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Change of the Cement Mantle Thickness According to the Movement of the Femoral Stem in THRA  

Park, Yong-Kuk (대구가톨릭대학교 기계자동차공학부)
Kim, Jin-Gon (대구가톨릭대학교 기계자동차공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.24, no.2, 2007 , pp. 140-148 More about this Journal
Abstract
THRA(Total Hip Replacement Arthroplasty) has been widely used for several decades as a viable treatment of otherwise-unsolved hip problems. In THRA surgery, cement mantle thickness is critical to long-term implant survival of femoral stem fixed with cement. Numerous studies reported thin or incomplete cement mantle causes osteolysis, loosening, and the failure of implant. To analyze the effect of femoral stem rotation on cement thickness, in this study, we select two most popular stems used in THRA. Using CAD models obtained from a 3D scanner, we measure the cement mantle thickness developed by the rotation of a femoral stem in the virtual space created by broaching. The study shows that as the femoral stem deviates from the target coordinates, the minimum thickness of cement decreases. Therefore, we recommend development of a new methodology for accurate insertion of a femoral stem along the broached space. Also, modification of the stem design robust to the unintentional movement of a femoral stem in the broached space, can alleviate the problem.
Keywords
Total Hip Replacement Arthroplasty; Femoral Stem; Cement Mantle Thickness; CAD Model; 3D Scanner;
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