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Hip joint stress distribution changes depending on three-dimensional pelvic orientation: Finite-element analysis
Yumiko Ojima1, Yusuke Matsuura2, Sei Yano2
1Graduate School of Medicine, Chiba University, Chiba, Japan.
Summary
Posterior pelvic tilt, pelvic hike, and forward pelvic rotation increase stress on the anterosuperior acetabulum, potentially leading to hip overload. Posterior pelvic tilt showed the greatest impact on the hip joint.
Area of Science:
- Biomechanics
- Orthopedics
- Medical Imaging
Background:
- Pelvic orientation influences hip and spine alignment and joint function.
- While sagittal plane pelvic tilt is well-studied, coronal and horizontal plane orientations are less understood.
- Understanding 3D pelvic orientation is crucial for analyzing hip joint stress distribution.
Purpose of the Study:
- To investigate how three-dimensional pelvic orientation affects stress distribution in the intact hip joint.
- To identify specific pelvic orientations that lead to increased stress in the acetabulum.
Main Methods:
- Analysis of computed tomography data from five patients with unilateral pelvic girdle.
- Evaluation of thirteen models using MECHANICAL FINDER software.
- Assessment of stress in four acetabular regions under various pelvic orientations (tilt, hike, rotation).
Main Results:
- Posterior pelvic tilt (20°) significantly increased equivalent stress (1.51x) and maximum principal stress (1.57x) in the anterosuperior acetabulum.
- Pelvic hike (20°) and forward pelvic rotation (20°) also significantly increased maximum principal stress in the anterosuperior acetabulum (1.44x and 1.45x, respectively).
Conclusions:
- Local stress accumulates in the anterosuperior acetabulum during posterior pelvic tilt, pelvic hike, and forward pelvic rotation.
- These orientations may contribute to hip overload.
- Posterior pelvic tilt demonstrates a more pronounced effect on hip joint stress compared to pelvic hike or forward rotation.
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