A Geometric Model to Determine Patient-Specific Cup Anteversion Based on Pelvic Motion in Total Hip Arthroplasty

Figure 5

Screenshots of the “SafeTHA” app for Apple™ iOS mobile software that provides the user with calculated functional anteversions based on inputted desired planned inclination and anteversion, patient-specific measured standing, sitting, and change in, pelvic tilt using the mathematical relationship presented in this study. The average population-based functional anteversions are also calculated with the same planned cup position and equation. (a) The final output (boxed yellow number) is the resultant recommended new intra-operative anteversion based on these calculations and the presented algorithm. (b) Additional specifics regarding patient’s anteversions compared to averages are also presented.

(a)

(b)