Alternative Mechanical Evaluation Method for Ceramic Hip Joint Implants Utilizing Finite Element Analysis under in vivo-like Conditions
- Alternative Mechanical Evaluation Method for Ceramic Hip Joint Implants Utilizing Finite Element Analysis under in vivo-like Conditions
- 한성민; 추준욱; 송강일; 박성희; 최재봉; 박종웅; 최귀원; 윤인찬
- Total Hip Replacement; Ceramic Femoral Head; Finite Element Analysis; MEchanical Stability; In vivo-like Condition
- Issue Date
- Journal of Biomechanical Science and Engineering
- VOL 7, NO 4, 336-348
- This study proposes an alternative mechanical simulation protocol for ceramic
femoral heads under in vivo-like conditions. A 3D pelvis model is obtained from
CT images and the finite elements of the implanted models are validated based on
Kwong’s experimental results. The stress distribution of nine different femoral head
models is then compared when using the conventional proof test (standard ISO
7206-10) and proposed test protocol (postoperative models). Both test methods
show a decrease in the maximum stress when increasing the size of the femoral
head and bore depth. However, for the stress distribution, the postoperative models
reveal a concentration on the superior inner region of femoral head cranial, while
the proof test shows an axisymmetric shape in the tangential direction. As a
non-uniformed stress distribution increases the probability of fracture, the
mechanical testing of ceramic femoral heads should be considered under in
vivo-like conditions in order to improve the mechanical reliability of the joint.
Thus, the current results show the necessity and viability of an alternative
mechanical evaluation method for ceramic hip implants.
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