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Updated: Apr 17, 2026

Imaging of the Microstructural Failure Mechanism in the Human Hip
Published on: September 29, 2023
Finite element modelling for assessing effect of acetabular component orientation on the basic stress path above
Yong Nie1, Fu-xing Pei, Zong-ming Li
1Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, China.
Objective:
To investigate the effect of acetabular component orientation on the basic stress path above the acetabular dome in the recommended safe zone.
Methods:
A subject-specific normal hip finite element model was generated and a convergence study carried out to determine the number of material properties for trabecular bone using a normal hip model. Four abduction angles (35°, 40°, 45° and 50°) and four anteversion angles (10°, 15°, 20° and 25°) from the recommended safe zone of acetabular cup orientation were chosen to simulate acetabular reconstruction. The distribution and level of periacetabular stress was assessed using a normal hip model as a control and 16 reconstructed acetabula in simulated single-legged stances.
Results:
The error of the average stress between plans four and five (50 and 100 materials for trabecular bone respectively) was 4.8%, which is less than the previously defined 5% error. The effect of acetabular component orientation on stress distribution in trabecular bone was not pronounced. When the acetabular component was at 15° anteversion and the abduction angle was 40° or 45°, the stress level on posterolateral cortical bone above the acetabular dome was as stable as that in the normal hip model.
Conclusions:
Acetabular component orientation affects the basic stress path above the acetabular dome. Thus, orientation should be considered when attempting to restore normal biomechanics in the main load-bearing area.
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