THA Acetabular Anatomy Measuring And Grinding Depth Biomechanical Study

Objective: by measuring the center of acetabulum to bilateral obturator flange connection of vertical distance, study center of acetabulum to bilateral obturator flange connection is a constant vertical distance; Through different depth acetabulum burnish, install the acetabulum prosthesis, mechanics of in vitro test, test under what depth acetabulum optimal initial stability, for total hip replacement in the acetabulum prosthesisplaced to provide experimental basis.Methods: select20embalmed adult pelvis specimens, the10men and women. Openthe acetabulum, remove the soft tissue around the acetabular fossa ovalis, exposure, det ermine the acetabular longest diameter of AB and the shortest path CD, they intersect at point O ’, into the acetabulum center point O point O’ in the vertical projectionpoint of acetabulum, as the vertical edge line perpendicular to the sides of the obturator on O the point of intersection point, E, OEO in the plane ’. After due to bit line andacetabular point E F OE numerical calculation, measurement, the percentage of OE/EF; and4male adult antiseptic specimens, exposed acetabular side by total hip replacement requirements, respectively (position1) grinding part of hip the acetabular cartilage,(position2) completely polished to cartilage, subchondral bone (3) and (4) medial wall just wear4position installation Phi50, Phi52, Phi54acetabular components, mechanical test and statistical analysis in vitro.Results:1, male acetabular side OE measurements with no statistical difference (P>0.05), female acetabular side OE measurements with no statistical difference (P>0.05).2men, women, the percentage of OE/EF was no significant difference (P>0.05). Thevertical distance from the OE3, male acetabular center point to the sides of the upperedge of the cell line:(36.88±3.40) mm, the vertical distance OE female acetabular centre to the sides of the upper edge of the cell line:(33.34±1.74) mm.3, male, female acetabular centre to bilateral obturator line distance of acetabulum to bilateral obturator line distance of59.14±0.022%. Male, female, no significant difference (P>0.05).4, in the Polish part of acetabular cartilage of acetabular prosthesis position whenthe maximum compressive load is85.25N, the average compression load is83.50N,the maximum displacement is2.10mm, the average displacement is1.88mm; in theacetabular cartilage completely polished completely acetabular prosthesis position when the maximum compressive load is140.00N, the average compression load is136.50N, the maximum displacement is3.20mm, the average displacement is2.98mm; inthe acetabular subchondral bone position in the maximum compressive load is440,the average compressive load is435.60N, the maximum displacement is4.09mm, theaverage displacement is3.86mm; in the medial wall just wear of acetabular prosthesisposition of the maximum compressive load is459.00N the average compressive load,448.50N, the maximum displacement is4.40mm, the average displacement4.26mm.5, Phi50, Phi52and phi54acetabular components in the same position compressionload and displacement with no statistical difference (P>0.05); the same position of thesame acetabular components in pelvic specimens lateral acetabular compressive load,torque and the contact surface stiffness has no obvious statistical difference (P>0.05).6, position1and position2,3,4,3and4compared with the position location compared, compression load, torque and the contact surface stiffness has no obvious statistical difference (P>0.05); position2and position3, compared to4, there was a significant difference in compressive load, torque and the contact surface stiffness (P<0.05).6, in the subchondral bone position Phi50acetabulum file away in acetabular,Phi50, Phi52and phi54acetabular components, the acetabular component, a compressive load torque and the contact surface stiffness has no obvious statistical difference (P>0.05);3acetabular components in pelvic specimens of left and right sidetest data with no statistical difference (P>0.05).Conclusion: the vertical distance of OE1, male acetabular center point to the sides ofthe upper edge of the cell line:(36.88±3.40) mm, the vertical distance OE female acetabular centre to the sides of the upper edge of the cell line:(33.34±1.74) mm.2,male, female acetabular centre to bilateral obturator line distance of acetabulum tobilateral obturator line distance of59.14±0.022%. No significant differences between male, female (P>0.05). In2, THA in acetabular component within the medial walljust wear when the load and displacement of large, and its initial stability is relativelylarge;3, according to the vertical distance from the center to both sides of the obturator on acetabular edge of the connection and of acetabulum to bilateral obturator wiring distance percentage, which can provide a reference point for total hip replacement determination;4, according to the relationship between the acetabular fossa ovalisand the acetabulum and acetabular center point, method of rotating rotation of the reconstruction of the hip joint is feasible;5, according to the results of mechanical testingin vitro, which can provide experimental basis for improving the initial stability of theacetabular component.