A novel modelling and simulation method of hip joint surface contact stress

Figures & data

Figure 1. Coordinate system of hip joint model.

Figure 2. CE angle measurement.

Figure 3. Finite element modeling process.

Figure 4. Finite element model of the hip joint.

Table 1. Peak stress of different CE angle femoral head surface under different load direction.

θCE=50°		θCE=40°		θCE=30°		θCE=20°		θCE=10°
α/°	pmax/MPa	α/°	pmax/MPa	α/°	pmax/MPa	α/°	pmax/MPa	α/°	pmax/MPa
50	6.6267	—	—	—	—	—	—	—	—
40	5.3350	40	6.2362	—	—	—	—	—	—
30	4.0552	30	5.5851	30	5.4777	—	—	—	—
20	3.7235	20	4.1964	20	4.5185	20	6.2275	—	—
10	3.5930	10	3.5512	10	3.9340	10	5.2382	10	6.8989
0	3.3823	0	3.6331	0	3.6511	0	4.9581	0	4.6097
−10	3.1417	−10	3.7278	−10	3.7802	−10	4.1990	−10	4.0628
−20	3.0415	−20	3.3861	−20	3.4105	−20	4.2246	−20	4.2321
−30	3.2665	−30	3.2475	−30	3.1417	−30	3.4431	−30	3.4669
−40	2.8177	−40	3.4230	−40	2.9128	−40	2.9789	−40	2.9675

Figure 5. Contrast of simulation results (actual value) and calculated results (theoretical value) in the mathematical model.

Figure 6. von Mises stress diagram in the articular surface of the hip joint. (A) von Mises stress diagram in the articular surface of the hip joint with the θ_CE = 50° and ${\displaystyle \alpha }$ = 0°; (B) von Mises stress diagram in the articular surface of the hip joint with the θ_CE = 40° and ${\displaystyle \alpha }$ = −30°; (C) von Mises stress diagram in the articular surface of the hip joint with the θ_CE = 30° and ${\displaystyle \alpha }$ = −40°; (D) von Mises stress diagram in the articular surface of the hip joint with the θ_CE =30° and ${\displaystyle \alpha }$ = −50°; (E) von Mises stress diagram in the articular surface of the hip joint with the θ_CE = 20° and ${\displaystyle \alpha }$ =10°; (F) von Mises stress diagram in the articular surface of the hip joint with the θ_CE = 10° and ${\displaystyle \alpha }$ = −60°.