{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T04:29:47Z","timestamp":1769833787650,"version":"3.49.0"},"reference-count":23,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2021,5,28]],"date-time":"2021-05-28T00:00:00Z","timestamp":1622160000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100010661","name":"Horizon 2020 Framework Programme","doi-asserted-by":"publisher","award":["825429"],"award-info":[{"award-number":["825429"]}],"id":[{"id":"10.13039\/100010661","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>There is a current healthcare need for improved prosthetic socket fit provision for the masses using low-cost and simple to manufacture sensors that can measure pressure, shear, and friction. There is also a need to address society\u2019s increasing concerns regarding the environmental impact of electronics and IoT devices. Prototype thin, low-cost, and low-weight pressure, shear, and loss of friction sensors have been developed and assembled for trans-femoral amputees. These flexible and conformable sensors are simple to manufacture and utilize more enviro-friendly novel magnetite-based QTSS\u2122 (Quantum Technology Supersensor\u2122) quantum materials. They have undergone some initial tests on flat and curved surfaces in a pilot amputee trial, which are presented in this paper. These initial findings indicate that the prototype pressure sensor strip is capable of measuring pressure both on flat and curved socket surfaces in a pilot amputee trial. They have also demonstrated that the prototype shear sensor can indicate increasing shear forces, the resultant direction of the shear forces, and loss of friction\/slippage events. Further testing, amputee trials, and ongoing optimization is continuing as part of the SocketSense project to assist prosthetic comfort and fit.<\/jats:p>","DOI":"10.3390\/s21113764","type":"journal-article","created":{"date-parts":[[2021,5,31]],"date-time":"2021-05-31T03:45:29Z","timestamp":1622432729000},"page":"3764","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Development of Prototype Low-Cost QTSS\u2122 Wearable Flexible More Enviro-Friendly Pressure, Shear, and Friction Sensors for Dynamic Prosthetic Fit Monitoring"],"prefix":"10.3390","volume":"21","author":[{"given":"Valter","family":"Dejke","sequence":"first","affiliation":[{"name":"RISE Research Institutes of Sweden, Argongatan 30, 431 53 M\u00f6lndal, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mattias P.","family":"Eng","sequence":"additional","affiliation":[{"name":"RISE Research Institutes of Sweden, Argongatan 30, 431 53 M\u00f6lndal, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Klas","family":"Brinkfeldt","sequence":"additional","affiliation":[{"name":"RISE Research Institutes of Sweden, Argongatan 30, 431 53 M\u00f6lndal, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Josephine","family":"Charnley","sequence":"additional","affiliation":[{"name":"Lusstech, NETpark, Thomas Wright Way, Sedgefield TS21 3FD, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Lussey","sequence":"additional","affiliation":[{"name":"Lusstech, NETpark, Thomas Wright Way, Sedgefield TS21 3FD, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chris","family":"Lussey","sequence":"additional","affiliation":[{"name":"Lusstech, NETpark, Thomas Wright Way, Sedgefield TS21 3FD, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"145","DOI":"10.1177\/0309364620913459","article-title":"The effect of the transfemoral prosthetic socket interface designs on skeletal motion and socket comfort: A randomized clinical trial","volume":"44","author":"Kahle","year":"2020","journal-title":"Prosthet. Orthot. Int."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"422","DOI":"10.1016\/j.apmr.2007.11.005","article-title":"Estimating the Prevalence of Limb Loss in the United States: 2005 to 2050","volume":"89","author":"MacKenzie","year":"2008","journal-title":"Arch. Phys. Med. Rehabil."},{"key":"ref_3","unstructured":"Advanced Amputee Solutions Website (2021, April 01). Amputee Statistics You Ought to Know. Available online: https:\/\/advancedamputees.com\/amputee-statistics-you-ought-know."},{"key":"ref_4","first-page":"161","article-title":"State-of-the-art research in lower-limb prosthetic biomechanics-socket interface: A review","volume":"38","author":"Mak","year":"2001","journal-title":"J. Rehabil. Res. Dev."