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

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

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

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.
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.
**p ≤ 0.05

ISSN: 1471-2474