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Badaire P, Robert MT, Turcot K. The Overlay, a New Solution for Volume Variations in the Residual Limb for Individuals with a Transtibial Amputation. SENSORS (BASEL, SWITZERLAND) 2024; 24:4744. [PMID: 39066140 PMCID: PMC11281076 DOI: 10.3390/s24144744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 07/05/2024] [Accepted: 07/17/2024] [Indexed: 07/28/2024]
Abstract
BACKGROUND The company Ethnocare has developed the Overlay, a new pneumatic solution for managing volumetric variations (VVs) of the residual limb (RL) in transtibial amputees (TTAs), which improves socket fitting. However, the impact of the Overlay during functional tasks and on the comfort and pain felt in the RL is unknown. METHODS 8 TTAs participated in two evaluations, separated by two weeks. We measured compensatory strategies (CS) using spatio-temporal parameters and three-dimensional lower limb kinematics and kinetics during gait and sit-to-stand (STS) tasks. During each visit, the participant carried out our protocol while wearing the Overlay and prosthetic folds (PFs), the most common solution to VV. Between each task, comfort and pain felt were assessed using visual analog scales. RESULTS While walking, the cadence with the Overlay was 105 steps/min, while it was 101 steps/min with PFs (p = 0.021). During 35% and 55% of the STS cycle, less hip flexion was observed while wearing the Overlay compared to PFs (p = 0.004). We found asymmetry coefficients of 13.9% with the Overlay and 17% with PFs during the STS (p = 0.016) task. Pain (p = 0.031), comfort (p = 0.017), and satisfaction (p = 0.041) were better with the Overlay during the second visit. CONCLUSION The Overlay's impact is similar to PFs' but provides less pain and better comfort.
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Affiliation(s)
- Pierre Badaire
- Centre Interdisciplinaire de Recherche en Réadaptation et Intégration Sociale (Cirris)—525, Boul. Wilfrid-Hamel, Aile H Local 1300, Québec, QC G1M 2S8, Canada; (P.B.); (M.T.R.)
- Département de Kinésiologie, Pavillon de l’Éducation Physique et des Sports, Université Laval, (PEPS) 2300, rue de la Terrasse, Local 2144, Québec, QC G1V 0A6, Canada
| | - Maxime T. Robert
- Centre Interdisciplinaire de Recherche en Réadaptation et Intégration Sociale (Cirris)—525, Boul. Wilfrid-Hamel, Aile H Local 1300, Québec, QC G1M 2S8, Canada; (P.B.); (M.T.R.)
- École des Sciences de la Réadaptation, Université Laval, Pavillon Ferdinand-Vandry, 1050, Avenue de la Médecine, Local 4770, Québec, QC G1V 0A6, Canada
| | - Katia Turcot
- Centre Interdisciplinaire de Recherche en Réadaptation et Intégration Sociale (Cirris)—525, Boul. Wilfrid-Hamel, Aile H Local 1300, Québec, QC G1M 2S8, Canada; (P.B.); (M.T.R.)
- Département de Kinésiologie, Pavillon de l’Éducation Physique et des Sports, Université Laval, (PEPS) 2300, rue de la Terrasse, Local 2144, Québec, QC G1V 0A6, Canada
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Cutti AG, Santi MG, Hansen AH, Fatone S. Accuracy, Repeatability, and Reproducibility of a Hand-Held Structured-Light 3D Scanner across Multi-Site Settings in Lower Limb Prosthetics. SENSORS (BASEL, SWITZERLAND) 2024; 24:2350. [PMID: 38610559 PMCID: PMC11014038 DOI: 10.3390/s24072350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 03/24/2024] [Accepted: 03/27/2024] [Indexed: 04/14/2024]
Abstract
The aim of this work was to assess the accuracy, repeatability, and reproducibility of a hand-held, structured-light 3D scanner (EINScan Pro 2X Plus with High Definition Prime Pack, SHINING 3D Tech. Co., Ltd., Hangzhou, China), to support its potential use in multi-site settings on lower limb prosthetics. Four limb models with different shapes were fabricated and scanned with a metrological 3D scanner (EINScan Laser FreeScan 5X, SHINING 3D Tech. Co., Ltd., Hangzhou, China) by a professional operator (OP0). Limb models were then mailed to three sites where two operators (OP1, OP2) scanned them using their own structured-light 3D scanner (same model). OP1 scanned limb models twice (OP1-A, OP1-B). OP0, OP1-A, and OP2 scans were compared for accuracy, OP1-A and OP1-B for repeatability, and OP1-A and OP2 for reproducibility. Among all comparisons, the mean radial error was <0.25 mm, mean angular error was <4°, and root mean square error of the radial distance was <1 mm. Moreover, limits of agreement were <3.5% for perimeters and volumes. By comparing these results with respect to clinically-relevant thresholds and to the literature available on other 3D scanners, we conclude that the EINScan Pro 2X Plus 3D Scanner with High Definition Prime Pack has good accuracy, repeatability, and reproducibility, supporting its use in multi-site settings.
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Affiliation(s)
| | - Maria Grazia Santi
- Department of Industrial Engineering, University of Padova, 35131 Padova, Italy;
| | - Andrew H. Hansen
- Minneapolis VA Health Care System, One Veterans Drive, Minneapolis, MN 55417, USA;
- Department of Family Medicine and Community Health, Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
| | - Stefania Fatone
- NUOPC, Department of Physical Medicine and Rehabilitation, Northwestern University, 680 N Lake Shore Dr, Suite 1100, Chicago, IL 60611, USA
- Department of Rehabilitation Medicine, University of Washington, 1959 NE Pacific St., P.O. Box 356490, Seattle, WA 98195, USA
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Ngan CC, Pendse V, Sivasambu H, Ouellette E, Ready N, Andrysek J. Preliminary characterization of rectification for transradial prosthetic sockets. Sci Rep 2024; 14:5759. [PMID: 38459106 PMCID: PMC10924101 DOI: 10.1038/s41598-024-56333-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 03/05/2024] [Indexed: 03/10/2024] Open
Abstract
Achieving proper socket fit is crucial for the effective use of a prosthesis. However, digital socket design lacks standardization and presents a steep learning curve for prosthetists. While research has focused on digital socket design for the lower-limb population, there is a research gap in upper-limb socket design. This study aimed to characterize the design (rectification) process for the transradial socket, specifically the three-quarter Northwestern-style design, towards the development of a more systematic, data-driven socket design approach. Fourteen (n = 14) pairs of unrectified and rectified plaster models were compared. Six common rectification zones were identified through shape analysis, with zones of plaster addition being the most prominent in terms of volume and surface area. A novel 3D vector mapping technique was employed, which revealed that most of the shape changes occurred in the anterior-posterior and proximal-distal directions. Overall, the interquartile range of each rectification zone demonstrated reasonable consistency in terms of volume, surface deviation, and 3D vector representation. The initial findings from this study support the potential for quantitively modelling the transradial socket design process. This opens the door for developing tools for categorizing and predicting socket designs across diverse populations through the application of techniques such as machine learning.
