Background

This study presented the load profile applied on transfemoral osseointegrated implants by bone-anchored prostheses fitted with state-of-the-art ÖSSUR microprocessor-controlled Rheo Knee XC and energy-storing-and-returning Pro-Flex XC or LP feet during five standardized daily activities.

Methods

This cross-sectional cohort study included 13 participants fitted with a press-fit transfemoral osseointegrated implant. Loading data were directly measured with the tri-axial transducer of an iPecsLab (RTC Electronics, USA) fitted between the implant and knee unit. The loading profile was characterized by spatio-temporal gaits variables, magnitude of loading boundaries as well as onset and magnitude of loading extrema during walking, ascending and descending ramp and stairs.

Findings

A total of 2127 steps was analysed. The cadence ranged between 36 ± 7 and 47 ± 6 strides/min. The absolute maximum force and moments applied across all activities was 1322 N, 388 N and 133 N as well as 22 Nm, 52 Nm and 88 Nm on and around the long, anteroposterior and mediolateral axes of the implant, respectively.

Interpretation

This study provided new benchmark loading data applied by transfemoral bone-anchored prostheses fitted with selected ÖSSUR state-of-the-art components. Outcomes suggested that such prostheses can generate relevant loads at the interface with the osseointegrated implant to restore ambulation effectively. This study is a worthwhile contribution toward a systematic recording, analysis, and reporting of ecological prosthetic loading profiles as well as closing the evidence gaps between prescription and biomechanical benefits of state-of-the-art components. Hopefully, this will contribute to improve outcomes for growing number of individuals with limb loss opting for bionic solutions.

中文翻译：

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通过配备最先进假体组件的经股骨锚定假体对骨整合植入物施加负载

背景

本研究展示了在五个标准化过程中，通过配备最先进的 ÖSSUR 微处理器控制的 Rheo Knee XC 和储能和返回 Pro-Flex XC 或 LP 脚的骨锚定假体应用于经股骨骨整合植入物的负载曲线日常活动。

方法

这项横断面队列研究包括 13 名参与者，他们配备了压合式经股骨整合植入物。加载数据直接使用安装在植入物和膝关节单元之间的 iPecsLab（RTC Electronics，美国）的三轴传感器测量。加载曲线的特征是时空步态变量、加载边界的大小以及行走、上升和下降坡道和楼梯期间加载极值的开始和大小。

发现

总共分析了 2127 个步骤。步频介于 36 ± 7 和 47 ± 6 步/分钟之间。在所有活动中施加的绝对最大力和力矩分别为 1322 N、388 N 和 133 N，以及在植入物的长轴、前后轴和中外侧轴上和周围分别为 22 Nm、52 Nm 和 88 Nm。

解释

这项研究提供了新的基准载荷数据，该数据由装有精选 ÖSSUR 最先进组件的经股骨锚定假体应用。结果表明，这种假体可以在与骨整合植入物的界面处产生相关载荷，从而有效地恢复行走。这项研究对系统记录、分析和报告生态假肢负荷曲线以及缩小最先进组件的处方和生物力学益处之间的证据差距做出了有价值的贡献。希望这将有助于改善越来越多的肢体丧失患者选择仿生解决方案的结果。