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Cited by 48Hip disorders and treatmentsLower Extremity Biomechanics and PathologiesOrthopaedic implants and arthroplasty

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Evaluation of translation in the normal and dysplastic hip using three-dimensional magnetic resonance imaging and voxel-based registration

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Akiyama, K., Sakai, T., Koyanagi, J., Yoshikawa, H., Sugamoto, K.·2011·Osteoarthritis and Cartilage
DOI 10.1016/j.joca.2011.01.017
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Abstract

Objective To elucidate in vivo hip instability by comparing normal hips to hips with acetabular dysplasia by evaluating three-dimensional (3D) translations of the femoral head center (FHC) at different hip positions using magnetic resonance imaging (MRI). Design Forty normal hips and 22 dysplastic female hips were examined. MRI was performed at four different positions bilaterally: neutral, 45° of flexion, 15° of extension, and the Patrick position. Femoral and pelvic bones were separately extracted at the neutral position and superimposed over the images of each different position using voxel-based registration. The distance between the acetabular center and FHC at neutral position was defined as 3D-migration. The distance between FHC at neutral position and that at each different position was defined as 3D-translation. Two-way repeated measures analysis of variance was performed to consider the dependency between right and left-side data, and multiple linear regression analyses were performed to assess independent relationships. Results The center-edge (CE) angle was the determinant for 3D-migration (β=-0.415, P=0.001), and there was a statistical significant difference in 3D-migration between normal female hips and dysplastic hips (P=0.047). From neutral to the Patrick position, the FHC of normal and dysplastic hips translated postero-infero-medially by 1.12±0.39mm (0.45-1.85mm) and 1.97±0.84mm (0.95-4.34mm), respectively, and the difference between the groups was statistically significant (P=0.005). CE angle was the determinant for 3D-translation from neutral to the Patrick position (β=-0.730, P<0.001). The average root mean square error in 3D-translation was 0.172mm and 0.193mm for intra- and interobserver reproducibility, respectively. Conclusions Hip instability was increased in proportion to the severity of acetabular dysplasia. A 3D MRI voxel-based registration technique can show in vivo morphology and kinematics of the native hip without exposure to radioactivity.

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  • Few studies have evaluated the in vivo dynamic instability in DDH during weight-bearing.

    “However, few studies have evaluated the in vivo dynamic instability in DDH during weight-bearing [1, 18].”

    From Femoral head translation in borderline and definite dysplastic hips during weight‐bearing: 2D/3D image registration analysis (2023) · cites this paper as [1]

    The Introduction says there have been few in vivo studies of hip instability, supporting the scarcity claim. The Discussion describes an earlier gait-cycle study, but does not establish that the few studies evaluated instability specifically during weight-bearing; it also says this paper's own MRI measurements were static and could not assess functional effects during daily activities. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

  • The values of femoral head translation during weight-bearing in DDH are similar to those reported in previous studies on dynamic instability of definite DDH.

    “In this study, the femoral head translation during weight-bearing in DDH ranged from 0.5 to 2.3 mm, similar values to those reported in previous studies on dynamic instability of definite DDH [1, 18].”

    From Femoral head translation in borderline and definite dysplastic hips during weight‐bearing: 2D/3D image registration analysis (2023) · cites this paper as [1]

    The Results report millimetre-scale femoral-head translation in dysplastic hips, including 0.76–2.39 mm from neutral to flexion. But the Discussion says the measurements came from static MRI positions and could not evaluate functional effects during daily activity. The paper therefore supports a similarity in magnitude, not translation measured during weight-bearing or dynamic instability. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

  • The CE angle was the determinant for 3D-translation from the neutral to the Patrick position in Akiyama et al., which coincides with our results for definite DDH.

    “The CE angle was the determinant for 3D-translation from the neutral to the Patrick position, which coincides with our results for definite DDH.”

    From Femoral head translation in borderline and definite dysplastic hips during weight‐bearing: 2D/3D image registration analysis (2023) · cites this paper as [1]

  • A sample of four borderline DDH and eight definite DDH cases is required to have 80% power to detect a true mean difference of 1 mm between groups, with a type I error probability of 0.05, assuming a standard deviation of 0.5 mm.

    “Consequently, if the true mean difference between the borderline DDH and definite DDH groups is 1 mm, a sample of four borderline DDH and eight definite DDH cases is required to have a statistical power of 80% to reject the null hypothesis that the population means of two groups are equal, with a type I error probability of 0.05.”

    From Femoral head translation in borderline and definite dysplastic hips during weight‐bearing: 2D/3D image registration analysis (2023) · cites this paper as [1]

    The Patients and study design section describes normal and dysplastic hips, not borderline and definite DDH groups. The Statistical analysis section sets a significance threshold of P < 0.05 but gives no power or sample-size calculation. Searches for the proposed group sizes, 1 mm difference, 80% power, and assumed 0.5 mm standard deviation found no passage addressing the claim. (LLM, conf=0.75)

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Metadata

Authors
Akiyama, K., Sakai, T., Koyanagi, J., Yoshikawa, H., & Sugamoto, K.
Affiliations
The University of Osaka (JP)
Corresponding author
Sakai, T.
ORCID
Venue
Osteoarthritis and Cartilage
Publisher
Elsevier BV
Published
2011-06
Volume
19
Issue
6
Pages
700-710
ISSN
1063-4584 (ISSN-L)
DOI
10.1016/j.joca.2011.01.017
OpenAlex
W2005893414
Cited by
48
References
0
Citations by year
2026: 4 · 2025: 3 · 2024: 5 · 2023: 2 · 2022: 6 · 2021: 1 · 2020: 8 · 2018: 3 · 2017: 2 · 2015: 3 · 2014: 2 · 2013: 4 · 2012: 3
FWCI
3.59
Type
journal article
Language
en
Open access
Licence
Locations
  • Osteoarthritis and Cartilage (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Japanese Grant-in-Aid for Scientific Research
  • Osaka gas group Welfare Foundation
Topics
  • Health Sciences › Medicine › Surgery › Hip disorders and treatments
  • Physical Sciences › Engineering › Biomedical Engineering › Lower Extremity Biomechanics and Pathologies
  • Health Sciences › Medicine › Surgery › Orthopaedic implants and arthroplasty
Keywords
hip instability, acetabular dysplasia, femoral head center, center-edge angle, hip kinematics, femoral head migration, voxel-based registration, 3D MRI
MeSH terms
Acetabulum, Adult, Biomechanical Phenomena, Female, Hip Dislocation, Humans, Joint Instability, Magnetic Resonance Imaging, Male, Imaging, Three-Dimensional

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