@article{horsak_3d_2021, title = {{3D} free-hand ultrasound to register anatomical landmarks at the pelvis and localize the hip joint center in lean and obese individuals}, volume = {11}, copyright = {Open Access}, issn = {2045-2322}, url = {https://www.nature.com/articles/s41598-021-89763-7}, doi = {https://doi.org/10.1038/s41598-021-89763-7}, abstract = {3D free-hand ultrasound (3DFUS) is becoming increasingly popular to assist clinical gait analysis because it is cost- and time-efficient and does not expose participants to radiation. The aim of this study was to evaluate its reliability in localizing the anterior superior iliac spine (ASIS) at the pelvis and the hip joint centers (HJC). Additionally, we evaluated its accuracy to get a rough estimation of the potential to use of 3DFUS to segment bony surface. This could offer potential to register medical images to motion capture data in future. To evaluate reliability, a test–retest study was conducted in 16 lean and 19 obese individuals. The locations of the ASIS were determined by manual marker placement (MMP), an instrumented pointer technique (IPT), and with 3DFUS. The HJC location was also determined with 3DFUS. To quantify reliability, intraclass correlation coefficients (ICCs), the standard error of measurement (SEm), among other statistical parameters, were calculated for the identified locations between the test and retest. To assess accuracy, the surface of a human plastic pelvic phantom was segmented with 3DFUS in a distilled water bath in 27 trials and compared to a 3D laser scan of the pelvis. Regarding reliability, the MMP, but especially the IPT showed high reliability in lean (SEm: 2–3 mm) and reduced reliability in obese individuals (SEm: 6–15 mm). Compared to MMP and IPT, 3DFUS presented lower reliability in the lean group (SEm: 2–4 mm vs. 2–8 mm, respectively) but slightly better values in the obese group (SEm: 7–11 mm vs. 6–16 mm, respectively). Correlations between test–retest reliability and torso body fat mass (\% of body mass) indicated a moderate to strong relationship for MMP and IPT but only a weak correlation for the 3DFUS approach. The water-bath experiments indicated an acceptable level of 3.5 (1.7) mm of accuracy for 3DFUS in segmenting bone surface. Despite some difficulties with single trials, our data give further rise to the idea that 3DFUS could serve as a promising tool in future to inform marker placement and hip joint center location, especially in groups with higher amount of body fat.}, language = {en}, number = {1}, urldate = {2021-05-20}, journal = {Scientific Reports}, author = {Horsak, Brian and Schwab, Caterine and Durstberger, Sebastian and Thajer, Alexandra and Greber-Platzer, Susanne and Kainz, Hans and Jonkers, Ilse and Kranzl, Andreas}, year = {2021}, note = {Projekt: HIPstar}, keywords = {3D Free Hand Ultrasound, Biomechanics, Center for Digital Health Innovation, Center for Digital Health and Social Innovation, DHLab, Department Gesundheit, Gait Analysis, Institut für Gesundheitswissenschaften, Open Access, SP CDHSI Motor Rehabilitation, Studiengang Physiotherapie, Wiss. Beitrag, best, best-bhorsak, peer-reviewed}, pages = {10650}, } @inproceedings{schwab_evaluating_2020, address = {Virtual Meeting}, title = {Evaluating the accuracy of a {3D} free-hand ultrasound technique for bone segmentation in clinical gait analysis}, url = {http://www.sciencedirect.com/science/article/pii/S0966636220304513}, doi = {10.1016/j.gaitpost.2020.08.064}, language = {en}, urldate = {2020-09-14}, booktitle = {Gait \& {Posture}}, author = {Schwab, C. and Durstberger, S. and Kranzl, A. and Simonlehner, M. and Kainz, H. and Horsak, B.}, year = {2020}, note = {Projekt: HIPstar}, keywords = {3D Free Hand Ultrasound, Biomechanics, Center for Digital Health Innovation, Center for Digital Health and Social Innovation, DHLab, Department Gesundheit, Digital Health, Eintrag überprüfen, Gait Analysis, Institut für Gesundheitswissenschaften, Poster, SP CDHSI Motor Rehabilitation, SP IGW Clinical \& Healthcare Research, Studiengang Physiotherapie, Wiss. Beitrag, best, best-bhorsak, peer-reviewed}, } @inproceedings{schwab_anwendung_2020, address = {München, Deutschland}, title = {Die {Anwendung} von {3D}-{Freihand}-{Ultraschall} für die digitale {Rekonstruktion} von anatomischen {Strukturen} in der {3D} {Ganganalyse}: erste {Ergebnisse} eines laufenden {Projekts}}, booktitle = {Abstractband des 3. {GAMMA} {Kongress}}, author = {Schwab, Caterine and Durstberger, Sebastian and Kranzl, Andreas and Horsak, Brian}, year = {2020}, note = {Projekt: HIPstar Projekt: DHLab}, keywords = {3D Free Hand Ultrasound, Biomechanics, Center for Digital Health Innovation, Center for Digital Health and Social Innovation, Department Gesundheit, Gait Analysis, Institut für Gesundheitswissenschaften, Publikationstyp Präsentation, Publikationstyp Schriftpublikation, SP CDHSI Motor Rehabilitation, SP IGW Clinical \& Healthcare Research, Studiengang Physiotherapie, Vortrag, Wiss. Beitrag, best, best-bhorsak, peer-reviewed, ⛔ No DOI found}, } @inproceedings{durstberger_evaluating_2020, address = {Virtual Meeting}, title = {Evaluating {3D} free-hand ultrasound as an alternative approach to register anatomical landmarks: {A} test-retest study in lean and overweight participants}, shorttitle = {Evaluating {3D} free-hand ultrasound as an alternative approach to register anatomical landmarks}, doi = {10/gnt2tf}, language = {en}, urldate = {2020-09-14}, booktitle = {Gait \& {Posture}}, author = {Durstberger, S. and Schwab, C. and Simonlehner, M. and Kainz, H. and Kranzl, A. and Horsak, B.}, year = {2020}, note = {Projekt: HIPstar}, keywords = {3D Free Hand Ultrasound, Biomechanics, Center for Digital Health Innovation, Center for Digital Health and Social Innovation, DHLab, Department Gesundheit, Digital Health, Eintrag überprüfen, Gait Analysis, Green OA, Institut für Gesundheitswissenschaften, Institutional Access, Poster, SP CDHSI Motor Rehabilitation, SP IGW Clinical \& Healthcare Research, Studiengang Physiotherapie, Wiss. Beitrag, best, best-bhorsak, peer-reviewed}, }