Summary of studies comparing ultrasound and MARS-MRI for detecting adverse reactions to metal debris and pseudotumors

			Positive	Negative
	Sensitivity	Specificity	predictive	predictive
Study (participants)	(%)	(%)	value (%)	value (%)
Garbuz et al. 2014 (40 hips)
Ultrasound vs. MARS-MRIa	100	96	92	100
MARS-MRI vs. ultrasounda	92	100	100	96
Siddiqui et al. 2014 (19 hips)
Ultrasound vs. MARS-MRa	69	83	90	56
Nishii et al. 2014 (64 hips)
Ultrasound vs. MARS-MRIa	74	92	NS	NS
Muraoka et al. 2015 (83 hips)
Ultrasound vs. MARS-MRIa	72	88	65	91
Kwon et al. 2016a (42 hips)
Initial: Ultrasound vs. MARS-MRIa	81	92	86	88
Repeat: Ultrasound vs. MARS-MRIa	86	88	75	94
Matharu et al. 2016e (40 hips)
Ultrasound vs. intraoperativea	91	43	88	50
MARS-MRI vs. intraoperativea	94	57	91	67
Combined imaging (ultrasound & MARS-MRI) vs. intraoperativea	100	57	92	100

NS = not stated.

^aGold reference standard for diagnostic test characteristics