Observational studyEuropean journal of orthopaedic surgery & traumatology : orthopedie traumatologie2026
Postoperative infraspinatus contractility is associated with acromiohumeral distance after arthroscopic rotator cuff repair.
Observational study in European journal of orthopaedic surgery & traumatology : orthopedie traumatologie, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveTo investigate whether infraspinatus muscle contractility improves following arthroscopic rotator cuff repair (ARCR) and its impact on postoperative acromiohumeral distance (AHD).
methodsIn 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.
resultsThe 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.
conclusionImprovement in infraspinatus muscle contractility was associated with postoperative AHD, suggesting a potential role of infraspinatus function in postoperative glenohumeral mechanics.
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