Analysis of cementless implants using interface nonlinear friction—Experimental and finite element studies

Dammak, M.; Shirazi-Adl, A.; Zukor, David J.

doi:10.1016/s0021-9290(96)00110-8

Cited by 42 publications

(32 citation statements)

References 19 publications

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“…Our recent model studies comparing the measured nonlinear curve with an idealized Coulomb one clearly suggest the shortcoming of the Coulomb's friction curve in simulating the porous-surfaced metal-bone interfaces. [21][22][23] As expected, the current friction coefficient at the CTR-bone interface is found to be similar to our reported results at the porous coated metal-bone interface. 17,18 The tests are performed with minimum delay after the dissection of each tibial specimen.…”

Section: Discussionsupporting

confidence: 89%

“…Our recent axisymmetric and three-dimensional model studies have further indicated the marked ef-fect of measured friction properties in the fixation mechanics of artificial joints. [21][22][23][24] In previous studies, only porous-surfaced fiber mesh and bead was used. 17,18 To investigate the effect of other developed surfaces on the friction properties, this study was set to perform the tests on four different metallic surfaces and to compare the results.…”

Section: Introductionmentioning

confidence: 99%

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Friction properties at the bone-metal interface: Comparison of four different porous metal surfaces

Dammak

Shirazi-Adl

Schwartz

et al. 1997

J. Biomed. Mater. Res.

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Detailed friction load-displacement response of four distinct metallic surfaces [one beaded porous metal (CTR) and three cast Co-Cr alloy ingrowth mesh surfaces, nonplanar mesh (INX), cast mesh 1 (CM1), and cast mesh 2 (CM2)] on poly-urethane and cancellous bone specimens of six tibiae were measured under different normal stresses (0.1, 0.15, or 0.025 MPa). Bone cubes were obtained from different proximal regions of resurfaced cadaveric tibiae. Both monotonic and cyclic fatigue loadings of up to 4000 cycles at 1 Hz were considered. Comparison of measured results indicated that the friction coefficient was not affected by the magnitude of normal stress and the bone excision site (medial, lateral, anterior, posterior, and central). The CM2 surface showed significantly greater resistance with friction coefficients of more than 0.9 for the bone and 0.8 for the polyurethane. The INX surface yielded the second largest resistance followed by CM1 and CTR surfaces. NO significant difference was found between these latter two surfaces. Fatigue tests of up to 4000 loading-unloading cycles showed about 10% reduction in friction coefficient for CTR and INX surfaces, while negligible reduction was found for CM1 and CM2 surfaces.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Friction properties at the bone-metal interface: Comparison of four different porous metal surfaces

Dammak

Shirazi-Adl

Schwartz

et al. 1997

J. Biomed. Mater. Res.

Self Cite

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“…However, the interface friction coefficients are lower for polyurethane-metal interfaces than for bone-metal interfaces. [42][43][44] Therefore, even though it does not represent a full replica of human femur, the synthetic femur seems a valuable model to compare the initial stability of different stem designs, as also asserted by several investigators. 14,18,45,46 Another clinical problem associated with total hip arthroplasty is stress shielding.…”

Section: Discussionmentioning

confidence: 98%

Initial stability of a new hybrid fixation hip stem: Experimental measurement of implant-bone micromotion under torsional load in comparison with cemented and cementless stems

Baleani

Cristofolini

Toni

2000

J. Biomed. Mater. Res.

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A new hybrid fixation stem, named cemented-locked uncemented (CLU), for total hip arthroplasty was developed to achieve good initial stability. Primary stability is guaranteed by the cement which is injected into two pockets in the lateral area. This leaves a large surface available for long-term biologic fixation (direct bone attachment on implant). This study evaluates in vitro the initial stability of the CLU prototype under torsional load, in comparison with cemented and cementless stems. The results show that the CLU stem is very stable in simulated stair climbing. Its micromotions are comparable to those of a cemented prosthesis, and significantly less (80-90% lower) than those for a cementless stem. These findings confirm the optimal initial stability expected from the CLU prototype. This new design, which employs hybrid fixation, should improve bone formation on the implant and reduce the risk of stem loosening.

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“…The contact direction was chosen to be perpendicular to the cage surfaces. For the definition of the interaction between implant and bone, a literature search yielded few data concerning the friction coefficient [8,21]. The reported values were related to friction between hip implants and the surrounding femur.…”

Section: Contact Definitionmentioning

confidence: 99%

Factors influencing stresses in the lumbar spine after the insertion of intervertebral cages: finite element analysis

et al. 2002

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IntroductionIntervertebral cages in the lumbar spine have been a promising advancement in spinal fusion. The final goal of the procedure is to relieve low back pain, one of today's major and most expensive health care problems. A large number of cages exist, which are different in design, material and surgical implanting approach. Several clinical follow-up studies have been published, mostly reporting high fusion rates, even though the criteria for success are inconsistent [1,5,17,18,23,25,30,31]. Additionally, there have been reports of mechanical failure, subsidence and migration [23,39,42]. The success of a cage insertion, which is regarded as fusion, and thereby stabilisation, of the spine, in addition to the biological factors, may be dependent on other parameters, including material properties of the vertebrae or the cage, geometry of the implant, and the interface between the bone and the cage [23,25,39,43].Hence, experimental and finite element studies have been carried out to investigate the influence of these facAbstract Intervertebral cages in the lumbar spine have been an advancement in spinal fusion to relieve low back pain. Even though initial stability is accepted as a requirement for fusion, there are other factors. The load transfer and its effect on the tissues adjacent to the cage may also play an essential role, which is not easily detectable with experimental tests. In this study the effects of an intervertebral cage insertion on a lumbar functional spinal unit were investigated using finite element analyses. The influences of cage material, cancellous bone density and spinal loading for the stresses in a functional spinal unit were evaluated. Three-dimensional (3D) finite element models of L2-L3 were developed for this purpose. An anterior approach for a monobloc, boxshaped cage was modelled. Models with cage were compared to the corresponding intact ones. The results showed that inserting a cage increased the maximum von Mises stress and changed the load transfer in the adjacent structures. Varying the cage material or the loading conditions had a much smaller influence than varying the cancellous bone density. The denser the cancellous bone, the more the stress was concentrated underneath the cage, while the remaining regions were unloaded. This study showed that the density of the underlying cancellous bone is a more important factor for the biomechanical behaviour of a motion segment stabilized with a cage, and its eventual clinical success, than the cage material or the applied load. Inserting an intervertebral cage markedly changed the load transfer. The altered stress distribution may trigger bone remodelling and explain damage of the underlying vertebrae.

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Analysis of cementless implants using interface nonlinear friction—Experimental and finite element studies

Cited by 42 publications

References 19 publications

Friction properties at the bone-metal interface: Comparison of four different porous metal surfaces

Friction properties at the bone-metal interface: Comparison of four different porous metal surfaces

Initial stability of a new hybrid fixation hip stem: Experimental measurement of implant-bone micromotion under torsional load in comparison with cemented and cementless stems

Factors influencing stresses in the lumbar spine after the insertion of intervertebral cages: finite element analysis

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