Initial assessment of femoral proximal fracture and acute hip arthritis using pocket-sized ultrasound: a prospective observational study in a primary care setting in Japan

Table 2 Diagnostic accuracy of ultrasound findings for femoral proximal fracture and acute hip arthritis

US findings	Diagnosis	Sn (95% CI)	Sp (95% CI)	PPV (95% CI)	NPV (95% CI)
Cortical discontinuity	Femoral proximal fracture	0.96 (0.80–1.00)	0.92 (0.74–0.99)	0.93 (0.76–0.99)	0.96 (0.80–1.00)
Joint fluid retention	Femoral proximal fracture	0.62 (0.41–0.80)	0.77 (0.56–0.91)	0.73 (0.50–0.89)	0.67 (0.47–0.83)
Joint fluid retention	Acute hip arthritis	1.00 (0.42–1.00)	0.65 (0.50–0.79)	0.27 (0.11–0.50)	1.00 (0.83–1.00)
Cortical discontinuity or joint fluid retention	Femoral proximal fracture or acute hip arthritis	0.97 (0.84–1.00)	0.90 (0.68–0.99)	0.94 (0.80–0.99)	0.95(0.74–1.00)

US ultrasound, Sn sensitivity, Sp specificity, PPV positive predictive value, NPV negative predictive value, CI confidence interval

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