographically at 0° and 60° abduction.
RESULTS: The infraspinatus activity value increased significantly (0.52 ± 0.25 to 0.76 ± 0.28; p < 0.05) and showed positive correlations with AHD at 0° (r = 0.424, p < 0.05) and 60° abduction (r = 0.587, p < 0.05), with postoperative AHD increasing by approximately 1 mm at both angles at 1 year. Supraspinatus muscle contractility demonstrated no significant correlations. In the multivariable regression analysis, the infraspinatus activity value and its Goutallier grade were independently associated with postoperative AHD.
CONCLUSION: Improvement in infraspinatus muscle contractility was associated with postoperative AHD, suggesting a potential role of infraspinatus function in postoperative glenohumeral mechanics.
METHODS: In this prospective case series, 61 shoulders with posterosuperior rotator cuff tears involving at least a full-thickness supraspinatus tear, with or without extension into the infraspinatus tendon (mean age: 66.4 ± 7.7 years; 31 men, 30 women) were followed for 1 year after ARCR. Shoulders with subscapularis tears or re-tears were excluded. Muscle contractility was measured using real-time tissue elastography (activity value = elasticity difference between rest and contraction), while AHD was assessed radiographically at 0° and 60° abduction.
RESULTS: The infraspinatus activity value increased significantly (0.52 ± 0.25 to 0.76 ± 0.28; p < 0.05) and showed positive correlations with AHD at 0° (r = 0.424, p < 0.05) and 60° abduction (r = 0.587, p < 0.05), with postoperative AHD increasing by approximately 1 mm at both angles at 1 year. Supraspinatus muscle contractility demonstrated no significant correlations. In the multivariable regression analysis, the infraspinatus activity value and its Goutallier grade were independently associated with postoperative AHD.
CONCLUSION: Improvement in infraspinatus muscle contractility was associated with postoperative AHD, suggesting a potential role of infraspinatus function in postoperative glenohumeral mechanics.