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2004, Number 2

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Rev Mex Ing Biomed 2004; 25 (2)

Design optimization of femoral component of a non-conventional blocked hip prosthesis

Domínguez HVM, Rico MG, Urriolagoitia CG

Language: Spanish
References: 35
Page: 144-159
PDF size: 353.25 Kb.


ABSTRACT

Non-conventional prosthesis (NCP) is employed for proximal end of femur reconstruction after resection of bony tumors of the hip. We developed a novel design of NCP, which main limitation is its lack of stability. In this work we determined design parameters that improve its stability, by means of finite element analysis. The model geometry was established by means of tomographic scans practiced to a cadaveric femur. It was developed seven cases. In the first two cases position of pins with respect to osteotomy site is determined. In the third case length of stem is analyzed. In the fifth case we studied the effect of external ring, meanwhile the sixth case analyzed the effect of restore abductor lever, and the last one studies three materials commonly used for implants. The design obtained presents proximal pin 50 mm from osteotomy, distal pin from 25 mm from proximal one; stem with a length of 30 cm, upper end of femur with the original design; with external ring, and 100% of abductor lever restoration; finaly, we chose stainless steel for this implant.


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