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Affiliation(s)
- Calvin C Ngan
- University of Toronto, Toronto, Canada
- Holland Bloorview Kids Rehabilitation Hospital, Toronto, Canada
| | - Vishal Pendse
- University of Toronto, Toronto, Canada
- Holland Bloorview Kids Rehabilitation Hospital, Toronto, Canada
| | - Harry Sivasambu
- Holland Bloorview Kids Rehabilitation Hospital, Toronto, Canada
| | | | - Neil Ready
- Holland Bloorview Kids Rehabilitation Hospital, Toronto, Canada
| | - Jan Andrysek
- University of Toronto, Toronto, Canada.
- Holland Bloorview Kids Rehabilitation Hospital, Toronto, Canada.
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Lanahan CR, Coburn KA, Hafner BJ, Ballesteros D, Allyn KJ, Friedly JL, Ciol MA, Carter RV, Mertens JC, Krout AJ, Sanders JE. Short partial doffs of release/relock sockets may effectively stabilize limb fluid volume in prosthesis users with transtibial amputation. Clin Biomech (Bristol, Avon) 2023; 106:105986. [PMID: 37210769 DOI: 10.1016/j.clinbiomech.2023.105986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 04/18/2023] [Accepted: 05/10/2023] [Indexed: 05/23/2023]
Abstract
BACKGROUND A challenge often faced by people with lower extremity amputation is management of prosthetic socket fit due to changes in fluid volume within their residual limb. Prior research suggests that intermittently doffing the prosthetic socket may help stabilize daily residual limb fluid volume. METHODS To assess the effects of partial doff duration on residual limb fluid volume retention, participants with transtibial amputation were tested by walking on a treadmill in a controlled, laboratory setting under three conditions. An automated system to release the locking pin and enlarge the socket was used to produce the partial doffing. Percent limb fluid volume changes after partial doffing for 4 min (Short Rest) and for 10 min (Long Rest) were compared with no partial doffing (No Release). Limb fluid volume was monitored using bioimpedance analysis. FINDINGS Mean percent fluid volume changes in the posterior region were -1.2% for No Release, 2.7% for Short Rest, and 1.0% for Long Rest. Short and Long Rests had larger increases than No Release (P = 0.005 and 0.03, respectively); Short and Long Rests were not statistically different (P = 0.10). Eight of the thirteen participants experienced a higher percent fluid volume gain for both release protocols while four experienced a higher percent fluid volume gain for only one release protocol. INTERPRETATION A partial doff duration as short as 4 min may be an effective strategy to stabilize limb fluid volume in prosthesis users with transtibial amputation. Trials in at-home settings should be pursued.
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Affiliation(s)
- Conor R Lanahan
- University of Washington, Department of Bioengineering, Seattle, WA, USA
| | - Kendrick A Coburn
- University of Washington, Department of Bioengineering, Seattle, WA, USA
| | - Brian J Hafner
- University of Washington, Department of Rehabilitation Medicine, Seattle, WA, USA
| | - Daniel Ballesteros
- University of Washington, Department of Bioengineering, Seattle, WA, USA
| | - Katheryn J Allyn
- University of Washington, Department of Bioengineering, Seattle, WA, USA
| | - Janna L Friedly
- University of Washington, Department of Rehabilitation Medicine, Seattle, WA, USA
| | - Marcia A Ciol
- University of Washington, Department of Rehabilitation Medicine, Seattle, WA, USA
| | - Ryan V Carter
- University of Washington, Department of Bioengineering, Seattle, WA, USA
| | - Joseph C Mertens
- University of Washington, Department of Bioengineering, Seattle, WA, USA
| | - Adam J Krout
- University of Washington, Department of Bioengineering, Seattle, WA, USA
| | - Joan E Sanders
- University of Washington, Department of Bioengineering, Seattle, WA, USA.
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Plesec V, Humar J, Dobnik-Dubrovski P, Harih G. Numerical Analysis of a Transtibial Prosthesis Socket Using 3D-Printed Bio-Based PLA. MATERIALS (BASEL, SWITZERLAND) 2023; 16:1985. [PMID: 36903100 PMCID: PMC10004398 DOI: 10.3390/ma16051985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 02/21/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
Lower-limb prosthesis design and manufacturing still rely mostly on the workshop process of trial-and-error using expensive unrecyclable composite materials, resulting in time-consuming, material-wasting, and, ultimately, expensive prostheses. Therefore, we investigated the possibility of utilizing Fused Deposition Modeling 3D-printing technology with inexpensive bio-based and bio-degradable Polylactic Acid (PLA) material for prosthesis socket development and manufacturing. The safety and stability of the proposed 3D-printed PLA socket were analyzed using a recently developed generic transtibial numeric model, with boundary conditions of donning and newly developed realistic gait cycle phases of a heel strike and forefoot loading according to ISO 10328. The material properties of the 3D-printed PLA were determined using uniaxial tensile and compression tests on transverse and longitudinal samples. Numerical simulations with all boundary conditions were performed for the 3D-printed PLA and traditional polystyrene check and definitive composite socket. The results showed that the 3D-printed PLA socket withstands the occurring von-Mises stresses of 5.4 MPa and 10.8 MPa under heel strike and push-off gait conditions, respectively. Furthermore, the maximum deformations observed in the 3D-printed PLA socket of 0.74 mm and 2.66 mm were similar to the check socket deformations of 0.67 mm and 2.52 mm during heel strike and push-off, respectively, hence providing the same stability for the amputees. We have shown that an inexpensive, bio-based, and bio-degradable PLA material can be considered for manufacturing the lower-limb prosthesis, resulting in an environmentally friendly and inexpensive solution.
