He S, Zhu J, Zhao J
Department of Orthopaedics, Taixing People's Hospital, Taixing, PR China.
Department of Orthopaedics, Jinling Clinical Medical College, Nanjing Medical University, Nanjing, Jiangsu, PR China.
Niger J Clin Pract. 2019 Sep;22(9):1276-1280. doi: 10.4103/njcp.njcp_141_19.
The present study aims to improve the design of cementless femoral prosthesis stem and achieve better bone ingrowth and long-term stability.
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.
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.
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.
本研究旨在改进非骨水泥型股骨假体柄的设计，以实现更好的骨长入和长期稳定性。
设计了四种在股骨假体近端具有不同方向空心孔的模型，并应用有限元分析来计算不同角度孔内的传导力大小以及股骨和假体的应力分布。
假体上的孔对股骨内壁的应力值没有影响。在侧平面开孔的模型中的传导力分别为6.60N（0°孔）和8.40N（45°孔），而在前-后平面开孔的模型中的力分别为0.45N（上0°孔）、0.48N（下0°孔）以及1.57N（上45°孔）、1.51N（下45°孔）。
空心孔的位置和方向影响孔内的传导力，但对股骨内壁的应力值没有影响。在近端假体侧平面开一个45°孔的假体在提高传导力方面表现最佳。
