Mathematical evaluation of jumping distance in total hip arthroplasty: influence of abduction angle, femoral head offset, and head diameter.
Mathematical evaluation of jumping distance in total hip arthroplasty: influence of abduction angle, femoral head offset, and head diameter.
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DOI：
10.3109/17453670902988378
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发表时间：
2009-06
影响因子：
3.7
通讯作者：
Catonné Y
中科院分区：
文献类型：
--
作者：
Sariali E;Lazennec JY;Khiami F;Catonné Y
背景与目的跳跃距离（jumping distance，JD）是指股骨头中心在脱位发生前所需的侧向平移程度。距离越小，脱位的理论风险越高。我们的研究的目的是评估这种跳跃的距离和它的变化，根据植入物的特点，也在使用大的头部直径超过38 mm的理论增益。方法JD计算作为一个功能的杯前倾和外展角，头部直径，和头部偏移（定义为股骨头的中心和杯开口平面之间的距离）。分析了28、32、36、40、44和48 mm股骨头直径。外展角从0°增加到80°，增量为10°。前倾角从0°增加到40°，增量为5°。结果随着髋臼杯外展角的增加，跳跃距离逐渐减小（直径32mm的髋臼杯，外展角每增加1°，跳跃距离为0.25mm）。前倾角每增加1°，其增加0.05 mm。跳跃距离随着股骨头直径的增加而增加（对于45°外展角，每mm直径为0.4 mm）。然而，通过增加直径获得的净增益随着外展角的增加而减少（对于60°外展，每mm直径为0.25）。股骨头偏心距每增加1 mm，JD下降0.92 mm，表明股骨头偏心距是影响JD的最重要参数。解释在髋臼杯外展角较大的情况下，使用大股骨头（大于36 mm）获得的稳定性理论增益可以忽略不计。股骨头偏心距的增加大大减少了跳跃距离，因此应避免。
Background and purpose The jumping distance (JD) is the degree of lateral translation of the femoral head center required before dislocation occurs. The smaller the distance, the higher the theoretical risk of dislocation. The aim of our study was to evaluate this jumping distance and its variation according to the characteristics of the implant, and also the theoretical gain in using large head diameters of above 38 mm. Methods The JD was calculated as a function of the cup ante-version and abduction angles, the head diameter, and the head offset (defined as the distance between the center of the femoral head and the cup opening plane). Head diameters of 28, 32, 36, 40, 44 and 48 mm were analyzed. The abduction angle was increased from 0° to 80° with a 10° increment. The anteversion angle was increased from 0° to 40° with a 5° increment. Results The jumping distance was found to decrease as the cup abduction angle increased (0.25 mm each 1° for 32-mm head diameter). It increased by 0.05 mm for a 1° increase in the ante-version angle. The jumping distance increased as the head diameter increased (0.4 mm each mm diameter for a 45° abduction angle). The net gain obtained by increasing the diameter, however, decreased when abduction angle increased (0.25 each mm diameter for 60° abduction). The JD decreased by 0.92 mm for each 1-mm increase in head offset, showing that head offset was the most important parameter influencing the JD. Interpretation The theoretical gain in stability obtained by using a large femoral head (above 36 mm) is negligible in cases where there is a high cup abduction angle. An increase in offset of the femoral head substantially reduces the jumping distance and it should therefore be avoided.
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DOI：
10.1097/01.blo.0000150310.25603.26
发表时间：
2004-12-01
影响因子：
4.2
作者：
Amstutz, HC;Le Duff, MJ;Beaulé, PE
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发表时间：
2002-02-01
影响因子：
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通讯作者：
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影响因子：
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