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Affiliation(s)
- Vasja Plesec
- Laboratory for Intelligent CAD Systems, Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Jani Humar
- Laboratory for Intelligent CAD Systems, Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Polona Dobnik-Dubrovski
- Mechanical Engineering Research Institute, Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Gregor Harih
- Laboratory for Intelligent CAD Systems, Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
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Youngblood RT, Hafner BJ, Czerniecki JM, Larsen BG, Allyn KJ, Sanders JE. Mechanically and physiologically optimizing prosthetic elevated vacuum systems in people with transtibial amputation: a pilot study. JOURNAL OF PROSTHETICS AND ORTHOTICS : JPO 2022; 34:194-201. [PMID: 36582938 PMCID: PMC9793861 DOI: 10.1097/jpo.0000000000000396] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Introduction The most suitable elevated vacuum (EV) pressure may differ for each individual prosthesis user depending on suspension needs, socket fit, prosthetic components, and health. Mechanical and physiological effects of EV were evaluated in an effort to determine the optimal vacuum pressure for three individuals. Methods Instrumented EV sockets were created based on the participants' regular EV sockets. Inductive distance sensors were embedded into the wall of the socket at select locations to measure limb movement relative to the socket. Each participant conducted an activity protocol while limb movement, limb fluid volume, and user-reported comfort were measured at various socket vacuum pressure settings. Results Increased socket vacuum pressure resulted in reduced limb-socket displacement for each participant; however, 81-93% of limb movement was eliminated by a vacuum pressure setting of 12 (approximately -9 inHg). Relative limb-socket displacement by sensor location varied for each participant, suggesting distinct differences related to socket fit or residual limb tissue content. The rate of limb fluid volume change and the change in socket comfort did not consistently differ with socket vacuum pressure, suggesting a more complex relationship unique to each individual. Conclusions Practitioners may use individual responses to optimize socket vacuum pressure settings, balancing mechanical and physiological effects of EV for improved clinical outcomes.
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Affiliation(s)
| | - Brian J Hafner
- Department of Rehabilitation Medicine, University of Washington, Seattle, WA, USA
| | - Joseph M Czerniecki
- VA Center for Limb Loss and Mobility, VA Puget Sound Health Care System, Seattle, WA, USA
| | - Brian G Larsen
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Katheryn J Allyn
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Joan E Sanders
- Department of Bioengineering, University of Washington, Seattle, WA, USA
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Ngan CC, Sivasambu H, Ramdial S, Andrysek J. Evaluating the Reliability of a Shape Capturing Process for Transradial Residual Limb Using a Non-Contact Scanner. SENSORS (BASEL, SWITZERLAND) 2022; 22:6863. [PMID: 36146212 PMCID: PMC9505365 DOI: 10.3390/s22186863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/06/2022] [Accepted: 09/08/2022] [Indexed: 06/16/2023]
Abstract
Advancements in digital imaging technologies hold the potential to transform prosthetic and orthotic practices. Non-contact optical scanners can capture the shape of the residual limb quickly, accurately, and reliably. However, their suitability in clinical practice, particularly for the transradial (below-elbow) residual limb, is unknown. This project aimed to evaluate the reliability of an optical scanner-based shape capture process for transradial residual limbs related to volumetric measurements and shape assessment in a clinical setting. A dedicated setup for digitally shape capturing transradial residual limbs was developed, addressing challenges with scanning of small residual limb size and aspects such as positioning and patient movement. Two observers performed three measurements each on 15 participants with transradial-level limb absence. Overall, the developed shape capture process was found to be highly repeatable, with excellent intra- and inter-rater reliability that was comparable to the scanning of residual limb cast models. Future work in this area should compare the differences between residual limb shapes captured through digital and manual methods.
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Affiliation(s)
- Calvin C. Ngan
- Institute of Biomedical Engineering, University of Toronto, Toronto, ON M5S 3G9, Canada
- Bloorview Research Institute, Holland Bloorview Kids Rehabilitation Hospital, Toronto, ON M4G 1R8, Canada
| | - Harry Sivasambu
- Bloorview Research Institute, Holland Bloorview Kids Rehabilitation Hospital, Toronto, ON M4G 1R8, Canada
| | - Sandra Ramdial
- Bloorview Research Institute, Holland Bloorview Kids Rehabilitation Hospital, Toronto, ON M4G 1R8, Canada
| | - Jan Andrysek
- Institute of Biomedical Engineering, University of Toronto, Toronto, ON M5S 3G9, Canada
- Bloorview Research Institute, Holland Bloorview Kids Rehabilitation Hospital, Toronto, ON M4G 1R8, Canada
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Anderst W, Fiedler G, Onishi K, McKernan G, Gale T, Paulus P. Within-subject effects of standardized prosthetic socket modifications on physical function and patient-reported outcomes. Trials 2022; 23:299. [PMID: 35413866 PMCID: PMC9006565 DOI: 10.1186/s13063-022-06205-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 03/26/2022] [Indexed: 11/28/2022] Open
Abstract
Background Among the challenges of living with lower limb loss is the increased risk of long-term health problems that can be either attributed directly to the amputation surgery and/or prosthetic rehabilitation or indirectly to a disability-induced sedentary lifestyle. These problems are exacerbated by poorly fit prosthetic sockets. There is a knowledge gap regarding how the socket design affects in-socket mechanics and how in-socket mechanics affect patient-reported comfort and function. The objectives of this study are (1) to gain a better understanding of how in-socket mechanics of the residual limb in transfemoral amputees are related to patient-reported comfort and function, (2) to identify clinical tests that can streamline the socket design process, and (3) to evaluate the efficacy and cost of a novel, quantitatively informed socket optimization process. Methods Users of transfemoral prostheses will be asked to walk on a treadmill wearing their current socket plus 8 different check sockets with designed changes in different structural measurements that are likely to induce changes in residual limb motion, skin strain, and pressure distribution within the socket. Dynamic biplane radiography and pressure sensors will be used to measure in-socket residual limb mechanics. Patient-reported outcomes will also be collected after wearing each socket. The effects of in-socket mechanics on both physical function and patient-reported outcomes (aim 1) will be assessed using a generalized linear model. Partial correlation analysis will be used to examine the association between research-grade measurements and readily available clinical measurements (aim 2). In order to compare the new quantitative design method to the standard of care, patient-reported outcomes and cost will be compared between the two methods, utilizing the Wilcoxon-Mann-Whitney non-parametric test (aim 3). Discussion Knowledge on how prosthetic socket modifications affect residual bone and skin biomechanics itself can be applied to devise future socket designs, and the methodology can be used to investigate and improve such designs, past and present. Apart from saving time and costs, this may result in better prosthetic socket fit for a large patient population, thus increasing their mobility, participation, and overall health-related quality of life. Trial registration ClinicalTrials.gov NCT05041998. Date of registration: Sept 13, 2021.
