Effects of distal cement voids on cement stress in total hip arthroplasty |
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| Institution: | 1. Department of Orthopedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA;2. Department of Orthopedic Surgery, Brigham and Women''s Hospital, Harvard Medical School, Boston, MA, USA;1. School of Chemistry and Chemical Engineering, Guangxi MinZu University, Nanning 530006, China;2. Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission; Guangxi Key Laboratory of Chemistry and Engineering of Forest Products/Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, Guangxi Minzu University, Nanning 530006, China |
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| Abstract: | The purpose of this study was to determine whether voids in the distal cement mantle created during total hip arthroplasty increase cement stress at the distal tip of the femoral component. Using a three-dimensional finite element model of an idealized, cylindrical femoral shaft with implanted prosthesis, peak von Mises stress in the cement mantle was evaluated for five different air-bubble configurations and two cement mantle thicknesses, 2 mm and 5 mm. Results indicated that voids in the cement mantle increased peak cement stress at the medial tip of the prosthesis by 2% to 57%, with greater increases in stress being evident with larger bubble sizes. On the average, peak stresses were 53% greater in the models with the thinner cement mantle. Clinicians are encouraged to use a thicker cement mantle and to avoid bubble formation during total hip arthroplasty. |
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