Retrospective Study
Copyright ©The Author(s) 2023.
World J Clin Cases. Oct 6, 2023; 11(28): 6733-6743
Published online Oct 6, 2023. doi: 10.12998/wjcc.v11.i28.6733
Figure 1
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Figure 1 Measurement diagrams of each angle.
Figure 2
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Figure 2 Radiographs of subchondral fatigue fracture of the femoral head. A: Precollapse stage; B: Subchondral fracture lines (arrowhead); C: Sclerotic margin below the fracture lines; D: Subchondral bone collapse; E: Subchondral bone defect; F: Osteoarthritis.
Figure 3
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Figure 3 Representative radiographs and magnetic resonance imaging images of subchondral fatigue fracture of the femoral head and osteonecrosis of the femoral head. A: Subchondral fracture lines (arrowhead); B and C: Hypointense signal in T1-weighted images; D: Hypointense signal with joint effusion in T2-weighted image; E: Subchondral fracture lines (arrowhead); F and G: Reactive interface line in T1-weighted image (arrow); H: Cystic degeneration in T2-weighted image (star).
Figure 4
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Figure 4 Logistic regression analysis of clinical factors. Odds ratio (OR) > 1 indicates that the variable might be a protective factor; OR < 1 indicates that the variable might be a risk factor. BMI: Body mass index.
Figure 5
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Figure 5 Logistic regression analysis of hip anatomy factors. Odds ratio (OR) > 1 indicates that the variable might be a protective factor; OR < 1 indicates that the variable might be a risk factor. AASA: Anterior acetabular sector angle; AVcen: Acetabular anteversion of the center of the acetabulum; AVsup: Acetabular anteversion of the superior acetabulum; IIA: Inferior iliac angle; IPA: Ischiopubic angle; NSA: Neck-shaft angle; PASA: Posterior acetabular sector angle; SASA: Superior acetabular sector angle.
Figure 6
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Figure 6 Receiver operating characteristic curves. A: Curve of anterior acetabular sector angle; B: Curve of acetabular anteversion of the center of the acetabulum. AUC: Area under the curve.
Figure 7
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Figure 7 Violin plot of anterior acetabular sector angle and acetabular anteversion of the center of the acetabulum comparing subchondral fatigue fracture of the femoral head with osteonecrosis of the femoral head. aP value < 0.0001. AASA: Anterior acetabular sector angle; AVcen: Acetabular anteversion of the center of the acetabulum; ONFH: Osteonecrosis of the femoral head; SFFFH: Subchondral fatigue fracture of the femoral head.