BMC Musculoskeletal Disorders

Table 4 AUCs for ordinal observations with all possible predictive values

From: Diagnostic utility of joint fluid metal ion measurement for histopathological findings in metal-on-metal hip replacements

		THA		Hip resurfacing
Observation	Predictive value	Joint fluid Chrome AUC	Joint fluid Cobalt AUC	Joint fluid Chrome AUC	Joint fluid Cobalt AUC
Lymphocyte cuff thickness	>0 mm	.549	.476	.817	.871^a
	>0.25 mm	.538	.623	n/a	n/a
Histiocyte cuff thickness	>0 mm	.586	.467	n/a	n/a
Histiocyte cuff thickness	≥1 mm	.523	.606	.736	.687
Surface necrosis	Grade II-IV	.551	.688	.709	.829^a
	Grade III-IV	.529	.621	.820	.807
	Grade IV	.638	.582	.85	.95
Particle load	Grade 1–4	.536	.618	.638	.895^a
	Grade 2–4	.492	.571	.552	.625
	Grade 3–4	.480	.489	.495	.551
	Grade 4	.496	.504	.588	.677

n/a assessment of AUC not possible due to inadequate number of controls and cases, see Table 1. ^a = significantly different from AUC = .5, see Figs. 2 and 3

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