Spatial micromovements of uncemented femoral components after torsional loads.

A novel method is presented which permits to assess implanted femoral components with regards to location of fixation and initial stability under cyclic torsional loads. The measurement apparatus tracks the spatial movement at several sites of stem and bone, allowing quantitative analysis of the micromotions and twisting of stem and bone, and the location of torque (force) transfer. Four types of prostheses were compared, which revealed striking differences in torque transfer. Our results for synthetic femurs are consistent with in vivo data on the osseointegration and radiolucensies observed for the stem types of this study. The method can be used to quantitatively compare various stem designs and implantation techniques.

[1]  G. Bergmann,et al.  Hip joint loading during walking and running, measured in two patients. , 1993, Journal of biomechanics.

[2]  S. Romagnoli,et al.  CLS press-fit total hip arthroplasty , 1991 .

[3]  G L Kinzel,et al.  Measurement of the total motion between two body segments. I. Analytical development. , 1972, Journal of biomechanics.

[4]  J. M. Lee,et al.  Observations on the Effect of Movement on Bone Ingrowth into Porous‐Surfaced Implants , 1986, Clinical orthopaedics and related research.

[5]  John A. Anderson,et al.  Hydroxyapatite‐Coated Hip Prostheses: Early Results From an International Study , 1995, Clinical orthopaedics and related research.

[6]  P S Walker,et al.  Strains and micromotions of press-fit femoral stem prostheses. , 1987, Journal of biomechanics.

[7]  J J Callaghan,et al.  The effect of femoral stem geometry on interface motion in uncemented porous-coated total hip prostheses. Comparison of straight-stem and curved-stem designs. , 1992, The Journal of bone and joint surgery. American volume.

[8]  P. Rossi,et al.  Short‐Term Results of Hydroxyapatite‐Coated Primary Total Hip Arthroplasty , 1995, Clinical orthopaedics and related research.

[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]  H P Chandler,et al.  Intraoperative measurement of rotational stability of femoral components of total hip arthroplasty. , 1991, Clinical orthopaedics and related research.

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

[12]  L. Whiteside,et al.  The effect of collar and distal stem fixation on micromotion of the femoral stem in uncemented total hip arthroplasty. , 1989, Clinical orthopaedics and related research.

[13]  L. Whiteside,et al.  Torsional fixation of a modular femoral hip component. , 1993, Clinical orthopaedics and related research.

[14]  H J Wilke,et al.  [Non-contact measuring of small translations and rotations in all degrees of displacement]. , 1991, Biomedizinische Technik. Biomedical engineering.

[15]  Millard F. Beatty,et al.  Kinematics of Finite, Rigid-Body Displacements , 1966 .

[16]  P. Manley,et al.  Fixation stability of femoral components in a canine hip replacement model , 1992, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

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

[18]  A. Cappello,et al.  Mechanical validation of whole bone composite tibia models. , 2000, Journal of biomechanics.

[19]  P. Ducheyne,et al.  Influence of a functional dynamic loading on bone ingrowth into surface pores of orthopedic implants. , 1977, Journal of biomedical materials research.

[20]  G Selvik,et al.  Instability of total hip prostheses at rotational stress. A roentgen stereophotogrammetric study. , 1984, Acta orthopaedica Scandinavica.

[21]  W. Maloney,et al.  In vitro study of initial stability of a conical collared femoral component. , 1992, The Journal of arthroplasty.

[22]  E P Lautenschlager,et al.  A computer-based biomechanical analysis of the three-dimensional motion of cementless hip prostheses. , 1992, Journal of biomechanics.

[23]  C. Engh,et al.  Torsional fixation of the femoral component in total hip arthroplasty. The effect of surgical press-fit technique. , 1992, Clinical orthopaedics and related research.

[24]  E Schneider,et al.  Experimental method for the in vitro testing of the initial stability of cementless hip prostheses. , 1989, Journal of biomechanics.

[25]  D. Gebauer,et al.  Micromotions in the primary fixation of cementless femoral stem prostheses , 2004, Archives of Orthopaedic and Trauma Surgery.

[26]  P S Walker,et al.  Relative motion of hip stems under load. An in vitro study of symmetrical, asymmetrical, and custom asymmetrical designs. , 1994, The Journal of bone and joint surgery. American volume.