{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:41:15Z","timestamp":1760240475377,"version":"build-2065373602"},"reference-count":37,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2019,7,4]],"date-time":"2019-07-04T00:00:00Z","timestamp":1562198400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003451","name":"Euskal Herriko Unibertsitatea","doi-asserted-by":"publisher","award":["GIU18\/162"],"award-info":[{"award-number":["GIU18\/162"]}],"id":[{"id":"10.13039\/501100003451","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003086","name":"Eusko Jaurlaritza","doi-asserted-by":"publisher","award":["PRE2016-2-0236"],"award-info":[{"award-number":["PRE2016-2-0236"]}],"id":[{"id":"10.13039\/501100003086","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003329","name":"Ministerio de Econom\u00eda y Competitividad","doi-asserted-by":"publisher","award":["DPI2017-82694-R"],"award-info":[{"award-number":["DPI2017-82694-R"]}],"id":[{"id":"10.13039\/501100003329","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000780","name":"European Commission","doi-asserted-by":"publisher","award":["PN\/TG1\/UNSW\/PhD\/18\/2017"],"award-info":[{"award-number":["PN\/TG1\/UNSW\/PhD\/18\/2017"]}],"id":[{"id":"10.13039\/501100000780","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In rehabilitation procedures related to the lower limbs, gait monitoring is an important source of information for the therapist. However, many of the approaches proposed in the literature require the use of uncomfortable and invasive devices. In this work, an instrumented tip is developed and detailed, which can be connected to any crutch. The instrumented tip provides objective data of the crutch motion, which, combined with patient movement data, might be used to monitor the daily activities or assess the recovery status of the patient. For that purpose, the tip integrates a two-axis inclinometer, a tri-axial gyroscope, and a force sensor to measure the force exerted on the crutch. In addition, a novel algorithm to estimate the pitch angle of the crutch is developed. The proposed approach is tested experimentally, obtaining acceptable accuracies and demonstrating the validity of the proposed lightweight, portable solution for gait monitoring.<\/jats:p>","DOI":"10.3390\/s19132944","type":"journal-article","created":{"date-parts":[[2019,7,4]],"date-time":"2019-07-04T11:13:18Z","timestamp":1562238798000},"page":"2944","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Instrumented Crutch Tip for Monitoring Force and Crutch Pitch Angle"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1670-8076","authenticated-orcid":false,"given":"I\u00f1igo","family":"Sesar","sequence":"first","affiliation":[{"name":"Department of Systems Engineering and Automation, University of the Basque Country UPV\/EHU, 48013 Bilbao, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6049-2308","authenticated-orcid":false,"given":"Asier","family":"Zubizarreta","sequence":"additional","affiliation":[{"name":"Department of Systems Engineering and Automation, University of the Basque Country UPV\/EHU, 48013 Bilbao, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1949-953X","authenticated-orcid":false,"given":"Itziar","family":"Cabanes","sequence":"additional","affiliation":[{"name":"Department of Systems Engineering and Automation, University of the Basque Country UPV\/EHU, 48013 Bilbao, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1026-3248","authenticated-orcid":false,"given":"Eva","family":"Portillo","sequence":"additional","affiliation":[{"name":"Department of Systems Engineering and Automation, University of the Basque Country UPV\/EHU, 48013 Bilbao, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2379-0546","authenticated-orcid":false,"given":"Jon","family":"Torres-Unda","sequence":"additional","affiliation":[{"name":"Department of Physiology, University of the Basque Country UPV\/EHU, 48940 Leioa, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0923-0788","authenticated-orcid":false,"given":"Ana","family":"Rodriguez-Larrad","sequence":"additional","affiliation":[{"name":"Department of Physiology, University of the Basque Country UPV\/EHU, 48940 Leioa, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2019,7,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"867","DOI":"10.1016\/S0003-9993(99)90076-X","article-title":"Correlates of life satisfaction among persons with spinal cord injury","volume":"80","author":"Dijkers","year":"1999","journal-title":"Arch. 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