The Effect of Centrifugation on the Fatigue Life of Bone Cement in the Presence of Surface Irregularities

Jp, Davies; O'Connor, D.O.; Burke, D. L.; Jasty, Murali; Wh, Harris

doi:10.1097/00003086-198804000-00020

Cited by 52 publications

(14 citation statements)

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“…According to their theory, a stress higher than 4 MPa would result in a probability of failure lower than 75%. In the same way, Davies et al (1988) reported a Weibull fatigue life of about 245,000 cycles at 7 MPa and 1600 at 15 MPa, for uncentrifugated cement and trabecular bone. According to these experimental studies, 5-7 MPa is a generally accepted value for microcracks initiation within cement (Lacroix et al, 2000).…”

Section: Discussionmentioning

confidence: 68%

Bone–cement interface of the glenoid component: Stress analysis for varying cement thickness

Terrier

Büchler

Farron

2005

Clinical Biomechanics

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Background. Although shoulder arthroplasty is an accepted treatment for osteoarthritis, loosening of the glenoid component, which mainly occurs at the bone-cement interface, remains a major concern. Presently, the mechanical effect of the cement mantel thickness on the bone-cement interface is still unclear.Methods. Finite element analysis of a prosthetic scapula was used to evaluate the effect of cement thickness on stresses and micromotions at the bone-cement interface. The glenoid component was all-polyethylene, keeled and flat back. Cement mantel thickness was gradually increased from 0.5 to 2.0 mm. Two glenohumeral contact forces were applied: concentric and eccentric. Two extreme cases were considered for the bone-cement interface: bonded and debonded.Findings. Within cement, stress increased as cement thickness decreased, reaching the fatigue limit below 1.0 mm. Bone stress was below its ultimate strength and was minimum between 1.0 and 1.5 mm. Interface stress was close to the interface strength, and also minimum between 1.0 and 1.5 mm. Both the decentring of the load and the debonding of the interface increased the stress.Interpretation. A cement thinning weakens the cement, but also the bone-cement interface, along the back-keel edges. Conversely, a cement thickening rigidifies the cemented implant, consequently increasing interfacial stresses and micromotions. To avoid both excessive cement fatigue and interface failure, an ideal cement thickness has been identified between 1.0 and 1.5 mm.

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Section: Discussionmentioning

confidence: 68%

Bone–cement interface of the glenoid component: Stress analysis for varying cement thickness

Terrier

Büchler

Farron

2005

Clinical Biomechanics

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“…Decreasing the porosity of commercial bone cements by means of centrifugation or vacuum mixing has been shown to increase the fatigue life of these materials. [3][4][5] We did not observe an increase in the fatigue life of the experimental compositions tested versus the vacuum-mixed Simplex P controls.…”

Section: Discussionmentioning

confidence: 51%

“…Reduction of porosity in commercial bone cements, by means of vacuum mixing and centrifugation, has been shown to increase the fatigue life of the material. [3][4][5] By reducing the number of pores, there are fewer flaws present in the material, and the crack initiation phase of the fatigue behavior requires more time. Porosity reduction also increases the effective cross sectional area of the bone cement, which decreases the actual stress.…”

Section: Introductionmentioning

confidence: 99%

Effect of initiation chemistry on the fracture toughness, fatigue strength, and residual monomer content of a novel high‐viscosity, two‐solution acrylic bone cement

Hasenwinkel

Lautenschlager

Wixson

et al. 2001

J. Biomed. Mater. Res.

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Porous-free, two-solution bone cements have been developed in our laboratory as an alternative to commercial powder/liquid formulations. Each pair of solutions consist of poly(methyl methacrylate) (PMMA) powder dissolved in methyl methacrylate (MMA) monomer, with benzoyl peroxide (BPO) added to one solution as the initiator and N,N-dimethyl-p-toluidine (DMPT) added to the other as the activator. When mixed, the solutions polymerize via a free radical reaction, which is governed by the concentrations of initiator and activator and their molar stoichiometry. Previous work by the authors has demonstrated that these two-solution cement compositions are comparable to Simplex P bone cement in polymerization exotherm, setting time, and flexural mechanical properties. This study was designed to evaluate the effect of BPO and DMPT concentrations, along with their molar ratio, on the fracture toughness, fatigue strength, and residual monomer content of the experimental compositions. The results showed that fracture toughness and fatigue strength for the solution cements were comparable to Simplex P and were not significantly affected by the BPO concentration or the BPO:DMPT molar ratio; however, the highest DMPT concentration yielded significantly lower values for both variables. Residual monomer content was significantly affected by both the individual concentrations of BPO and DMPT and their molar ratios. The two-solution cements had significantly higher residual monomer contents versus Simplex P; however, this can be attributed to their higher initial monomer concentration rather than a lower degree of conversion.

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“…Various modern cementing techniques have improved 17 followed by sponge drying, ret-rograde injection of cement, and the use of cements that idine (Wako) in the proportion of 1.1% per unit weight of the monomers in the type-T paste, and phenothiazine have been centrifuged 18,19 or vacuum mixed. 20,21 Furthermore, pressurization of the bone-cement has been widely (Wako) as an inhibitor of the polymerization reactions at a proportion of 300 ppm of the monomers in the type-T adopted because it is the most important factor that prevents mechanical loosening of components in clinical practice.…”

Section: Introductionmentioning

confidence: 99%

Pressurization of bioactive bone cementin vitro

Fujita

Iida

Kawanabe

et al. 1999

J. Biomed. Mater. Res.

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We have developed a bioactive bone cement consisting of MgO-CaO-SiO2-P2O5-CaF2 glass-ceramic powder (AW glass-ceramic powder), silica glass powder as an inorganic filler, and bisphenol-a-glycidyl methacrylate (bis-GMA) based resin as an organic matrix. The efficacy of this bioactive bone cement was investigated by evaluating its pressurization in a 5-mm hole and small pores using a simulated acetabular cavity. Two types of acetabular components were used (flanged and unflanged sockets) and a commercially available polymethylmethacrylate (PMMA) bone cement (CMW 1 Radiopaque Bone Cement) was selected as a comparative control. Bioactive bone cement exerted greater intrusion volume in 5-mm holes than PMMA bone cement in both the flanged and unflanged sockets 10 minutes after pressurization (p< 0.05). In the small pores the bioactive and PMMA bone cements exerted almost identical intrusion volumes in flanged and unflanged sockets 10 min after pressurization. The intrusion volume in the flanged socket 10 minutes after pressurization was greater than that in the unflanged socket in all groups (p < 0.05). These results show that bioactive bone cement intrudes deeper into anchor holes than PMMA bone cement.

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The Effect of Centrifugation on the Fatigue Life of Bone Cement in the Presence of Surface Irregularities

Cited by 52 publications

References 0 publications

Bone–cement interface of the glenoid component: Stress analysis for varying cement thickness

Bone–cement interface of the glenoid component: Stress analysis for varying cement thickness

Effect of initiation chemistry on the fracture toughness, fatigue strength, and residual monomer content of a novel high‐viscosity, two‐solution acrylic bone cement

Pressurization of bioactive bone cementin vitro

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