The purpose of this study was to provide a quantitative description of residual femur motion within the socket during gait and to explore the relationship between residual femur motion and patient-reported comfort and function. It was hypothesized that increased residual bone movement would correlate to worse patient-reported comfort and function. The secondary goals were to assess within-subject step-to-step variability and between-subject variability in residual femur motion within the socket during gait. Dynamic biplane radiography, combined with conventional motion capture, was used to measure residual femur motion within the socket during treadmill walking for 10 unilateral transfemoral amputees. The questionnaire for persons with a transfemoral amputation (Q-TFA) was administered to assess prosthetic use, mobility, health problems, and global health. Increased femur pistoning (proximal-distal translation relative to the socket) correlated with worsening Q-TFA problem and global scores (ρ = 0.741, p = 0.04 and ρ = -0.783, p = 0.02, respectively). Average residual femur rotation ROMs were 7.3°±3.7°, 10.8°±4.4°, and 7.7°±4.8° for anterior tilt, internal-external rotation, and varus-valgus, respectively. Average residual femur translation ROMs were 8.6 mm ± 3.0 mm, 28.4 mm ± 13.9 mm, and 20.4 mm ± 7.2 mm for medial–lateral, pistoning, and anterior-posterior directions, respectively. Within-subject rotational and translational variability during gait averaged 2.8° and 2.0 mm or less, whereas the between-subject variability was up to 9.4° and 18.6 mm, which demonstrates residual femur motion relative to the socket is repeatable within subjects, but inconsistent across subjects during gait. The results suggest residual bone motion within the socket is a potential mechanism behind patient-reported problems and suggests a target for intervention aimed at improving transfemoral amputee quality of life.

这项研究的目的是定量描述步态中窝内残余股骨运动，并探讨残余股骨运动与患者报告的舒适度和功能之间的关系。据推测，残余骨运动的增加将与患者报告的较差的舒适度和功能相关。次要目标是评估步态期间承窝内残余股骨运动的受试者内部逐步变异和受试者间变异。动态双翼X线照相与常规运动捕获相结合，用于在跑步机上行走10个单侧经股截肢者时测量承窝内残余股骨运动。进行了经股截肢患者问卷（Q-TFA），以评估假肢的使用，活动性，健康问题，和全球健康。股骨活塞增加（相对于承窝近端平移）与恶化的Q-TFA问题和整体评分相关（分别为ρ= 0.741，p = 0.04和ρ= -0.783，p = 0.02）。对于前倾斜，内外旋转和内翻外翻，平均残余股骨旋转ROM分别为7.3°±3.7°，10.8°±4.4°和7.7°±4.8°。内侧，外侧，活塞和前后方向的平均残留股骨平移ROM分别为8.6 mm±3.0 mm，28.4 mm±13.9 mm和20.4 mm±7.2 mm。步态期间受试者内部的旋转和平移变异性平均为2.8°和2.0 mm或更小，而受试者之间的变异性高达9.4°和18.6 mm，这表明相对于承窝的残余股骨运动在受试者中是可重复的，但步态不一致。结果表明，窝内残留的骨骼运动是患者报告问题背后的潜在机制，并提出了旨在改善经股截肢者生活质量的干预目标。