Investigating the reliability and validity of subacromial space measurements using ultrasound and MRI

Table 1 Intraclass correlation coefficients [95% confidence interval], post hoc power (p²) and mean differences (standard deviation) between MRI and Ultrasound

		MRI_Hum10			MRI_Lat
		ICC [95% CI]	Mean Difference (Standard deviation) (mm)	Power (p2)	ICC [95% CI]	Mean Difference (Standard deviation) (mm)	Power (p2)
Ultrasound—novice	Seated	0.21 [0.0–0.58]	3.29 (1.62)	0.14	0.27 [0.0–0.62]	2.56 (1.22)	0.21
	Supine	0.23 [0.0–0.60]	3.01 (1.48)	0.16	0.34 [0.0–0.68]	2.11 (1.30)	0.31
	Expert Angle	0.25 [0.0–0.60]	3.02 (1.49)	0.18	0.23 [0.0–0.59]	2.52 (1.25)	0.16
Ultrasound—expert	Seated	0.36 [0.0–0.70]	2.21 (1.09)	0.34	0.45 [0.0–0.75]	1.53 (1.08)	0.52
	Supine	0.49 [0.0–0.80]	1.72 (0.99)	0.60	0.46 [0.1–0.86]	1.46 (0.85)	0.54

Results are presented by raters (expert, novice), body positions (seated, supine) and MRI processing method (MRI_Hum10, MRI_Lat). The novice rater capturing measurements at the expert’s transducer angle is also presented. Mean differences = absolute difference (US–MRI) mm

ISSN: 1749-799X