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Affiliation(s)
- William Anderst
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, USA
| | - Goeran Fiedler
- Department of Rehabilitation Science and Technology, University of Pittsburgh, Pittsburgh, USA.
| | - Kentaro Onishi
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, USA
| | - Gina McKernan
- Human Engineering Research Laboratory, University of Pittsburgh, Pittsburgh, USA
| | - Tom Gale
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, USA
| | - Paige Paulus
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, USA
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Scoping review to evaluate existing measurement parameters and clinical outcomes of transtibial prosthetic alignment and socket fit. Prosthet Orthot Int 2022; 46:95-107. [PMID: 35412519 DOI: 10.1097/pxr.0000000000000061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 08/09/2021] [Indexed: 02/03/2023]
Abstract
INTRODUCTION Fit and alignment are observable objectives of the prosthesis rendering process for individuals with lower limb amputation. Nevertheless, there is a dearth of validated measures to directly assess the quality of this clinical procedure. OBJECTIVES The objectives of this scoping review are to evaluate existing measurement parameters and clinical outcomes used in investigations of transtibial socket fit or prosthetic alignment and to identify gaps in the literature regarding tools for evaluation of prosthetic fitting. STUDY DESIGN Scoping literature review. METHODS A comprehensive search was conducted in the following databases: MEDLINE (through PubMed), Embase (through Elsevier), Scopus (through Elsevier), and Engineering Village (through Elsevier), resulting in 6107 studies to be screened. RESULTS Sixty-three studies were included in the review. When measuring fit, studies most frequently reported on patient-reported comfort (n = 22) and socket size compared with the residual limb volume (n = 9). Alignment was most frequently measured by the prosthetists' judgment and/or use of an alignment jig (n = 34). The measurement parameters used to determine alignment or fit varied greatly among the included studies. CONCLUSION This review demonstrated that most measures of socket fit rely on a patient's self-report and may vary with biopsychosocial factors unrelated to the socket fitting process. Meanwhile, alignment is determined mostly by the prosthetist's judgment, paired with objective measurements, such as alignment jigs and gait analysis. Efforts to standardize and validate measures of these parameters of prosthetic fitting are vital to improving clinical practice and reporting outcomes.
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Mellema M, Gjøvaag T. Reported Outcome Measures in Studies of Real-World Ambulation in People with a Lower Limb Amputation: A Scoping Review. SENSORS (BASEL, SWITZERLAND) 2022; 22:2243. [PMID: 35336412 PMCID: PMC8955603 DOI: 10.3390/s22062243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 03/08/2022] [Accepted: 03/10/2022] [Indexed: 12/02/2022]
Abstract
BACKGROUND The rapidly increasing use of wearable technology to monitor free-living ambulatory behavior demands to address to what extent the chosen outcome measures are representative for real-world situations. This scoping review aims to provide an overview of the purpose of use of wearable activity monitors in people with a Lower Limb Amputation (LLA) in the real world, to identify the reported outcome measures, and to evaluate to what extent the reported outcome measures capture essential information from real-world ambulation of people with LLA. METHODS The literature search included a search in three databases (MEDLINE, CINAHL, and EMBASE) for articles published between January 1999 and January 2022, and a hand-search. RESULTS AND CONCLUSIONS 98 articles met the inclusion criteria. According to the included studies' main objective, the articles were classified into observational (n = 46), interventional (n = 34), algorithm/method development (n = 12), and validity/feasibility studies (n = 6). Reported outcome measures were grouped into eight categories: step count (reported in 73% of the articles), intensity of activity/fitness (31%), type of activity/body posture (27%), commercial scores (15%), prosthetic use and fit (11%), gait quality (7%), GPS (5%), and accuracy (4%). We argue that researchers should be more careful with choosing reliable outcome measures, in particular, regarding the frequently used category step count. However, the contemporary technology is limited in providing a comprehensive picture of real-world ambulation. The novel knowledge from this review should encourage researchers and developers to engage in debating and defining the framework of ecological validity in rehabilitation sciences, and how this framework can be utilized in the development of wearable technologies and future studies of real-world ambulation in people with LLA.
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Affiliation(s)
- Mirjam Mellema
- Department of Mechanical, Electronic and Chemical Engineering, Faculty of Technology, Art and Design, Oslo Metropolitan University, P.O. Box 4, St. Olavs Plass, 0130 Oslo, Norway
- Department of Occupational Therapy, Prosthetics and Orthotics, Faculty of Health Sciences, Oslo Metropolitan University, P.O. Box 4, St. Olavs Plass, 0130 Oslo, Norway;
| | - Terje Gjøvaag
- Department of Occupational Therapy, Prosthetics and Orthotics, Faculty of Health Sciences, Oslo Metropolitan University, P.O. Box 4, St. Olavs Plass, 0130 Oslo, Norway;
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Cullen S, Mackay R, Mohagheghi A, Du X. The Use of Smartphone Photogrammetry to Digitise Transtibial Sockets: Optimisation of Method and Quantitative Evaluation of Suitability. SENSORS (BASEL, SWITZERLAND) 2021; 21:8405. [PMID: 34960503 PMCID: PMC8703273 DOI: 10.3390/s21248405] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 11/28/2021] [Accepted: 12/12/2021] [Indexed: 11/17/2022]
Abstract
The fit of a lower limb prosthetic socket is critical for user comfort and the quality of life of lower limb amputees. Sockets are conventionally produced using hand-crafted patient-based casting techniques. Modern digital techniques offer a host of advantages to the process and ultimately lead to improving the lives of amputees. However, commercially available scanning equipment required is often expensive and proprietary. Smartphone photogrammetry could offer a low cost alternative, but there is no widely accepted imaging technique for prosthetic socket digitisation. Therefore, this paper aims to determine an optimal imaging technique for whole socket photogrammetry and evaluate the resultant scan measurement accuracy. A 3D printed transtibial socket was produced to create digital and physical twins, as reference models. The printed socket was photographed from 360 positions and simplified genetic algorithms were used to design a series of experiments, whereby a collection of photos were processed using Autodesk ReCap. The most fit technique was used to assess accuracy. The accuracy of the socket wall volume, surface area and height were 61.63%, 99.61% and 99.90%, respectively, when compared to the digital reference model. The scanned model had a wall thickness ranging from 2.075 mm at the top to 7.758 mm towards the base of the socket, compared to a consistent thickness of 2.025 mm in the control model. The technique selected did not show sufficient accuracy for clinical application due to the degradation of accuracy nearer to the base of the socket interior. However, using an internal wall thickness estimation, scans may be of sufficient accuracy for clinical use; assuming a uniform wall thickness.
