... in the model influences the computed contact pressure and wear. This work discusses the influence of the pelvic bone, and how it depends on the acetabular component stiffness. It was modeled as two different polyethylene acetabular cups, considering or not a metal-backing for both 28 mm and 32 mm diametric...

... boundary conditions will change based on whether the surface is in contact or not, which will affect the interstitial fluid pressurization. This in turn will increase or decrease the load sustained by the fluid phase, with a direct effect on friction, wear, and lubrication. In laboratory experiments...

...Benjamin J. Fregly; Carlos Marquez-Barrientos; Scott A. Banks; John D. DesJardins Wear remains a significant problem limiting the lifespan of total knee replacements (TKRs). Though increased conformity between TKR components has the potential to decrease wear, the optimal amount and planes...

... the development of functional tissue engineered cartilage and surgical repair techniques. In recent work, a new methodology involving concomitant linear translational and oscillating rotational motion was developed to determine the frictional and wear characteristics of articular cartilage. The impetus...

...George Matsoukas; Il Yong Kim Aseptic loosening from polyethylene debris is the leading cause of failure for metal-on-polyethylene hip implants. The accumulation of wear debris can lead to osteolysis, the degradation of bone surrounding the implant components. In the present study, a parametric...

... application of the approach using dynamic wear simulation of a total knee replacement constrained to planar motion in a Stanmore machine. The sample points needed for surrogate model fitting were generated by an elastic foundation (EF) contact model. For the computational evaluation, we performed nine...

... of the ulnar component due to polyethylene induced osteolysis. Implant malalignment is thought to be an important cause of bearing wear and implant failure. The ulnar flexion axis can be used to accurately align the ulnar component of the elbow implant; however, the optimal method of determining this axis...

...Matthew C. Paul; Liam P. Glennon; Thomas E. Baer; Thomas D. Brown Scratches on the metal bearing surface of metal-on-polyethylene total joint replacements have been found to appreciably accelerate abrasive/adhesive wear of polyethylene, and constitute a source of the considerable variability...

...Liam P. Glennon; Thomas E. Baer; James A. Martin, Ph.D.; William D. Lack; Thomas D. Brown, Ph.D. Third-body effects appear to be responsible for an appreciable portion of the wear rate variability within cohorts of patients with metal-on-polyethylene joint replacements. The parameters dominating...

...F. Amirouche; F. Romero; M. Gonzalez; L. Aram Polyethylene wear after total hip arthroplasty may occur as a result of normal gait and as a result of subluxation and relocation with impact. Relocation of a subluxed hip may impart a moment to the cup creating sliding as well as compression at the cup...

... to particulate wear debris. Many computational studies have considered the potential for the former, although only few have attempted to tackle the latter. Using finite-element analysis an investigation, taking into account contact pressures as well as glenohumeral kinematics, has thus been conducted, to assess...

... on ISO Draft Standard 14243-2 for knee wear simulation. The distal surface of the tibial insert was supported in the inferior-superior direction, representative of bonded contact with a rigid tibial tray. Loading conditions applied to the insert included an AP load and IE torque (Fig. 2 ). Varus-valgus...

...Edward Ebramzadeh, Ph.D.; Fabrizio Billi, Ph.D.; Sophia N. Sangiorgio, M.S.; Sarah Mattes, M.S.; Werner Schmoelz, Ph.D.; Lawrence Dorr Osteolysis due to wear debris is a primary cause of failure of total joint replacements. Although debris produced by the joint articulating surfaces has been...

...Sunita P. Ho; Paul F. Joseph; Michael J. Drews; Thomas Boland; Martine LaBerge Recently, highly crosslinked UHMWPE components have been promoted for their high abrasive wear resistance over conventional UHMWPE (PE) in total joint replacement (TJR) prostheses to minimize osteolysis and consequent...

... and integrity is not well understood. The first hypothesis to be tested in this study was that the depth-dependent inhomogeneity of the cartilage acts to maximize the interstitial fluid load support at the articular surface, to provide efficient frictional and wear properties. The second hypothesis...

... the micro-pockets. In this way, a poro-elasto-hydrodynamic regime of lubrication is developed. Assuming that lower friction would result in lower adhesive wear, and neglecting the fatigue as well as the abrasive wear, the proposed bearing system hypothetically could reduce the amount of wear debris...

... biomedical engineering wear In arthritic joints, prostheses are often used to replace severely degenerated articular surfaces, thereby relieving pain and gaining near-normal function of the joint for a large number of patients. The long-term performance of joint replacement systems depends, in part...