Femoral surface strain in intact composite femurs: a custom computer analysis of the photoelastic coating technique

Understanding how forces are distributed through the proximal femur has many clinical applications for surgeons, researchers, and prosthetic designers. A new system for two-dimensional analysis of femoral surface strain was developed and applied to intact composite femurs. The photoelastic coating method was used to resolve the surface strain under axial loading, and strain analysis was performed using digital imaging of the strain patterns and original computer programs. The technique provides qualitative and quantitative data that describes overall femoral surface strains more completely than previous point analysis and strain gauge techniques. Results from repeated testing found the photoelastic process, computer imaging and computer analysis of strain areas to be statistically repeatable.

[1]  D. Hungerford,et al.  Strain Analysis of the Proximal Femur After Total Hip Replacement , 1987 .

[2]  P S Walker,et al.  Design and fabrication of cementless hip stems. , 1988, Clinical orthopaedics and related research.

[3]  J B Finlay,et al.  In vitro analysis of proximal femoral strains using PCA femoral implants and a hip-abductor muscle simulator. , 1989, The Journal of arthroplasty.

[4]  P S Walker,et al.  Effect of press-fit femoral stems on strains in the femur. A photoelastic coating study. , 1990, The Journal of arthroplasty.

[5]  J. Szivek,et al.  Comparison of the deformation response of synthetic and cadaveric femora during simulated one-legged stance. , 1991, Journal of applied biomaterials : an official journal of the Society for Biomaterials.

[6]  R. Bourne,et al.  An evaluation of three loading configurations for the in vitro testing of femoral strains in total hip arthroplasty , 1991, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[7]  D R Sumner,et al.  Experimental studies of bone remodeling in total hip arthroplasty. , 1992, Clinical orthopaedics and related research.

[8]  P S Walker,et al.  A comparison of cortical strain after cemented and press‐fit proximal and distal femoral replacement , 1992, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[9]  W H Harris,et al.  Quantification of Implant Micromotion, Strain Shielding, and Bone Resorption With Porous‐Coated Anatomic Medullary Locking Femoral Prostheses , 1992, Clinical orthopaedics and related research.

[10]  R. Huiskes,et al.  The relationship between stress shielding and bone resorption around total hip stems and the effects of flexible materials. , 1992, Clinical orthopaedics and related research.

[11]  J. Galante,et al.  Determinants of stress shielding: design versus materials versus interface. , 1992, Clinical orthopaedics and related research.

[12]  C. Engh,et al.  Producing and avoiding stress shielding. Laboratory and clinical observations of noncemented total hip arthroplasty. , 1992, Clinical orthopaedics and related research.

[13]  L. Whiteside,et al.  The effect of axial and torsional loading on strain distribution in the proximal femur as related to cementless total hip arthroplasty. , 1993, Clinical orthopaedics and related research.

[14]  L. Whiteside,et al.  Strain distribution in the proximal femur with flexible composite and metallic femoral components under axial and torsional loads. , 1993, Journal of biomedical materials research.

[15]  W H Harris,et al.  High assembly strains and femoral fractures produced during insertion of uncemented femoral components. A cadaver study. , 1993, The Journal of arthroplasty.

[16]  Angelo Cappello,et al.  Experimental errors in the application of photoelastic coatings on human femurs with uncemented hip stems , 1994 .

[17]  J. Hua,et al.  Closeness of fit of uncemented stems improves the strain distribution in the femur , 1995, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[18]  J. Fetto,et al.  Reexamination of hip biomechanics during unilateral stance. , 1995, American journal of orthopedics.

[19]  Wilson C. Hayes,et al.  Basic Orthopaedic Biomechanics , 1995 .

[20]  L Cristofolini,et al.  Mechanical validation of whole bone composite femur models. , 1996, Journal of biomechanics.

[21]  F. Guilak,et al.  Effects of coronally slotted femoral prostheses on cortical bone strain. , 1997, The Journal of arthroplasty.

[22]  L Cristofolini,et al.  A critical analysis of stress shielding evaluation of hip prostheses. , 1997, Critical reviews in biomedical engineering.

[23]  F. Guilak,et al.  The effect of hip stem material modulus on surface strain in human femora. , 1998, Journal of biomechanics.

[24]  L Cristofolini,et al.  In vitro stress shielding measurements can be affected by large errors. , 1999, The Journal of arthroplasty.