Brand R A, Yack H J
Department of Orthopaedic Surgery, College of Medicine, The University of Iowa, Iowa City 52242, USA.
Clin Orthop Relat Res. 1996 Dec(333):172-80.
The authors questioned whether leg length discrepancies of the magnitude ordinarily seen after total hip reconstruction (<2 cm) would substantially alter hip joint forces. Using conventional gait analysis techniques to ascertain intersegmental resultant hip forces and moments, the authors used lifts to simulate leg length discrepancies of 2.3, 3.5, and 6.5 cm in 7 normal subjects. The 2.3-cm lift produced no changes. On the side of the lift (long limb), the 3.5- and 6.5-cm lifts modestly decreased mean peak intersegmental resultant hip forces by 6% and 12%, respectively, but not moments. The changes were, however, variable, with a few subjects showing increases and the rest showing decreases in selected forces or moments. On the side opposite to the lift (short limb), the 3.5- and 6.5-cm lifts increased mean peak intersegmental resultant hip forces by 2% to 12%, but not moments except in 1 case (8%). It is concluded that leg length discrepancies of the sort commonly seen after total hip reconstruction would likely cause no substantial changes in hip forces.
作者们质疑全髋关节重建术后常见的腿长差异程度（<2厘米）是否会显著改变髋关节受力。作者们运用传统步态分析技术来确定节段间髋关节合力和力矩，通过垫高来模拟7名正常受试者2.3厘米、3.5厘米和6.5厘米的腿长差异。2.3厘米的垫高未产生变化。在垫高侧（长腿侧），3.5厘米和6.5厘米的垫高分别使节段间髋关节平均峰值合力适度降低了6%和12%，但力矩未变。然而，这些变化是可变的，少数受试者的特定力或力矩增加，其余受试者则减少。在垫高对侧（短腿侧），3.5厘米和6.5厘米的垫高使节段间髋关节平均峰值合力增加了2%至12%，力矩除1例（8%）外未变。研究得出结论，全髋关节重建术后常见的腿长差异可能不会导致髋关节受力发生实质性变化。
