Titel
3D free-hand ultrasound to register anatomical landmarks at the pelvis and localize the hip joint center in lean and obese individuals
Autor*in
Brian Horsak
Institute of Health Sciences, St. Pölten University of Applied Sciences
Caterine Schwab
Institute of Health Sciences, St. Pölten University of Applied Sciences
Sebastian Durstberger
Laboratory of Gait and Movement Analysis, Orthopedic Hospital Vienna-Speising
... show all
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.
Stichwort
Biomedical engineeringBoneMedical researchOrthopaedicsSkeleton
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
Scientific Reports
Band
11
Ausgabe
1
ISSN
2045-2322
Erscheinungsdatum
2021
Publication
Springer Science and Business Media LLC
Projekt
Kod / Identifikator
P30923-B30
Erscheinungsdatum
2021
Zugänglichkeit
Rechte
Rechteangabe
© The Author(s) 2021
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