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Affiliation(s)
- Sean Cullen
- Department of Mechanical and Aerospace Engineering, College of Engineering Design and Physical Sciences, Brunel University, Kingston Lane, Uxbridge UB8 3PH, UK; (R.M.); (X.D.)
| | - Ruth Mackay
- Department of Mechanical and Aerospace Engineering, College of Engineering Design and Physical Sciences, Brunel University, Kingston Lane, Uxbridge UB8 3PH, UK; (R.M.); (X.D.)
| | - Amir Mohagheghi
- Sport, Health & Exercise Sciences, College of Health, Medicine and Life Sciences, Brunel University, Kingston Lane, Uxbridge UB8 3PH, UK;
| | - Xinli Du
- Department of Mechanical and Aerospace Engineering, College of Engineering Design and Physical Sciences, Brunel University, Kingston Lane, Uxbridge UB8 3PH, UK; (R.M.); (X.D.)
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Fatone S, Caldwell R, Angelico J, Stine R, Kim KY, Gard S, Oros M. Comparison of Ischial Containment and Subischial Sockets on Comfort, Function, Quality of Life, and Satisfaction With Device in Persons With Unilateral Transfemoral Amputation: A Randomized Crossover Trial. Arch Phys Med Rehabil 2021; 102:2063-2073.e2. [PMID: 34214499 DOI: 10.1016/j.apmr.2021.05.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 05/20/2021] [Accepted: 05/27/2021] [Indexed: 11/16/2022]
Abstract
OBJECTIVE To compare comfort and functional performance of the Northwestern University Flexible Subischial Vacuum (NU-FlexSIV) Socket with the ischial containment (IC) socket in persons with unilateral transfemoral amputation. DESIGN Randomized crossover trial with two 7-week periods. SETTING Private prosthetic clinics and university research laboratory. PARTICIPANTS A total of 30 enrolled (N=30); 25 participants completed the study with full (n=18) or partial data (n=7). INTERVENTIONS Two custom-fabricated sockets (IC and NU-FlexSIV), worn full-time for 7 weeks, with testing at 1, 4, and 7 weeks after socket delivery. MAIN OUTCOME MEASURES The primary outcome was change in Socket Comfort Score (SCS) at 7 weeks. Secondary outcomes at 7 weeks included the Orthotic and Prosthetic Users' Survey (OPUS) to assess lower extremity functional status, health-related quality of life, and satisfaction with device, as well as the 5-Times Rapid Sit-to-Stand Test, Four Square Step Test, and T-Test of Agility to assess functional performance. RESULTS At 7 weeks, the mean SCS for IC (7.0±1.7) and NU-FlexSIV (8.4±1.1) Sockets were significantly different (P<.001; 95% confidence interval, 0.8-2.3). Results from a linear mixed-effects model, accounting for data from all time points, indicated that the SCS was 1.7 (SE=0.45) points higher for the NU-FlexSIV Socket (P<.001). For the secondary outcomes, only OPUS satisfaction with device was significantly better in the NU-FlexSIV Socket after accounting for all data points. CONCLUSIONS The results suggest that after 7 weeks' accommodation, the NU-FlexSIV Socket was more comfortable and led to greater satisfaction with device than the IC socket in persons with unilateral transfemoral amputation and K3/K4 mobility. Other patient-reported outcomes and function were no different between sockets.
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Affiliation(s)
- Stefania Fatone
- Department of Physical Medicine and Rehabilitation, Northwestern University, Feinberg School of Medicine, Chicago, IL.
| | - Ryan Caldwell
- Department of Physical Medicine and Rehabilitation, Northwestern University, Feinberg School of Medicine, Chicago, IL; Scheck and Siress Prosthetics and Orthotics, Chicago, IL; Hanger Clinic, Austin, TX
| | - John Angelico
- Scheck and Siress Prosthetics and Orthotics, Chicago, IL; Hanger Clinic, Austin, TX
| | | | - Kwang-Youn Kim
- Department of Preventive Medicine, Northwestern University, Feinberg School of Medicine, Chicago, IL
| | - Steven Gard
- Department of Physical Medicine and Rehabilitation, Northwestern University, Feinberg School of Medicine, Chicago, IL; Jesse Brown VA Medical Center, Chicago, IL
| | - Michael Oros
- Scheck and Siress Prosthetics and Orthotics, Chicago, IL; Hanger Clinic, Austin, TX
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13
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Seth M, Beisheim EH, Spencer MT, Horne JR, Sarlo FB, Sions JM. Self-reported socket comfort, mobility, and balance-confidence of individuals with transtibial amputation using pinlock vs suction suspension. Prosthet Orthot Int 2021; 45:214-220. [PMID: 33840751 PMCID: PMC8169564 DOI: 10.1097/pxr.0000000000000007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 10/10/2020] [Indexed: 02/03/2023]
Abstract
BACKGROUND Improper suspension between the residual limb and prosthesis can result in pistoning, which may compromise skin integrity and reduce overall user comfort. In addition to objective measures of limb pistoning, user perspective may provide insight into suspension system effectiveness. OBJECTIVES The primary objective of this analysis was to explore differences in self-reported measures among adults with transtibial amputation (TTA) using pinlock vs suction suspension systems. STUDY DESIGN This is a secondary analysis of cross-sectional data. METHODS Participants (n = 48) were included if they (1) were ≥18 years of age, (2) were community-dwelling, (3) had a unilateral TTA of ≥6 months, and (4) were prescribed a prosthesis with either pinlock or suction suspension. Participants completed self-reported measures evaluating socket comfort (Socket Comfort Score [SCS]), prosthesis-enabled mobility (Prosthesis Evaluation Questionnaire-Mobility Section [PEQ-MS]; Locomotor Capabilities Index [LCI]), and balance-confidence (Activities-Specific Balance Confidence Scale [ABC]). RESULTS Participants using suction suspension reported significantly higher SCS as compared with participants using pinlock suspension (P ≤ .001). No differences were observed between groups for PEQ-MS, LCI, and/or ABC. CONCLUSIONS Individuals with TTA using suction suspension may report greater socket comfort than peers using pinlock suspension, but prosthesis-enabled mobility and balance-confidence may be similar. Future research is warranted to confirm these preliminary findings using a prospective, crossover study design that controls for all suspected factors that might influence socket comfort.
