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- W1995129416 abstract "Bone loss in the proximal femur at the time of revision hip arthroplasty for a failed primary cemented femoral component can substantially reduce the stability of the revision stem, Use of an extended-length femoral component has been suggested to aid in achieving long-term fixation; however, the optimal stem length is unknown, A three-dimensional finite element model of a charnley-type revision femoral component in a sclerotic shell of cortical bone devoid of cancellous bone was developed, and five different stem lengths ranting from 140 to 273 mm were used. The interface between the sclerotic bone and cement mantle consisted of fibrous tissue. Distal to the sclerotic bone, bonding was allowed between the cement and bone. Relative motion between the cement and bone was reduced substantially when the stem extended beyond the original defect. Maximum principal stresses in the proximal cement mantle decreased from 7.7 to 5.5 MPa, but cement stresses near the distal tip increased from 7.9 to 10.7 MPa when the stem just bridged the defect. Further increases in stem length reduced the distal cement stresses. Increases beyond two femoral diameters had a minor effect on changes in relative motion, cement mantle stresses, and stresses across the cement-bone interface. The results suggest that a femoral component that extends beyond the area of cancellous bone defect by two femoral diameters will be most effective in minimizing stresses and motion that could be associated with clinical loosening of the cemented revision. A shorter stem that just bridges the cancellous bone defect left from the primary procedure may not provide adequate distal fixation due to high cement-bone shear stresses." @default.
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- W1995129416 date "1997-01-01" @default.
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- W1995129416 title "Effects of stem length on mechanics of the femoral hip component after cemented revision" @default.
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- W1995129416 doi "https://doi.org/10.1002/jor.1100150110" @default.
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