Technol Health Care. 2021;29(1):175-185. doi: 10.3233/THC-192006.
Even though the importance of leg length discrepancy (LLD), with its potential of causing several pathological conditions or gait deviations, is well known, measuring LLD is still challenging with limited reliability and validity.
To assess the capability of the dynamic leg length (DLL) measurement in detecting the presence of anatomic LLD.
A lower limb x-ray was performed on 15 participants with suspected LLD in addition to a gait analysis study using a motion analysis system to measure DLL (the absolute distance from the hip joint centre to the heel, to the ankle joint centre and to the forefoot). Average DLLs were compared between sides for symmetry by the paired t-test at 51 sample points during the gait cycle in conjunction with the differences between the sides based on the maximal stance phase and minimal swing phase DLLs. Differences were correlated with anatomic LLD by Pearson correlation.
No significant differences in DLLs between sides throughout the gait cycle were found. Significant differences between sides were found between the maximal stance and minimal swing phase DLLs.
DLL measurement is capable of detecting an anatomic leg length difference based on functional changes in leg length and functional discrepancy.
尽管腿长差异（LLD）的重要性及其导致多种病理状况或步态偏差的潜在风险已得到广泛认可，但由于其可靠性和有效性有限，测量 LLD 仍然具有挑战性。
评估动态腿长（DLL）测量在检测解剖学 LLD 存在方面的能力。
对 15 名疑似 LLD 的参与者进行下肢 X 光检查，并使用运动分析系统进行步态分析研究，以测量 DLL（髋关节中心到脚跟、踝关节中心到前脚掌的绝对距离）。在步态周期的 51 个采样点，通过配对 t 检验比较双侧 DLL 的对称性，同时比较最大站立相和最小摆动相 DLL 之间的双侧差异。差异与解剖学 LLD 之间通过 Pearson 相关进行相关性分析。
在整个步态周期中，双侧 DLL 之间未发现显著差异。在最大站立相和最小摆动相 DLL 之间发现了双侧的显著差异。
DLL 测量能够根据腿长和功能差异的功能性变化检测解剖学腿长差异。
