Appendix. Additional Radiographic Examination Related Descriptors

Appendix. Additional radiographic examination related descriptors

Alpha Angle Descriptors meeting consensus as a helpful component for the diagnosis of FAIS / Consensus met, Support (%)
Alpha angle > 550 on 450 Dunn radiograph (n=44) / 79.5
Alpha angle > 550 on Cross-table lateral radiograph (n=43) / 79.1
Alpha angle > 550 on Frog leg lateral radiograph (n=43) / 83.7
Alpha angle > 550 on MRI at 1.5 T (n=44) / 81.8
Alpha angle > 550 on MRI at 3.0 T (n=44) / 81.8
Alpha angle > 550 on MRA at 1.5 T (n=43) / 76.8
Alpha angle > 550 on MRA at 3.0 T (n=43) / 76.8
Alpha angle > 550 on MRI with radial sequences (n=44) / 84.1
Alpha angle > 550 on MRA with radial sequences (n=43) / 79.1
Alpha angle > 550 on CT (n=43) / 81.4
Alpha angle > 550 on CT with radial sequences (n=43) / 83.7
Alpha angle > 600 on AP Pelvic radiograph (n=44) / 84.1
Alpha angle > 600 on 450 Dunn radiograph (n=44) / 90.9
Alpha angle > 600 on Cross-table lateral radiograph (n=44) / 90.7
Alpha angle > 600 on Frog leg lateral radiograph (n=43) / 93
Alpha angle > 600 on MRI at 1.5 T (n=44) / 90.9
Alpha angle > 600 on MRI at 3.0 T (n=44) / 93.2
Alpha angle > 600 on MRA at 1.5 T (n=43) / 88.4
Alpha angle > 600 on MRA at 3.0 T (n=43) / 88.4
Alpha angle > 600 on MRI with radial sequences (n=44) / 93.2
Alpha angle > 600 on MRA with radial sequences (n=43) / 90.7
Alpha angle > 600 on CT (n=43) / 93
Alpha angle > 600 on CT with radial sequences (n=43) / 93
Alpha angle > 650 on AP Pelvic radiograph (n=44) / 93.2
Alpha angle > 650 on 45º Dunn radiograph (n=44) / 93.2
Alpha angle > 650 on Cross-table lateral radiograph (n=43) / 93
Alpha angle > 650 on Frog leg lateral radiograph (n=43) / 93
Alpha angle > 650 on MRI at 1.5 T (n=44) / 93.2
Alpha angle > 650 on MRI at 3.0 T (n=44) / 93.2
Alpha angle > 650 on MRA at 1.5 T (n=42) / 92.9
Alpha angle > 650 on MRA at 3.0 T (n=43) / 90.7
Alpha angle > 650 on MRI with radial sequences (n=44) / 93.2
Alpha angle > 650 on MRA with radial sequences (n=42) / 90.5
Alpha angle > 650 on CT (n=43) / 93
Alpha angle > 650 on CT with radial sequences (n=43) / 93
Alpha angle > 830 on AP Pelvic radiograph (n=44) / 88.6
Alpha angle > 830 on 450 Dunn radiograph (n=44) / 88.6
Alpha angle > 830 on Cross-table lateral radiograph (n=43) / 90.7
Alpha angle > 830 on Frog leg lateral radiograph (n=43) / 90.7
Alpha angle > 830 on MRI at 1.5 T (n= 44) / 90.9
Alpha angle > 830 on MRI at 3.0 T (n=44) / 90.9
Alpha angle > 830 on MRA at 1.5 T (n=43) / 86
Alpha angle > 830 on MRA at 3.0 T (n=43) / 86.1
Alpha angle > 830 on MRI with radial sequences (n=44) / 90.9
Alpha angle > 830 on MRA with radial sequences (n=43) / 86.1
Alpha angle > 830 on CT (n=43) / 90.7
Alpha angle > 830 on CT with radial sequences (n=43) / 90.7
Descriptors not meeting consensus as a helpful component for the diagnosis of FAIS / Consensus not met (%)
Radiographic imaging alone is sufficient without use of MRI or CT for diagnosis of FAIS (n=43) / 58.1
MRI and/or CT is necessary regardless of radiographic findings if clinical suspicion is high for FAIS (n=43) / 44.2
MRI and/or CT is necessary only when radiographic findings are inconclusive and clinical suspicion is high for FAIS (n=43) / 30.2
Descriptors meeting consensus as not being a helpful component for the diagnosis if FAIS / Consensus met, Non-Support (%)
No alpha angle measurement, regardless of imaging modality (and despite
positive subjective and clinical examination) is relevant for diagnosis of FAIS (n=41) / 81.81

FAIS=femoroacetabular syndrome, %=percent, MRI=magnetic resonance imaging, MRA=magnetic resonance arthrogram, CT=computed tomography, T=tesla, AP=anterior-posterior