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Affiliation(s)
- Mayank Seth
- University of Delaware, Department of Physical Therapy, Newark, DE
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14
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Hobusch GM, Döring K, Brånemark R, Windhager R. Advanced techniques in amputation surgery and prosthetic technology in the lower extremity. EFORT Open Rev 2020; 5:724-741. [PMID: 33204516 PMCID: PMC7608512 DOI: 10.1302/2058-5241.5.190070] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Bone-anchored implants give patients with unmanageable stump problems hope for drastic improvements in function and quality of life and are therefore increasingly considered a viable solution for lower-limb amputees and their orthopaedic surgeons, despite high infection rates.Regarding diversity and increasing numbers of implants worldwide, efforts are to be supported to arrange an international bone-anchored implant register to transparently overview pros and cons.Due to few, but high-quality, articles about the beneficial effects of targeted muscle innervation (TMR) and regenerative peripheral nerve interface (RPNI), these surgical techniques ought to be directly transferred into clinical protocols, observations and routines.Bionics of the lower extremity is an emerging cutting-edge technology. The main goal lies in the reduction of recognition and classification errors in changes of ambulant modes. Agonist-antagonist myoneuronal interfaces may be a most promising start in controlling of actively powered ankle joints.As advanced amputation surgical techniques are becoming part of clinical routine, the development of financing strategies besides medical strategies ought to be boosted, leading to cutting-edge technology at an affordable price.Microprocessor-controlled components are broadly available, and amputees do see benefits. Devices from different manufacturers differ in gait kinematics with huge inter-individual varieties between amputees that cannot be explained by age. Active microprocessor-controlled knees/ankles (A-MPK/As) might succeed in uneven ground-walking. Patients ought to be supported to receive appropriate prosthetic components to reach their everyday goals in a desirable way.Increased funding of research in the field of prosthetic technology could enhance more high-quality research in order to generate a high level of evidence and to identify individuals who can profit most from microprocessor-controlled prosthetic components. Cite this article: EFORT Open Rev 2020;5:724-741. DOI: 10.1302/2058-5241.5.190070.
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Affiliation(s)
- Gerhard M Hobusch
- Medical University of Vienna, Department of Orthopaedics and Trauma Surgery, Vienna, Austria
| | - Kevin Döring
- Medical University of Vienna, Department of Orthopaedics and Trauma Surgery, Vienna, Austria
| | - Rickard Brånemark
- Gothenburg University, Gothenburg, Sweden.,Biomechatronics Group, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Reinhard Windhager
- Medical University of Vienna, Department of Orthopaedics and Trauma Surgery, Vienna, Austria
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15
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Youngblood RT, Hafner BJ, Czerniecki JM, Brzostowski JT, Allyn KJ, Sanders JE. Modeling the mechanics of elevated vacuum systems in prosthetic sockets. Med Eng Phys 2020; 84:75-83. [PMID: 32977925 DOI: 10.1016/j.medengphy.2020.07.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 07/24/2020] [Indexed: 10/23/2022]
Abstract
Elevated vacuum (EV) is suggested to improve suspension and limb volume management for lower limb prosthesis users. However, few guidelines have been established to facilitate configuration of EV sockets to ensure their safe and proper function. A benchtop model of an EV socket was created to study how prosthetic liner tensile elasticity, socket fit, and socket vacuum pressure affect liner displacement and subsequent pressure on the residual limb. A domed carbon fiber layup was used to represent an EV socket. Inserts were used to simulate various air gaps between the socket and liner. Various prosthetic liner samples were placed under the carbon fiber layup. Liner displacement and the corresponding pressure change underneath the liner were measured as vacuum was applied between the liner sample and socket wall. Tissue vacuum pressure increased linearly with socket vacuum pressure until the liner contacted the socket wall. Predicted tissue vacuum pressure matched well with experimental results. Findings suggest that the effect of vacuum pressure on the residual limb is primarily determined by air gap distance. The developed model may be used to assess effects of EV on residual limb tissues based on an individual's socket fit, liner characteristics, and applied vacuum. Understanding the physiological effects of EV on the residual limb could help practitioners avoid blister formation and improve EV implementation.
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Affiliation(s)
| | - Brian J Hafner
- Department of Rehabilitation Medicine, University of Washington, Seattle, WA, USA
| | - Joseph M Czerniecki
- Department of Rehabilitation Medicine, University of Washington, Seattle, WA, USA; VA Center for Limb Loss and Mobility, VA Puget Sound Health Care System, Seattle, WA, USA
| | | | - Katheryn J Allyn
- Department of Bioengineering, University of Washington, Seattle WA, USA
| | - Joan E Sanders
- Department of Bioengineering, University of Washington, Seattle WA, USA
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16
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Chadwell A, Diment L, Micó-Amigo M, Morgado Ramírez DZ, Dickinson A, Granat M, Kenney L, Kheng S, Sobuh M, Ssekitoleko R, Worsley P. Technology for monitoring everyday prosthesis use: a systematic review. J Neuroeng Rehabil 2020; 17:93. [PMID: 32665020 PMCID: PMC7362458 DOI: 10.1186/s12984-020-00711-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 06/23/2020] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Understanding how prostheses are used in everyday life is central to the design, provision and evaluation of prosthetic devices and associated services. This paper reviews the scientific literature on methodologies and technologies that have been used to assess the daily use of both upper- and lower-limb prostheses. It discusses the types of studies that have been undertaken, the technologies used to monitor physical activity, the benefits of monitoring daily living and the barriers to long-term monitoring, with particular focus on low-resource settings. METHODS A systematic literature search was conducted in PubMed, Web of Science, Scopus, CINAHL and EMBASE of studies that monitored the activity of prosthesis users during daily-living. RESULTS Sixty lower-limb studies and 9 upper-limb studies were identified for inclusion in the review. The first studies in the lower-limb field date from the 1990s and the number has increased steadily since the early 2000s. In contrast, the studies in the upper-limb field have only begun to emerge over the past few years. The early lower-limb studies focused on the development or validation of actimeters, algorithms and/or scores for activity classification. However, most of the recent lower-limb studies used activity monitoring to compare prosthetic components. The lower-limb studies mainly used step-counts as their only measure of activity, focusing on the amount of activity, not the type and quality of movements. In comparison, the small number of upper-limb studies were fairly evenly spread between development of algorithms, comparison of everyday activity to clinical scores, and comparison of different prosthesis user populations. Most upper-limb papers reported the degree of symmetry in activity levels between the arm with the prosthesis and the intact arm. CONCLUSIONS Activity monitoring technology used in conjunction with clinical scores and user feedback, offers significant insights into how prostheses are used and whether they meet the user's requirements. However, the cost, limited battery-life and lack of availability in many countries mean that using sensors to understand the daily use of prostheses and the types of activity being performed has not yet become a feasible standard clinical practice. This review provides recommendations for the research and clinical communities to advance this area for the benefit of prosthesis users.
