Stress Analyses of Glenoid Component Designs

Te, Orr; Dr, Carter; Dj, Schurman

doi:10.1097/00003086-198807000-00029

Cited by 74 publications

(45 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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: 90%

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

Terrier

Büchler

Farron

2005

Clinical Biomechanics

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionsupporting

confidence: 90%

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

Terrier

Büchler

Farron

2005

Clinical Biomechanics

View full text Add to dashboard Cite

show abstract

“…Contact pressure on the glenoid fossa during internal and external rotations for normal (top) and OA (bottom) shoulders. laws of mechanics [4][5][6][7] or with (ii) deformable body systems [8][9][10][11][12][13][14]. Rigid body models provide useful but coarse approximation of the joint interface behavior.…”

Section: Discussionmentioning

confidence: 99%

“…The first models were based on the inverse dynamic theories [4][5][6][7] and were used to determine the muscular forces. Models based on the deformable body concept [8][9][10][11][12] were then proposed and used to calculate stress distribution within individual bones of the joint. The most recent models combine both approaches by using the muscular forces obtained with the inverse dynamic theory to calculate the stress with a finite element (FE) model [13,14].…”

Section: Introductionmentioning

confidence: 99%

A finite element model of the shoulder: application to the comparison of normal and osteoarthritic joints

Büchler

Ramaniraka

Rakotomanana

et al. 2002

Clinical Biomechanics

137

101

View full text Add to dashboard Cite

Objective. The objective of the present study was to develop a numerical model of the shoulder able to quantify the influence of the shape of the humeral head on the stress distribution in the scapula. The subsequent objective was to apply the model to the comparison of the biomechanics of a normal shoulder (free of pathologies) and an osteoarthritic shoulder presenting primary degenerative disease that changes its bone shape.Design. Since the stability of the glenohumeral joint is mainly provided by soft tissues, the model includes the major rotator cuff muscles in addition to the bones.Background. No existing numerical model of the shoulder is able to determine the modification of the stress distribution in the scapula due to a change of the shape of the humeral head or to a modification of the glenoid contact shape and orientation.Methods. The finite element method was used. The model includes the three-dimensional computed tomography-reconstructed bone geometry and three-dimensional rotator cuff muscles. Large sliding contacts between the reconstructed muscles and the bone surfaces, which provide the joint stability, were considered. A non-homogenous constitutive law was used for the bone as well as non-linear hyperelastic laws for the muscles and for the cartilage. Muscles were considered as passive structures. Internal and external rotations of the shoulders were achieved by a displacement of the muscle active during the specific rotation (subscapularis for internal and infrapinatus for external rotation).Results. The numerical model proposed is able to describe the biomechanics of the shoulder during rotations. The comparison of normal vs. osteoarthritic joints showed a posterior subluxation of the humeral head during external rotation for the osteoarthritic shoulder but no subluxation for the normal shoulder. This leads to important von Mises stress in the posterior part of the glenoid region of the pathologic shoulder while the stress distribution in the normal shoulder is fairly homogeneous.Conclusion. This study shows that the posterior subluxation observed in clinical situations for osteoarthritic shoulders may also be cause by the altered geometry of the pathological shoulder and not only by a rigidification of the subscapularis muscle as often postulated. This result is only possible with a model including the soft tissues provided stability of the shoulder. RelevanceOne possible cause of the glenoid loosening is the eccentric loading of the glenoid component due to the translation of the humeral head. The proposed model would be a useful tool for designing new shapes for a humeral head prosthesis that optimizes the glenoid loading, the bone stress around the implant, and the bone/implant micromotions in a way that limits the risks of loosening.

show abstract

“…Moreover, it should be noted that, providing a correct description of the different material properties, the finite element technique is commonly accepted for calculating the motion and stress state of deformable structures without further experimental assessments. 23,25,32 The cement layer surrounding the glenoid was uniform, and the contact law did not include a stress failure criterion in tension, accounting for adhesion of the cement to the bone. Only rotations were simulated in this work, inducing lower contact forces and stresses than abduction.…”

Section: Discussionmentioning

confidence: 99%

Translation of biomechanical concepts in bone tissue engineering: from animal study to revision knee arthroplasty

Roshan-Ghias

Terrier

Jolles

et al. 2012

Computer Methods in Biomechanics and Biomedical Engineering

View full text Add to dashboard Cite

show abstract

Stress Analyses of Glenoid Component Designs

Cited by 74 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

A finite element model of the shoulder: application to the comparison of normal and osteoarthritic joints

Translation of biomechanical concepts in bone tissue engineering: from animal study to revision knee arthroplasty

Contact Info

Product

Resources

About