Diagnosis, preoperative evaluation, classification and total hip arthroplasty in patients with long-term unreduced hip joint dislocation, secondary osteoarthritis and pseudoarthrosis

Table 2 Diagnosis of patients with long-term unreduced hip joint dislocation, secondary osteoarthritis and pseudoarthrosis

	Only X-ray	X-ray + CT^a	X-ray + CT^a + 3D reconstruction
Sensitivity (95% CI)	18.8% (0–37.9%)^b	50.0% (25.5–74.5%)^c	93.8% (81.9–100%)
Specificity (95% CI)	98.9% (97.8–100%)	98.9% (97.8–100%)	99.6% (99.0–100%)
Accuracy (95% CI)	94.7% (94.3–95.0%)	96.3% (95.9–96.7%)	99.3% (99.1–99.5%)
Youden’s index	0.18	0.49	0.93
Intraclass correlation coefficient	0.21	0.69	0.95

CI confidence interval, CT computed tomography
^aAxial and coronal scanning
^b The sensitivity was significantly lower than that of “X-ray + CT + 3D reconstruction” (P < 0.001)
^c The sensitivity was significantly lower than that of “X-ray + CT + 3D reconstruction” (P = 0.016)

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