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Table 3 Intraoperative and radiographic measurements for the two different cup orientation aids with the Stulberg positioner (an inclinometer was used in all patients with the Capello positioner) and for the two different positioners accounting for visual aid (inclinometer)

From: Cup orientation following posterior approach THA – the effect of different visual aids and pelvic supports

Parameter Inclinometer (n = 50) Mechanical alignment guide (n = 50) p-value Stulberg positioner (n = 50) Capello positioner (n = 50) p-value
Radiographic inclination 42° ± 6 42° ± 6 0.63 42° ± 6 39° ± 6 0.02
Radiographic anteversion 22° ± 5 23° ± 5 0.32 22° ± 6 22° ± 7 0.98
Optimum inclination (30°-50°) (n) 46 (92%) 46 (92%) 1.0 46 (92%) 46 (92%) 1.00
Optimum inclination and anteversion (n) 42 (84%) 44 (88%) 0.57 42 (84%) 40 (80%) 0.60
Intra-operative inclination (IOI) 37° ± 3 37° ± 3 32° ± 3 < 0.001
True operative cup inclination (TOI) 37° ± 5 38° ± 5 0.9 37° ± 5 36° ± 6 0.015
ΔPelvicPosition (= TOI – IOI) 0° ± 5 0° ± 5 3° ± 6 0.011
ΔDefinition (= RI – TOI) 4° ± 2 4° ± 2 4° ± 2 0.355