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

Table 5 AUCs for ALVAL-scores with all possible predictive values

		THA		Hip resurfacing
ALVAL-score as predictive value		Joint fluid chrome AUC	Joint fluid cobalt AUC	Joint fluid chrome AUC	Joint fluid cobalt AUC
≥4	Low	.633	.649	.823	.867
≥5	Moderate	.709^a	.620	.829	.821
≥6		.511	.593	.813	.781
≥7		.546	.479	.867^a	.852^a
≥8		.575	.510	n/a	n/a
≥9	High	.597	.478	n/a	n/a

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. 1 and 2

ISSN: 1471-2474