{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,11]],"date-time":"2026-04-11T12:11:02Z","timestamp":1775909462298,"version":"3.50.1"},"reference-count":51,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2025,5,27]],"date-time":"2025-05-27T00:00:00Z","timestamp":1748304000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"ESKAS Swiss Excellence Scholarship"},{"name":"\u201cFondation pour la recherche ost\u00e9o-articulaire\u201d of Geneva"},{"name":"Division of Orthopaedic Surgery and Musculoskeletal Trauma Care of the Geneva University Hospitals"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Hip flexion range of motion (ROM) during gait is an important surgery outcome for patients undergoing total hip arthroplasty (THA) that could help patient monitoring and rehabilitation. To allow systematic measurements during patients\u2019 clinical pathways, hip ROM measurement should be as simple and cheap as possible to ensure patient and clinician acceptance. Single IMU options can match these requirements and offer measurements both during daily living conditions and standardized clinical tests (e.g., 10 m walk, timed up-and-go). However, single-IMU approaches to measure hip ROM have been limited. Thus, the objective of this study was to explore the accuracy of one IMU in measuring hip ROM during gait and to determine whether a single-IMU approach can provide results comparable to those of multi-IMU systems. To assess this, machine learning models were employed, ranging from the simplest (linear regression) to more complex approaches (artificial neural networks). Eighteen patients undergoing THA and seven controls were measured using a 3D opto-electronic motion capture system and one thigh-mounted IMU. Hip ROM was predicted from thigh ROM using regression and classification models and was compared to the reference hip ROM. Multiple regression was the best-performing model, with limits of agreement (LoA) of \u00b113\u00b0 and a systematic bias of 0. Random forest, RNN, GRU and LSTM models yielded LoA ranges &gt; 27.8\u00b0, exceeding the threshold of acceptable error. These results showed that one IMU can measure hip ROM with errors comparable to those of two-IMU methods, with potential for improvement. Using multiple linear regression was sufficient and more appropriate than employing complex ANN models. This approach offers simplicity and acceptance to users in clinical settings.<\/jats:p>","DOI":"10.3390\/s25113363","type":"journal-article","created":{"date-parts":[[2025,5,27]],"date-time":"2025-05-27T09:29:36Z","timestamp":1748338176000},"page":"3363","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Validity of a Single Inertial Measurement Unit to Measure Hip Range of Motion During Gait in Patients Undergoing Total Hip Arthroplasty"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-7570-0466","authenticated-orcid":false,"given":"Noor","family":"Alalem","sequence":"first","affiliation":[{"name":"Kinesiology Laboratory, Geneva University Hospitals and University of Geneva, 1205 Geneva, Switzerland"},{"name":"Center of Research on Skeletal Muscle and Movement, Geneva University Hospitals and University of Geneva, 1205 Geneva, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8617-6522","authenticated-orcid":false,"given":"Xavier","family":"Gasparutto","sequence":"additional","affiliation":[{"name":"Kinesiology Laboratory, Geneva University Hospitals and University of Geneva, 1205 Geneva, Switzerland"},{"name":"Center of Research on Skeletal Muscle and Movement, Geneva University Hospitals and University of Geneva, 1205 Geneva, Switzerland"},{"name":"Division of Orthopaedics and Traumatology, Faculty of Medicine, Geneva University Hospitals, 1205 Geneva, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8698-3268","authenticated-orcid":false,"given":"Kevin","family":"Rose-Dulcina","sequence":"additional","affiliation":[{"name":"Kinesiology Laboratory, Geneva University Hospitals and University of Geneva, 1205 Geneva, Switzerland"},{"name":"Center of Research on Skeletal Muscle and Movement, Geneva University Hospitals and University of Geneva, 1205 Geneva, Switzerland"},{"name":"Division of Orthopaedics and Traumatology, Faculty of Medicine, Geneva University Hospitals, 1205 Geneva, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0066-3253","authenticated-orcid":false,"given":"Peter","family":"DiGiovanni","sequence":"additional","affiliation":[{"name":"Division of Orthopaedics and Traumatology, Faculty of Medicine, Geneva University Hospitals, 1205 Geneva, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2060-2394","authenticated-orcid":false,"given":"Didier","family":"Hannouche","sequence":"additional","affiliation":[{"name":"Division of Orthopaedics and Traumatology, Faculty of Medicine, Geneva University Hospitals, 1205 Geneva, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9144-4982","authenticated-orcid":false,"given":"St\u00e9phane","family":"Armand","sequence":"additional","affiliation":[{"name":"Kinesiology Laboratory, Geneva University Hospitals and University of Geneva, 1205 Geneva, Switzerland"},{"name":"Center of Research on Skeletal Muscle and Movement, Geneva University Hospitals and University of Geneva, 1205 Geneva, Switzerland"},{"name":"Division of Orthopaedics and Traumatology, Faculty of Medicine, Geneva University Hospitals, 1205 Geneva, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,5,27]]},"reference":[{"key":"ref_1","unstructured":"U.S. Food and Drug Administration (2024, March 06). 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