Table 2

Clinical examination versus US as the “gold standard”. Data showing sensitivity, specificity, false positive (FPR) and false negative rate (FNR), positive (PPV) and negative predictive value (NPR). Results are shown as percentages

SensitivitySpecificityFPRFNRPPVNPR
Total22.679.720.377.458.744.7
Superior pole of the patella29.775.824.270.357.949.0
Inferior pole of the patella22.572.427.677.552.940.4
Tibial tuberosity18.288.012.081.872.737.9
Superior pole of the calcaneus22.279.420.677.853.349.1
Inferior pole of the calcaneus26.784.415.679.061.547.4