新一代短柄髋关节植入物的设计理念是通过促进与生理相似的加载方式将应力一应变遮挡和植人物远期松动率降至最低。至今仍缺乏远期临床研究来证明短柄植人物的优点。由于缺乏临床数据，因此可以使用数字模拟来预测其远期性能。通过有限...新一代短柄髋关节植入物的设计理念是通过促进与生理相似的加载方式将应力一应变遮挡和植人物远期松动率降至最低。至今仍缺乏远期临床研究来证明短柄植人物的优点。由于缺乏临床数据，因此可以使用数字模拟来预测其远期性能。通过有限元研究预测短柄植入物的初始和远期稳定性，从界面微动方面对植入物的初始稳定性进行评价。结果发现，初始稳定性在允许骨整合出现的极限内。使用应变适应性骨重建法则对远期稳定性进行评估，进而在骨密度（bone mineral density，BMD）变化方面对骨的远期行为进行预测。在经典的Gruen1区和Gruen7区内未发现BMD降低，且骨重建模式与文献中髋关节表面置换的结果相似。展开更多
It is a research which could enter into contradiction with the current trend concerning the hip implants. It is known as sliding friction, which is characteristic of present artificial hip joints, is higher than in th...It is a research which could enter into contradiction with the current trend concerning the hip implants. It is known as sliding friction, which is characteristic of present artificial hip joints, is higher than in the case of rolling friction. The paper reports the studies of the functioning mode of a novel spherical bearing MoM （metal on metal） with rolling friction, with potential application for an artificial hip joint obtained by introducing a number of balls between the femoral head and the acetabular cup. After over 15 years of research upon the functional principle and constructive solution, a version that offered a coefficient of minimum friction in the hip joint came to light. This version was based on a constructive solution of motion with lower friction, ＂Omnitrack~ movement solutions＂, which has been modified and rebuilt to be used as a joint of a total hip prosthesis--MOMJ. The joint was built entirely in stainless steel, SS316L medical grade. Tests have been carried out on the experimental laboratory devices that showed very low values of the coefficient of friction （μ = 0.0225）. For validation, the prosthesis had to be put through tests for 500,000 cycles, in terms of physiological motion and dynamic loading, according to ISO 14242-3. Testing was conducted on a multiaxial dynamics machine, MTS Bionix, equipped with system for hip implant testing. The testing results of this total hip prosthesis with rolling friction have been successful in signing up for a friction moment of 0.525 kNmm which means a coefficient of friction la = 0.0143, for a joint with femoral head diameter 28 mm.展开更多
文摘新一代短柄髋关节植入物的设计理念是通过促进与生理相似的加载方式将应力一应变遮挡和植人物远期松动率降至最低。至今仍缺乏远期临床研究来证明短柄植人物的优点。由于缺乏临床数据，因此可以使用数字模拟来预测其远期性能。通过有限元研究预测短柄植入物的初始和远期稳定性，从界面微动方面对植入物的初始稳定性进行评价。结果发现，初始稳定性在允许骨整合出现的极限内。使用应变适应性骨重建法则对远期稳定性进行评估，进而在骨密度（bone mineral density，BMD）变化方面对骨的远期行为进行预测。在经典的Gruen1区和Gruen7区内未发现BMD降低，且骨重建模式与文献中髋关节表面置换的结果相似。
文摘It is a research which could enter into contradiction with the current trend concerning the hip implants. It is known as sliding friction, which is characteristic of present artificial hip joints, is higher than in the case of rolling friction. The paper reports the studies of the functioning mode of a novel spherical bearing MoM （metal on metal） with rolling friction, with potential application for an artificial hip joint obtained by introducing a number of balls between the femoral head and the acetabular cup. After over 15 years of research upon the functional principle and constructive solution, a version that offered a coefficient of minimum friction in the hip joint came to light. This version was based on a constructive solution of motion with lower friction, ＂Omnitrack~ movement solutions＂, which has been modified and rebuilt to be used as a joint of a total hip prosthesis--MOMJ. The joint was built entirely in stainless steel, SS316L medical grade. Tests have been carried out on the experimental laboratory devices that showed very low values of the coefficient of friction （μ = 0.0225）. For validation, the prosthesis had to be put through tests for 500,000 cycles, in terms of physiological motion and dynamic loading, according to ISO 14242-3. Testing was conducted on a multiaxial dynamics machine, MTS Bionix, equipped with system for hip implant testing. The testing results of this total hip prosthesis with rolling friction have been successful in signing up for a friction moment of 0.525 kNmm which means a coefficient of friction la = 0.0143, for a joint with femoral head diameter 28 mm.
