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Table 1 Characteristics of ARC associated parameters according to STSL and SSN types

From: New parameters describing morphological variations in the suprascapular notch region as potential predictors of suprascapular nerve entrapment

Parameters of area reduction STSL SSN type
Fan-type Band-type IA IB IC II IIIA IIIB IIIC IV V
Number 56 44 2 1 2 11 6 13 59 3 3
aSSN [mm2] Mean 119.1 93.66 140.7 240 109.75 100.1 111.4 130.1 103.35 106.71 43.2
SD 42.3 31.17 76.01 - 7.42 27.7 28.87 47.98 34.02 17.62 29
p 0.0032 0.0556
aSTSL [mm2] Mean 76.8 65.3 94.3 172 78.1 67.9 77.6 78.23 68.38 91.37 34.6
SD 28.12 23 10.3 - 17.68 26.09 13.36 31.55 22.52 6.86 24.23
p 0.05887 0.0261
aACSL [mm2]* Mean 9.03 10.12 18.2 - 11.3 11.59 - 11.39 9.2 - -
SD 8.69 6.63 - - 1.84 7.31 - 9.02 7.32 - -
p 0.1996 0.3423
aSSO [mm2] Mean 38.56 23.9 41.95 64 21.85 26.89 32.17 47.21 31.1 13.17 9.1
SD 22.32 16.33 59.3 - 9.4 14.5 18.97 28.67 17.96 8.58 6.99
p 0.0004 0.1395
SN passage area [mm2] Mean 36.84 20.86 36.5 64 7.8 22.78 32.17 43.8 29.5 13.17 7.8
SD 21.89 15.46 51.2 - 3.96 13.22 18.97 30.6 17.2 8.58 5.35
p 0.00017 0.0306
ARCSTSL [%] Mean 65.3 70.9 76.1 71.7 70.8 67.3 71.6 61.1 67.2 86.5 74.2
SD 10.7 13.8 33.8 - 11.3 13.4 12.8 11.3 11.5 8.3 1.1
p 0.0274 0.1526
ARCACSL [%]* Mean 7.9 10.2 9.4 - 10.3 12.6 - 10.5 8.5 - -
SD 8.2 7 - - 1 8.5 - 8.3 7.3 - -
p 0.2947 0.0489
ARC [%] Mean 68.6 77.6 80.8 71.7 81.0 78.1 71.6 67.6 70.8 86.5 86.6
SD 10.5 12.5 27.2 - 12.3 14.3 12.8 11.3 10.8 8.3 11.2
p 0.00002 0.0966
  1. *When ACSL present.
  2. No differences in post-hoc test.
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