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Affiliation(s)
| | - Laura Diment
- People Powered Prosthetics Group, University of Southampton, Southampton, UK
| | - M Micó-Amigo
- People Powered Prosthetics Group, University of Southampton, Southampton, UK
| | | | - Alex Dickinson
- People Powered Prosthetics Group, University of Southampton, Southampton, UK.
- Exceed Research Network, Exceed Worldwide, Lisburn, UK.
| | - Malcolm Granat
- University of Salford, Salford, UK
- Exceed Research Network, Exceed Worldwide, Lisburn, UK
| | - Laurence Kenney
- University of Salford, Salford, UK
- Exceed Research Network, Exceed Worldwide, Lisburn, UK
| | - Sisary Kheng
- University of Salford, Salford, UK
- Exceed Worldwide, Phnom Penh, Cambodia
| | | | | | - Peter Worsley
- People Powered Prosthetics Group, University of Southampton, Southampton, UK
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17
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Black RA, Houston G. 40th Anniversary Issue: Reflections on papers from the archive on "Rehabilitation Engineering". Med Eng Phys 2020; 72:72-73. [PMID: 31554580 DOI: 10.1016/j.medengphy.2019.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Richard A Black
- Department of Biomedical Engineering, University of Strathclyde, Glasgow, Scotland, UK.
| | - Gregor Houston
- Department of Biomedical Engineering, University of Strathclyde, Glasgow, Scotland, UK
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18
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McLean JB, Larsen BG, Weathersby EJ, Carter Bs RV, Allyn KJ, Garbini JL, Sanders JE. Fluid Volume Management in Prosthesis Users: Augmenting Panel Release with Pin Release. PM R 2020; 12:1236-1243. [PMID: 32103634 DOI: 10.1002/pmrj.12349] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 02/03/2020] [Accepted: 02/12/2020] [Indexed: 12/23/2022]
Abstract
BACKGROUND Management of fluid in the limbs is a challenge faced by people with disabilities. In prosthetics, a means for transtibial prosthesis users to stabilize their residual limb fluid volume during the day may improve socket fit. OBJECTIVE To determine if releasing the panels and locking pin of a cabled-panel adjustable socket during socket release significantly improved limb fluid volume recovery and retention over releasing the panels alone. DESIGN Repeated-measures experiment to assess the effects on limb fluid volume retention. SETTING Participants were tested in a laboratory setting while walking on a treadmill. INTERVENTION Release of a locking pin tether during sitting as a limb volume accommodation strategy. MAIN OUTCOME MEASURE Percent limb fluid volume retention for panel and pin release compared with panel release alone at 2 minutes (short term) and 50 minutes (long term) after subsequent activity. Limb fluid volume was monitored using bioimpedance analysis. RESULTS Median percent limb fluid volume retention for the panel and pin release was significantly greater than panel release alone for both anterior and posterior regions for the long term (P = .0499 and .0096, respectively) but not the short term (P = .0712 and .1580, respectively). CONCLUSION Augmenting panel release with pin release may be an effective accommodation strategy for prosthesis users with transtibial amputation to better retain limb fluid volume.
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Affiliation(s)
- Jake B McLean
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Brian G Larsen
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Ethan J Weathersby
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Ryan V Carter Bs
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Katheryn J Allyn
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Joseph L Garbini
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Joan E Sanders
- Department of Bioengineering, University of Washington, Seattle, WA, USA
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19
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Hinrichs P, Cagle JC, Sanders JE. A portable bioimpedance instrument for monitoring residual limb fluid volume in people with transtibial limb loss: A technical note. Med Eng Phys 2019; 68:101-107. [PMID: 31023596 DOI: 10.1016/j.medengphy.2019.04.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 03/04/2019] [Accepted: 04/03/2019] [Indexed: 10/27/2022]
Abstract
People with transtibial limb loss experience daily changes in volume of their residual limb that affect the fit of their prosthetic socket. A portable instrument was developed to monitor fluid volume changes outside of the laboratory setting. The bioimpedance system applied 26 current bursts per second at frequencies between 3 kHz and 1 MHz, and sensed voltage at up to six channels. Among six voltage-controlled current source circuits and five receive-channel amplifier topologies considered, a differential Howland current pump and a single receive-channel instrumentation amplifier proved the best combination of low noise and low power consumption. Mean RMS errors were 0.07% for extracellular fluid resistance, 2.23% for intracellular fluid resistance, and 1.15% for membrane capacitance.
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Affiliation(s)
- Paul Hinrichs
- Department of Bioengineering, University of Washington, 355061, 3720 15th Ave NE, Seattle WA 98195, United States
| | - John C Cagle
- Department of Bioengineering, University of Washington, 355061, 3720 15th Ave NE, Seattle WA 98195, United States
| | - Joan E Sanders
- Department of Bioengineering, University of Washington, 355061, 3720 15th Ave NE, Seattle WA 98195, United States.
