Bone strength and material properties of the glenoid

Frich, Lars Henrik; Jensen, Niels Christian; Odgaard, Anders; Pedersen, Christina Gundgaard; Søjbjerg, Jens Ole; Dalstra, Michel

doi:10.1016/s1058-2746(97)90029-x

Cited by 78 publications

(62 citation statements)

References 24 publications

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“…For cortical bone, the same method gave an elastic modulus between 4000 and 8000 MPa. These values are in agreement with experimental measurements (Frich et al, 1997;Mansat et al, 1998;Anglin et al, 1999), and are also consistent with other models (Orr et al, 1988;Stone et al, 1999;Lacroix et al, 2000;Murphy et al, 2001). Using similar mechanical properties for bone, cement and polyethylene, the principal stress within cement were in the same range than other 3D FE models (Lacroix et al, 2000;Murphy et al, 2001;Gupta et al, 2004).…”

Section: Discussionsupporting

confidence: 89%

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: Discussionsupporting

confidence: 89%

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

Terrier

Büchler

Farron

2005

Clinical Biomechanics

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“…This study was limited by the isotropic characteristics of the sawbone scapulae: Normal, vital bone is anisotropic 15,16 and its density varies along its length. The results were obtained for static loading situations only.…”

Section: Discussionmentioning

confidence: 99%

“…These materials were used to represent extreme lower and upper elastic moduli for cancellous bone. 15,16 Each scapula was cast into a metal bracket using soft metal alloy, with the glenoid rim facing upwards, (Fig. 3).…”

Section: Methodsmentioning

confidence: 99%

An experimental glenoid rim strain analysis for an improved reverse anatomy shoulder implant fixation

Mordecai

Lambert

Meswania

et al. 2011

Journal Orthopaedic Research

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Loosening of glenoid components in TSA is a main cause of failure. In reverse anatomy TSA designs used for unstable joints, fixation is particularly demanding. Strains developed around the glenoid rim of biomechanical sawbone scapulae implanted with (a) the original fixed-fulcrum Bayley-Walker glenoid prosthesis in current clinical use, and (b) a revised version with conical crosssection, were compared. The conical shape of the revised design was hypothesized to produce greater strains in the glenoid rim than the original tapered screw design. The 2D strain field at three accessible locations around the rim of each scapula was measured with three-element rosette strain gauges for two types of simulated cancellous bone fill under applied physiologically relevant loads. The average strain energy densities around the rim for the conical design were greater than for the original design by a factor of 1.55-2.25 for all loading conditions. Results indicate that a significantly greater proportion of load was directed toward cortical bone in the conical design, thus promoting cortical bone loading.

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“…The selection of the ROIs on the digitized images and the size of each ROI were determined by the intrinsic geometry of the glenoid [27][28][29][30]. The distributions and sizes of the ROIs considered in the current study covered the entire region of the glenoid for analysis of the morphological and mechanical characteristics of the entire glenoid, as established previously [27][28][29][30]. Vertically, the glenoid was divided into three regions: the upper, bare (the area of maximum concavity of the glenoid joint surface), and lower regions.…”

Section: Preparation Of Cadaver Specimensmentioning

confidence: 99%

Mapping of the morphological and the material characteristics on the glenoid and estimation of predominant loading condition on the glenoid through the mapping

Lim

Kim

et al. 2009

J Mech Sci Technol

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The aim of this study was to predict and map the regional distribution of the trabecular architecture and the material properties of the glenoid and to estimate the predominant loading condition on the glenoid through the mapping. The morphological and material characteristics of the glenoid were investigated by analyzing digitized trabecular bone images obtained from twelve cadaver scapula specimens. The morphological and material characteristics computed from the cadaver specimens show that the predominant loading on the glenoid generally occurs during shoulder movement, which produces forces directed toward the posterior aspect of the bare region. This study is innovative in its detailed mapping of the morphological and material characteristics of the glenoid and its pioneering approach used to estimate the loading pattern acting on the glenoid through the mapping.

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Bone strength and material properties of the glenoid

Cited by 78 publications

References 24 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

An experimental glenoid rim strain analysis for an improved reverse anatomy shoulder implant fixation

Mapping of the morphological and the material characteristics on the glenoid and estimation of predominant loading condition on the glenoid through the mapping

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