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Niger J Clin Pract. 2019 Sep;22(9):1276-1280. doi: 10.4103/njcp.njcp_141_19.

Finite element analysis on the hollow porous design at the proximal end of cementless femoral prosthesis stem.

Author information

1
Department of Orthopaedics, Taixing People's Hospital, Taixing, PR China.
2
Department of Orthopaedics, Jinling Clinical Medical College, Nanjing Medical University, Nanjing, Jiangsu, PR China.

Abstract

Aims:

The present study aims to improve the design of cementless femoral prosthesis stem and achieve better bone ingrowth and long-term stability.

Materials and Methods:

Four models with different directional hollow holes at the proximal end of femoral prosthesis were designed and finite element analysis was applied to calculate the magnitude of conducting force within the differently angled holes and the stress distribution of the femur and prosthesis.

Results:

Holes in prostheses make no difference on the stress values of femoral inner walls. The conducting forces in models trepanned on the lateral plane were 6.60N (0° pore) and 8.40N (45° pore) while forces in models trepanned on the anterior-posterior planes were 0.45N (upper 0° pore), 0.48N (lower 0° pore) and 1.57N (upper 45° pore), 1.51N (lower 45° pore), respectively.

Conclusion:

The position and direction of hollow holes influenced the conducting force in holes but had no influence on stress values of femoral inner walls. Prostheses with one 45° hole trepanned on the lateral plane of proximal prostheses presented best in elevating conducting force.

KEYWORDS:

Femoral prosthesis stem; finite element analysis; hollow hole; stress shielding; total hip replacement

PMID:
31489866
DOI:
10.4103/njcp.njcp_141_19
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