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20
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Swanson E, Weathersby E, Cagle J, Sanders JE. Evaluation of Force Sensing Resistors for the Measurement of Interface Pressures in Lower Limb Prosthetics. J Biomech Eng 2019; 141:2732257. [PMID: 31017621 DOI: 10.1115/1.4043561] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Indexed: 12/14/2022]
Abstract
Understanding pressure distributions at the limb-socket interface is essential to the design and evaluation of prosthetic components for lower limb prosthesis users. Force sensing resistors (FSRs) are employed in prosthetics research to measure pressure at this interface due to their low cost, thin profile, and ease of use. While FSRs are known to be sensitive to many sources of error, few studies have systematically quantified these errors using test conditions relevant to lower limb prosthetics. The purpose of this study was to evaluate FSR accuracy for the measurement of lower limb prosthetics interface pressures. Two FSR models (Flexiforce A201 and Interlink 402) were subjected to a series of prosthetic-relevant tests. These tests included: (1) static compression, (2) cyclic compression, and (3) a combined static and cyclic compression protocol mimicking a variable activity (Walk-Sit-Stand) procedure. Flexiforce sensors outperformed Interlink sensors and were then subjected to two additional tests: (4) static curvature and (5) static shear stress. Results demonstrated that FSRs experienced significant errors all five tests. We concluded that: (1) if used carefully, FSRs can provide an estimate of prosthetic interface pressure, but these measurements should be interpreted within the expected range of possible measurement error given the setup; (2) FSRs should be calibrated in a setup that closely matches how they will be used for taking measurements; and (3) both Flexiforce and Interlink sensors can be used to estimate interface pressures, however in most cases Flexiforce sensors are likely to provide more accurate measurements.
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Affiliation(s)
- Eric Swanson
- Department of Bioengineering, University of Washington, Seattle, WA 98195
| | - Ethan Weathersby
- Department of Bioengineering, University of Washington, Seattle, WA 98195
| | - John Cagle
- Department of Bioengineering, University of Washington, Seattle, WA 98195
| | - Joan E Sanders
- Department of Bioengineering, University of Washington, Seattle, WA 98195
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21
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Sanders JE, Youngblood RT, Hafner BJ, Ciol MA, Allyn KJ, Gardner D, Cagle JC, Redd CB, Dietrich CR. Residual limb fluid volume change and volume accommodation: Relationships to activity and self-report outcomes in people with trans-tibial amputation. Prosthet Orthot Int 2018; 42:415-427. [PMID: 29402170 PMCID: PMC7447528 DOI: 10.1177/0309364617752983] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND Fluctuations in limb volume degrade prosthesis fit and require users to accommodate changes using management strategies, such as donning and doffing prosthetic socks. OBJECTIVES To examine how activities and self-report outcomes relate to daily changes in residual limb fluid volume and volume accommodation. STUDY DESIGN Standardized, two-part laboratory protocol with an interim observational period. METHODS Participants were classified as "accommodators" or "non-accommodators," based on self-report prosthetic sock use. Participants' residual limb fluid volume change was measured using a custom bioimpedance analyzer and a standardized in-laboratory activity protocol. Self-report health outcomes were assessed with the Socket Comfort Score and Prosthesis Evaluation Questionnaire. Activity was monitored while participants left the laboratory for at least 3 h. They then returned to repeat the bioimpedance test protocol. RESULTS Twenty-nine people were enrolled. Morning-to-afternoon percent limb fluid volume change per hour was not strongly correlated to percent time weight-bearing or to self-report outcomes. As a group, non-accommodators ( n = 15) spent more time with their prosthesis doffed and reported better outcomes than accommodators. CONCLUSION Factors other than time weight-bearing may contribute to morning-to-afternoon limb fluid volume changes and reported satisfaction with the prosthesis among trans-tibial prosthesis users. Temporary doffing may be a more effective and satisfying accommodation method than sock addition. Clinical relevance Practitioners should be mindful that daily limb fluid volume change and prosthesis satisfaction are not dictated exclusively by activity. Temporarily doffing the prosthesis may slow daily limb fluid volume loss and should be investigated as an alternative strategy to sock addition.
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22
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Cagle JC, Reinhall PG, Allyn KJ, McLean J, Hinrichs P, Hafner BJ, Sanders JE. A finite element model to assess transtibial prosthetic sockets with elastomeric liners. Med Biol Eng Comput 2018; 56:1227-1240. [PMID: 29235055 PMCID: PMC5999538 DOI: 10.1007/s11517-017-1758-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2017] [Accepted: 11/20/2017] [Indexed: 11/24/2022]
Abstract
People with transtibial amputation often experience skin breakdown due to the pressures and shear stresses that occur at the limb-socket interface. The purpose of this research was to create a transtibial finite element model (FEM) of a contemporary prosthesis that included complete socket geometry, two frictional interactions (limb-liner and liner-socket), and an elastomeric liner. Magnetic resonance imaging scans from three people with characteristic transtibial limb shapes (i.e., short-conical, long-conical, and cylindrical) were acquired and used to develop the models. Each model was evaluated with two loading profiles to identify locations of focused stresses during stance phase. The models identified five locations on the participants' residual limbs where peak stresses matched locations of mechanically induced skin issues they experienced in the 9 months prior to being scanned. The peak contact pressure across all simulations was 98 kPa and the maximum resultant shear stress was 50 kPa, showing reasonable agreement with interface stress measurements reported in the literature. Future research could take advantage of the developed FEM to assess the influence of changes in limb volume or liner material properties on interface stress distributions. Graphical abstract Residual limb finite element model. Left: model components. Right: interface pressures during stance phase.
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Affiliation(s)
- John C Cagle
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Per G Reinhall
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Kate J Allyn
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Jake McLean
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Paul Hinrichs
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Brian J Hafner
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Joan E Sanders
- Department of Bioengineering, University of Washington, Seattle, WA, USA.
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23
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Goldstein MD, Cagle JC, Hafner BJ, Allyn KJ, Sanders JE. Retracting Locking-Pin Mechanism That Allows Partial Prosthetic Socket Doffing during Sitting. JOURNAL OF PROSTHETICS AND ORTHOTICS : JPO 2018; 30:114-118. [PMID: 29910592 PMCID: PMC6000825 DOI: 10.1097/jpo.0000000000000178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Affiliation(s)
| | - John C Cagle
- Department of Bioengineering, University of Washington
| | - Brian J Hafner
- Department of Rehabilitation Medicine, University of Washington
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