Won C H, Hearn T C, Tile M
Department of Surgery, Sunnybrook Health Science Centre University of Toronto, North York, Ontario, Canada.
J Bone Joint Surg Br. 1995 May;77(3):484-9.
Adult human cadaver pelves were tested to determine micromotion at the prosthesis-bone interface in cementless hemispherical acetabular components during simulated single-limb stance. The micromotion of non-press-fit components with screw fixation in response to cyclic loads to a maximum of 1500N was compressive (interface closing) at the superior iliac rim and distractive (interface opening) at the inferior ischial rim; that of press-fit components was compressive all around the acetabular rim regardless of screw fixation. Adding screws to the component decreased the micromotion at the site of the screw, but sometimes increased it at the opposite side. Two dome screws with the press-fit component decreased the micromotion at the superior iliac rim but at the inferior ischial rim there was either no change or increased movement. A press-fit cup shows less micromotion than a non-press-fit cup with screw fixation. The addition of screws to a press-fit cup does not necessarily increase the initial stability.
对成年人体尸体骨盆进行测试，以确定在模拟单腿站立期间，非骨水泥半球形髋臼组件中假体-骨界面处的微动情况。在最大为1500N的循环载荷作用下，采用螺钉固定的非压配组件在髂嵴上缘的微动是压缩性的（界面闭合），而在坐骨下缘则是牵张性的（界面张开）；压配组件在髋臼边缘周围无论有无螺钉固定，微动均为压缩性。在组件上添加螺钉可减少螺钉部位的微动，但有时会增加其对侧的微动。带有压配组件的两个穹顶螺钉可减少髂嵴上缘的微动，但在坐骨下缘要么没有变化，要么运动增加。压配杯显示出的微动比采用螺钉固定的非压配杯要少。在压配杯中添加螺钉不一定会增加初始稳定性。
