Large interfacial gaps between the stem and the bone in cementless total hip arthroplasty may prevent successful bone ingrowth at the sites, and can also be a passage for wear particles. Furthermore, interfacial gaps between the stem and the bone are believed to compromise the primary stability of the implant. Thus, a broaching method that serves to reduce gaps is expected to give clinically preferable results. A modified broach system with a canal guide is introduced to enhance the accuracy of femoral canal shaping in comparison with the conventional broach system for a Versys™ fibermetal taper stem. The primary stability of the hip systems and the ratios of the stem surface in contact with the femur were measured in a composite femur model. With the conventional method, an average of 67% of the stem surface was shown to be in contact with the bone, and an average stem micromotion/migration of was observed under of stair climbing loads. With the modified method, the stem-bone contact ratio significantly increased to 82% , and the average micromotion/migration reduced to , respectively ( for migration). Our finite element models of the hip systems supported that the difference in micromotion could be attributed to the difference in interfacial contact. Interfacial gaps occurring with the conventional broach system were effectively reduced by the proposed method, resulting in improved primary stability.
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April 2008
Research Papers
Primary Stability of Cementless Stem in THA Improved With Reduced Interfacial Gaps
Youngbae Park,
Youngbae Park
Department of Mechanical Engineering,
Korea Advanced Institute of Science and Technology
, Daejeon, 305-701, Republic of Korea
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HoChul Shin,
HoChul Shin
Intelligent Robot Research Division,
Electronics and Telecommunications Research Institute
, Daejeon, 305-700, Republic of Korea
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DonOk Choi,
DonOk Choi
Department of Mechanical Engineering,
Korea Advanced Institute of Science and Technology
, Daejeon, 305-701, Republic of Korea
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Carolyne Albert,
Carolyne Albert
Department of Materials Engineering, and Department of Orthopaedics,
University of British Columbia
, 2329 West Mall, Vancouver, BC, V6T 1Z4, Canada
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Yong-San Yoon
Yong-San Yoon
Professor
Department of Mechanical Engineering,
e-mail: ysyoon@kaist.ac.kr
Korea Advanced Institute of Science and Technology
, Daejeon, 305-701, Republic of Korea
Search for other works by this author on:
Youngbae Park
Department of Mechanical Engineering,
Korea Advanced Institute of Science and Technology
, Daejeon, 305-701, Republic of Korea
HoChul Shin
Intelligent Robot Research Division,
Electronics and Telecommunications Research Institute
, Daejeon, 305-700, Republic of Korea
DonOk Choi
Department of Mechanical Engineering,
Korea Advanced Institute of Science and Technology
, Daejeon, 305-701, Republic of Korea
Carolyne Albert
Department of Materials Engineering, and Department of Orthopaedics,
University of British Columbia
, 2329 West Mall, Vancouver, BC, V6T 1Z4, Canada
Yong-San Yoon
Professor
Department of Mechanical Engineering,
Korea Advanced Institute of Science and Technology
, Daejeon, 305-701, Republic of Koreae-mail: ysyoon@kaist.ac.kr
J Biomech Eng. Apr 2008, 130(2): 021008 (7 pages)
Published Online: March 28, 2008
Article history
Received:
August 16, 2006
Revised:
June 25, 2007
Published:
March 28, 2008
Citation
Park, Y., Shin, H., Choi, D., Albert, C., and Yoon, Y. (March 28, 2008). "Primary Stability of Cementless Stem in THA Improved With Reduced Interfacial Gaps." ASME. J Biomech Eng. April 2008; 130(2): 021008. https://doi.org/10.1115/1.2898761
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