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1996","DOI":"10.1109\/TBME.2017.2775100","article-title":"Sockets for Limb Prostheses: A Review of Existing Technologies and Open Challenges","volume":"65","author":"Ibrahimi","year":"2018","journal-title":"IEEE Trans. Biomed. Eng."},{"key":"ref_6","unstructured":"O&P EDGE, and Amputee Coalition (2021, April 01). Amputee Patient Comfort and Compliance. inMotion, Available online: https:\/\/www.amputee-coalition.org\/wp-content\/uploads\/2015\/06\/lsp_opedge-survey-article_120115-113042.pdf."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"563","DOI":"10.1097\/00002060-200108000-00003","article-title":"Use and Satisfaction with Prosthetic Devices among Persons with Trauma-Related Amputations: A Long-Term Outcome Study","volume":"80","author":"Dillingham","year":"2001","journal-title":"Am. J. Phys. Med. Rehabil."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"74","DOI":"10.1016\/j.apmr.2008.07.015","article-title":"Determinants of Skin Problems of the Stump in Lower-Limb Amputees","volume":"90","author":"Meulenbelt","year":"2009","journal-title":"Arch. Phys. Med. Rehabil."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1919","DOI":"10.1016\/j.apmr.2012.04.024","article-title":"Qualitative Study of Prosthetic Suspension Systems on Transtibial Amputees\u2019 Satisfaction and Perceived Problems with Their Prosthetic Devices","volume":"93","author":"Ali","year":"2012","journal-title":"Arch. Phys. Med. Rehabil."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1016\/S0377-1237(17)30794-3","article-title":"Long Term Effects of Prostheses on Stump in Lower Limb Amputees: A Critical Analysis of 100 Cases","volume":"52","author":"Bhandari","year":"1996","journal-title":"Med. J. Armed Forces India"},{"key":"ref_11","unstructured":"(2021, April 01). IoT Tech News Website. Available online: https:\/\/iottechnews.com\/news\/2018\/sep\/28\/eight-technologies-are-changing-iot-and-how-they-can-benefit-you\/."},{"key":"ref_12","unstructured":"(2021, April 01). SocketSense Project Website. Available online: https:\/\/www.socketsense.eu\/2020\/05\/11\/new-quantum-materials-boosts-healthcare-iot-solution\/."},{"key":"ref_13","unstructured":"(2021, April 01). EPSRC Centre for Innovative Manufacturing in Large Area Electronics Website. Available online: http:\/\/largeareaelectronics.org\/what-is-large-area-electronics\/."},{"key":"ref_14","unstructured":"(2021, April 01). Quantum Technology Supersensors Website. Available online: https:\/\/www.quantumtechnologysupersensors.com\/index.html."},{"key":"ref_15","unstructured":"(2021, April 01). Wikipedia Website\u2014Sustainable Electronics. Available online: https:\/\/en.wikipedia.org\/wiki\/Sustainable_electronics."},{"key":"ref_16","unstructured":"(2021, April 01). Organic and Printed Electronics Association Website\u2014Sustainability. Available online: https:\/\/oe-a.org\/viewer\/-\/v2article\/render\/26786968."},{"key":"ref_17","unstructured":"World Commission on Environment and Development (1987). Our Common Future, Oxford University Press. The Brundtland Report."},{"key":"ref_18","unstructured":"(2021, April 01). SocketSense Project Website\u2014Whitepaper Sensors. Available online: https:\/\/www.socketsense.eu\/2020\/11\/25\/whitepaper-on-advanced-sensors\/."},{"key":"ref_19","unstructured":"\u00d6ssur Website (2021, April 01). Direct Socket TF. Available online: https:\/\/www.ossur.com\/en-us\/prosthetics\/sockets\/direct-socket-tf."},{"key":"ref_20","unstructured":"\u00d6ssur Website (2021, April 01). Reflex Rotate. Available online: https:\/\/www.ossur.com\/en-us\/prosthetics\/feet\/re-flex-rotate."},{"key":"ref_21","unstructured":"\u00d6ssur Website (2021, April 01). Rheo Knee XC. Available online: https:\/\/www.ossur.com\/en-gb\/prosthetics\/knees\/rheo-knee-xc."},{"key":"ref_22","unstructured":"\u00d6ssur Website (2021, April 01). ICEROSS Transfemoral Locking Liner. Available online: https:\/\/www.ossur.com\/en-us\/prosthetics\/liners\/iceross-transfemoral-locking."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"167","DOI":"10.1243\/0954411971534287","article-title":"Stump-socket interface pressure as an aid to socket design in prostheses for trans-femoral amputees\u2014A preliminary study","volume":"211","author":"Lee","year":"1997","journal-title":"Proc. Inst. Mech. Eng. 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