Exploring the Use of Non-Image-Based Ultrasound to Detect the Position of the Residual Femur within a Stump

• Published in: PloS one 2016-10, Vol.11 (10), p.e0164583-e0164583
• Main Authors: Chong, Sook-Yee, Röhrle, Oliver
• Format: Article
• Language: English
• Subjects: Adult; Amputation; Amputation Stumps - diagnostic imaging; Artificial Limbs; Biology and Life Sciences; Biomechanics; Body weight; Control stability; Dynamic stability; Engineering and Technology; Female; Femur; Femur - diagnostic imaging; Gait; Health aspects; Health risks; Humans; Image detection; Imaging techniques; Male; Medical imaging; Medicine and Health Sciences; NMR; Nuclear magnetic resonance; Physical Sciences; Pressure distribution; Prostheses; Prostheses and implants; Prosthesis Design; Prosthesis Fitting - methods; Prosthetics; Reproducibility; Research and Analysis Methods; Ultrasonic imaging; Ultrasonography; Ultrasound; X rays
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0164583

A satisfactorily fitted socket interacts dynamically with the stump in order to support body weight, transmit load effectively, enhance dynamic stability, and enable the control and stabilization of the residual limb. The internal dynamics occurring within a socket is important in determining optimal fit. Many measurement and imaging techniques, such as X-rays, have been utilized to investigate the movement of the residual femur within the stump during gait. However, due to associated health risks and costs, none of the current techniques have been extended to clinical prosthetics. The use of B-mode ultrasound has been suggested as a safe and cheap alternative, and has been utilized in previous studies to monitor the motion of the femur. However, the need to create a duplicate socket and time-consuming analysis of the images were obstacles to the system being applied clinically. This study aims to gauge the effectiveness of a non-image based ultrasound system. Here, we determined errors expected from the measurements. Accuracy errors of 2.9 mm to 8.4 mm and reproducibility measurements within a standard deviation of 3.9 mm are reported. We also estimated errors up to 14.4 mm in in-vivo measurements. We think there is potential in developing this technique, and we hope to reduce some technical difficulties such that it can, one day, be easily incorporated into prosthetic fitting.