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Table 2 Segmental volume and thickness ratios in subscapularis, infraspinatus and deltoid muscle of the affected shoulder.

From: An MRI study on the relations between muscle atrophy, shoulder function and glenohumeral deformity in shoulders of children with obstetric brachial plexus injury

  Subscapularis muscle Infraspinatus muscle Deltoid muscle
  Mean Range Mean Range Mean Range
Volume Ratio 50.7% ± 14.9%* 20.8% to 77.7% 61.4% ± 18.0%* 34.7% to 106.3% 76.3% ± 14.8%* 51.2% to 110.3%
Thickness Ratio 62.0% ± 16.0%** 28.3% to 87.5% 70.7% ± 17.1%** 45.0% to 106.7% - -
  1. Values are given as mean ± SD with their range. * Differences between subscapularis, infraspinatus and deltoid volume ratios was significant: p < 0.01. ** Difference between subscapularis and infraspinatus thickness ratios was significant: p < 0.05.