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Table 3 Summary of imaging variables demonstrating association with positive anaesthetic response to diagnostic blocks (p ≤ 0.05 or OR >2.0)

From: A prospective study of shoulder pain in primary care: Prevalence of imaged pathology and response to guided diagnostic blocks

Pathology identified on imaging Pathology identified
(total cases) (n)
% with pathology present reporting PAR % with pathology absent reporting PAR OR
(95% CI)
Fishers test
(p value)
SAB injection (PAR n = 66)      
X-ray: type 3 acromion 4 75 33 6.2 (0.64, 61.23) 0.109
X-ray: os acromiale 4 75 33 6.1 (0.63, 60.25) 0.112
X-ray: supraspinatus calcification 16 56 31 2.8 (1.00, 7.97) 0.054
US: supraspinatus calcification 33 49 31 2.1 (1.00, 4.55) 0.068
US: supraspinatus FTT 10 70** 32 5.0 (1.25, 20.11) 0.033
ACJ injection (PAR n = 22)      
X-ray: ACJ pathology 21 14 16 2.1 (0.69, 6.52) 0.189
US: supraspinatus tear PTT (articular surface) 8 0 17 2.1 (0.39, 11.05) 0.323
US: LHB tendinosis 3 0 16 3.1 (0.27, 35.39) 0.374
GHJ injection (PAR n = 12)      
US: no rotator cuff tear 19 21** 0 1.3 (1.11, 1.46) 0.029
US: supraspinatus tendinosis 11 27 14 2.3 (0.51, 10.30) 0.374
US: subscapularis tendinosis 3 33 15 2.8 (0.23, 33.27) 0.421
US: biceps tendon sheath effusion 13 46** 10 8.0 (2.02, 31.72) 0.004
MRA: ACJ pathology 46 20 11 2.0 (0.50, 8.23) 0.516
MRA: osteolysis lateral clavicle 5 40 15 3.9 (0.58, 26.58) 0.187
MRA: contrast seen in SAB 6 33 15 2.9 (0.47, 17.99) 0.254
  1. Abbreviations: PAR, positive anaesthetic response (≥80% post-injection pain intensity reduction); OR, adjusted odds ratio; CI, confidence interval; SAB, subacromial bursa; US, ultrasound; FTT, full thickness tear; ACJ, acromioclavicular joint; PTT, partial thickness tear; LHB, long head of biceps; GHJ, glenohumeral joint; MRA, magnetic resonance arthrogram.
  2. Percentages do not total 100% as these represent proportion of subjects with or without pathology on imaging (row percentages in contingency table) in the PAR group. Negative anaesthetic response group results (column percentages) are not presented.
  3. **p ≤ 0.05