Description
Title
Comparison of neutral and external rotation effect on ischiofemoral distance between cadaveric study and fluoroscopic examination
Abstract
Purpose: To determine the effect of hip external rotation or extension/adduction on minimizing the ischiofemoral distance (IFD) and assess the correlation between cadaveric and fluoroscopic IFD measurements in difference hip positions.
Methods: This cadaveric study involved 33 hip joints from 17 embalmed cadavers. IFD, the distance between the lesser trochanter and lateral ischium, was measured in different hip positions: neutral, external rotation at 30° and external rotation at 60° with the hip in both neutral extension and adduction as well as 10° hip extension and 10° hip adduction. Difference in IFD related to positions and correlation between cadaveric and fluoroscopic measurement were analyzed.
Results: IFD measurements showed that the greatest reduction occurred at 60° of external hip rotation, with a significant difference observed only between neutral and 60° external rotation in cadaveric groups (7.60±4.68 vs 5.05±3.48, 95% CI, 0.14 to 4.96; p=0.036). No substantial difference was observed between extension and adduction positions . Positive correlations were observed between cadaveric and fluoroscopic measurements, especially in the neutral position (r=0.492, p=0.004), external rotation at 30° (r=0.52, p=0.002), external rotation at 60° (r=0.419, p=0.015), and the extension/adduction positions combined with neutral rotation (r=0.396, p=0.023).
Conclusion: The IFD significantly decreased with increasing degrees of hip external rotation, particularly at 60°. No significant reduction was observed in the extension/adduction positions. Additionally, positive correlations were observed between cadaveric and fluoroscopic
