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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

.871a

 

>0.25 mm

.538

.623

n/a

n/a

Histiocyte cuff thickness

>0 mm

.586

.467

n/a

n/a

≥1 mm

.523

.606

.736

.687

Surface necrosis

Grade II-IV

.551

.688

.709

.829a

 

Grade III-IV

.529

.621

.820

.807

 

Grade IV

.638

.582

.85

.95

Particle load

Grade 1–4

.536

.618

.638

.895a

 

Grade 2–4

.492

.571

.552

.625

 

Grade 3–4

.480

.489

.495

.551

 

Grade 4

.496

.504

.588

.677

  1. 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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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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