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Peer-reviewedCC BY 4.0PLOS One

Normal values of femoral head coverage angles on three-dimensional computed tomography images

  • Seohyun Choi1
  • Seon Min Lee2
  • Young Jae Kim3
  • Yong-Cheol Yoon4
  • Kwang Gi Kim5
5 affiliations
  1. 1Department of Medicine, College of Medicine, Gachon University, Incheon, Republic of Korea
  2. 2Medical Devices R&D Center, Gachon University Gil Medical Center, Incheon, Republic of Korea
  3. 3Department of Biohealth & Medical Engineering, Gachon University, Seongnam-si, Gyeonggi-do, Republic of Korea
  4. 4Biomedical & Convergence Institute, Gil Medical Center, Gachon University, Incheon, Republic of Korea
  5. 5Orthopedic Trauma Division, Trauma Center, Gachon University College of Medicine, Namdong-gu, Incheon, Republic of Korea
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Abstract

Introduction: Identifying novel diagnostic parameters is essential to address the inaccuracies related to femoral head coverage angle measurements using conventional methods. This study aimed to propose new femoral head coverage landmarks on 3D pelvic CT images in a Korean population and to present reference values based on these landmarks. Methods: This single-center retrospective cohort study defined the center, lateral, anterior, and posterior margins of the acetabulum from three-dimensional (3D) pelvic computed tomography (CT) scans of healthy Korean individuals. The lateral center-edge angle (LCEA), anterior center-edge angle (ACEA), posterior center-edge angle (PCEA), anterior acetabular sector angle (AASA), and posterior acetabular sector angle (PASA) were measured in 3D space. Results: The normal values for 3D LCEA in Korean males and females were 34.8° (SD = 8.3°) and 32.0° (SD = 6.9°), respectively. The 3D angles measured showed significant variations according to sex and age, with center-edge angles (LCEA, ACEA, and PCEA) generally increasing with age, whereas sector angles (AASA and PASA) showed a decreasing trend. Conclusion: The standardized values and statistical findings based on sex and age provided in this study offer valuable references for guiding surgical interventions in the acetabulum. Also, the proposed method yielded more likely to be reliable results than traditional two-dimensional methods with substantial differences.

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Cite

BibTeXRIS
BibTeX
@article{choi2026normal,
  title = {{Normal values of femoral head coverage angles on three-dimensional computed tomography images}},
  author = {Seohyun Choi and Seon Min Lee and Young Jae Kim and Yong-Cheol Yoon and Kwang Gi Kim},
  journal = {PLOS One},
  year = {2026},
  month = oct,
  doi = {10.1371/journal.pone.0347008},
  url = {https://doi.org/10.1371/journal.pone.0347008},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Normal values of femoral head coverage angles on three-dimensional computed tomography images
AU  - Seohyun Choi
AU  - Seon Min Lee
AU  - Young Jae Kim
AU  - Yong-Cheol Yoon
AU  - Kwang Gi Kim
PY  - 2026
DA  - 2026/10/07
JO  - PLOS One
DO  - 10.1371/journal.pone.0347008
UR  - https://doi.org/10.1371/journal.pone.0347008
AB  - Introduction: Identifying novel diagnostic parameters is essential to address the inaccuracies related to femoral head coverage angle measurements using conventional methods. This study aimed to propose new femoral head coverage landmarks on 3D pelvic CT images in a Korean population and to present reference values based on these landmarks. Methods: This single-center retrospective cohort study defined the center, lateral, anterior, and posterior margins of the acetabulum from three-dimensional (3D) pelvic computed tomography (CT) scans of healthy Korean individuals. The lateral center-edge angle (LCEA), anterior center-edge angle (ACEA), posterior center-edge angle (PCEA), anterior acetabular sector angle (AASA), and posterior acetabular sector angle (PASA) were measured in 3D space. Results: The normal values for 3D LCEA in Korean males and females were 34.8° (SD = 8.3°) and 32.0° (SD = 6.9°), respectively. The 3D angles measured showed significant variations according to sex and age, with center-edge angles (LCEA, ACEA, and PCEA) generally increasing with age, whereas sector angles (AASA and PASA) showed a decreasing trend. Conclusion: The standardized values and statistical findings based on sex and age provided in this study offer valuable references for guiding surgical interventions in the acetabulum. Also, the proposed method yielded more likely to be reliable results than traditional two-dimensional methods with substantial differences.
SN  - 1932-6203
ER  -