Transient viscoelastic lubrication analyses of UHMWPE hip replacements

Abstract

The viscoelasticity of the UHMWPE liner may play an important role in the lubrication performance of soft artificial hip joints. All the previous lubrication analyses for UHMWPE hip implants assumed that the UHMWPE liner was linear elastic. In order to investigate the influence of viscoelasticity of the UHMWPE liner, a transient viscoelastic lubrication model was developed. The results showed that the viscoelasticity played a significant role in the lubrication performance of UHMWPE hip implants. Moreover, the retardation time and the ratio of loss and storage modulus of the UHMWPE liner had important effects on the lubrication performance of hip implants. These findings provide new insights into the lubrication mechanisms of UHMWPE artificial hip joints.

Lubrication Effect of Polyvinyl Alcohol/Polyethylene Glycol Gel for Artificial Joints

“…Different PEG weights were added to different amounts of distilled water to obtain PEG solutions with varying concentrations (10,15,20, and 25 wt %). PVA (10 g) was added to 90 mL of distilled water, heated at 90°C, and stirred at 500 rpm for 20 min to obtain a 10 wt% PVA solution; subsequently, the temperature was maintained at 70°C.…”

“…However, frictional and general wear reduce the service life of artificial joints [7][8][9]. Several different solutions have been proposed to mitigate this problem [10,11]. Polyether ether ketone (PEEK) is a biomaterial that is used to create artificial joints for joint replacement [12,13] and is widely used by researchers in other research in the field of prosthetic implants [14][15][16][17].…”

Fabrication and Evaluation of Mechanical and Tribological Properties of ultra-high-molecular-weight polyethylene-based Nanocomposites Reinforced with Hydroxyapatite, Zirconia and Multi-walled Carbon Nanotubes

“…Therefore, compressive elastic modulus can be calculated by substituting the value of , which is reported ν at the level of 0.4 for pure UHMWPE [23].…”

Heat Induction by Viscous Dissipation Subjected to Symmetric and Asymmetric Boundary Conditions on a Small Oscillating Flow in a Microchannel

“…The geometry and properties for the synovial fluid in artificial hip joint are taken as in the following: The joint gap is 50 µm [19], the dynamic viscosity is 10 mPa•s [19], the average sliding velocity is 0.06 m/s [20], the average angular frequency is 1 rad/s [21], the thermal conductivity is 0.62 W/m•K [22], the specific heat is 3900 J/kg•K [22], the fluid density is 1650 kg/m 3 [23], the body temperature is 37 • C [24], and the net mean fluid temperature is 5.5 • C [24], respectively. Utilising these gathered available information, the calculated values for Brinkman number and Prandtl number are 1.0557 × 10 −5 and 62.9, respectively.…”