Influence of stem geometry on mechanics of cemented femoral hip components with a proximal bond

Nonlinear, three‐dimensional, finite element models of cemented femoral hip components with a proximal stem‐Cement bond were developed with use of a Charnley stem geometry and a modified Charnley stem geometry that had a cylindrical cross section over the distal two‐thirds of the stem (Distal‐Round). Peak tensile stresses in the proximal cement mantle increased 63 and 74% for the Charnley and Distal‐Round stems, respectively, when the proximal stem‐cement interface was debonded, The shear stresses over the stem‐cement interface with a proximal bond were 29%. larger for the Distal‐Round stem than for the Charnley stem. After the proximal stem‐cement interface was debonded. the peak tensile stresses in the cement mantle were 15% larger for the Distal‐Round stem than for the Charnley stem. The results illustrate that stresses within the proximal cement mantle could be substantially reduced for both Charnley and Distal‐Round stems through use of a proximal stem‐cement bond. However, the risk of debonding may be higher for the Distal‐Round stem because of increased shear stresses, and once debonded the risk of further loosening due to failure of the cement mantle would also be higher for the Distal‐Round stem.

[1]  W. Hozack,et al.  Failure of the cement-bone interface. A consequence of strengthening the cement-prosthesis interface? , 1994, The Journal of bone and joint surgery. British volume.

[2]  T P Harrigan,et al.  A three-dimensional non-linear finite element study of the effect of cement-prosthesis debonding in cemented femoral total hip components. , 1991, Journal of biomechanics.

[3]  R M Rose,et al.  Global mechanical consequences of reduced cement/bone coupling rigidity in proximal femoral arthroplasty: a three-dimensional finite element analysis. , 1988, Journal of biomechanics.

[4]  H Weinans,et al.  Trends of mechanical consequences and modeling of a fibrous membrane around femoral hip prostheses. , 1990, Journal of biomechanics.

[5]  R. Crowninshield,et al.  Cement strain measurement surrounding loose and well-fixed femoral component stems. , 1983, Journal of biomedical materials research.

[6]  D. Bartel,et al.  Fundamental load transfer patterns for press-fit, surface-treated intramedullary fixation stems. , 1994, Journal of biomechanics.

[7]  W. Krause,et al.  Fatigue properties of acrylic bone cements: review of the literature. , 1988, Journal of biomedical materials research.

[8]  W J Maloney,et al.  Histomorphological studies of the long-term skeletal responses to well fixed cemented femoral components. , 1990, The Journal of bone and joint surgery. American volume.

[9]  C. Colwell,et al.  The femoral component in total hip arthroplasty. Six to eight-year follow-up of one hundred consecutive patients after use of a third-generation cementing technique. , 1994, The Journal of bone and joint surgery. American volume.

[10]  D L Bartel,et al.  Coulomb frictional interfaces in modeling cemented total hip replacements: a more realistic model. , 1995, Journal of biomechanics.

[11]  S. Woolson,et al.  Primary Total Hip Replacement with Insertion of an Acetabular Component without Cement and a Femoral Component with Cement. Follow-up Study at an Average of Six Years* , 1996, The Journal of bone and joint surgery. American volume.

[12]  D T Davy,et al.  Telemetric force measurements across the hip after total arthroplasty. , 1988, The Journal of bone and joint surgery. American volume.

[13]  R. Huiskes The various stress patterns of press-fit, ingrown, and cemented femoral stems. , 1990, Clinical orthopaedics and related research.

[14]  T M Keaveny,et al.  Effects of porous coating and collar support on early load transfer for a cementless hip prosthesis. , 1993, Journal of biomechanics.

[15]  H Weinans,et al.  Effects of material properties of femoral hip components on bone remodeling , 1992, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[16]  J. Callaghan,et al.  Early loosening of the femoral component at the cement-prosthesis interface after total hip replacement. , 1995, The Journal of bone and joint surgery. American volume.

[17]  A Rohlmann,et al.  Is staircase walking a risk for the fixation of hip implants? , 1995, Journal of biomechanics.