Triply periodic minimal surface (TPMS) is identified as a suitable model for designing porous structures. Gyroid cellular structure (GCS) the most widely studied type of TPMS structure. The majority previous studies on GCS have focused its isotropic However, potential candidate bone repair, anisotropic structures need to be considered. This study presented strategy control anisotropy by changing geometrical parameters. finite element method was subsequently applied determine elastic response...

Most preoperative planning calculations of impingement-free range motion (IFROM) and safe zone (IFSZ) rarely consider non-standard shaped prostheses bony impingement (BI) for total hip arthroplasty (THA). This research developed a novel algorithm that considers BI, prosthetic impingement, pelvic tilt angle ( PT ) in the sagittal plane, non-standard-shaped prostheses. aimed to investigate effect BI on IFROM, IFSZ, rate. Using this calculate case, we found when considering (1) upper limit...

The fretting corrosion behaviours of Al2O3 ceramic/Ti6Al4V alloy, 316 L stainless/Ti6Al4V and CoCrMo alloy/Ti6Al4V alloy pairs were studied in an in-house developed fretting-corrosion tester. characterized by the Ft-D-N Ft/Fn curves. morphology worn surface was analyzed energy dispersive X-ray spectrometry (EDX), a scanning electron microscope (SEM), white light interferometer (WLI). regimes found to vary from slip regime (SR) mixed (MFR), with increase loads for Al2O3/Ti6Al4V L/Ti6Al4V...

The use of long stems for severe femoral bone defects is suggested by many scholars, but it associated with further loss, intraoperative fracture, increased surgical trauma, and complications. With better retention, simple quick procedures, minimal complications, the short cementless a tapered rectangular shape may be an alternative revision. This study aimed to evaluate results this type stem in treating selected Paprosky II-IV defects.

The use of 3D optical equipment for multi-view scanning is a promising approach to assessing the processing errors engine blades. However, incomplete scanned point cloud data may impact accuracy registration (PCR). This paper proposes four-point orientation method improve efficiency and coarse turbine blades prevent PCR failure. First, divided into four labeling blocks based on principal component analysis. Second, keypoints are detected in each block their distance from plane formed by axes...

There is great difficulty in quickly calculating the impingement-free range of motion (IFROM) hip components with complex shapes after total arthroplasty. We have established a new algorithm to investigate effect different on IFROM and safe zone (IFSZ). Then find best combination prosthesis optimal mounting position elevated-rim liner under radiographic anteversion (RA) inclination (RI) cup. found larger opening angle beveled-rim smaller cross-sectional area stem neck an inverted teardrop...

Abstract Corrosion at the taper/trunnion interface of total hip replacement (THR) often results in severe complications. However, underlying mechanisms biotribocorrosion during long-term walking gait cycles remain to be fully understood. In this study, a joint simulator was therefore instrumented with an electrochemical cell for in-situ monitoring tribocorrosion evolution metal-on-polyethylene (MoP) THR typical gait. addition, mechanism investigated via surface and chemical...

This paper reviews the recent advancements in computational modelling of lubrication hip and knee joint replacements, especially those concerning Professor Duncan Dowson’s contribution. The review starts with development five key parameters that appeared pioneered Hamrock–Dowson formula. Then, theory approaches for mixed which artificial replacements operate are reviewed. We also discuss current challenges behaviour how these could be addressed future studies. These include theory, numerical...

Sliding friction is a complex phenomenon which arises from the mechanical and molecular interactions of asperities when examined in microscale. To reveal further understand effects micro scaled components coefficient on overall frictional behavior, hybrid molecular-mechanical model developed to investigate main factors, including different loads surface roughness values, sliding boundary lubrication condition. Numerical modelling was conducted using deterministic contact based theory...

Revision total knee arthroplasty (TKA) is challenging to perform in patients with periprosthetic joint infection (PJI) due the difficulty of eradicating and potential for bone ligamentous deficits. The current study aimed evaluate midterm survival varus-valgus constrained (VVC) implants used one-stage revision TKA chronic PJI at our institution. This retrospective analysis included 132 who underwent using a VVC implant. average follow-up was 51.6 months (range: 24-85 months). Five-year...

Fretting corrosion as one of the leading causes for failure modular hip prostheses has been associated with micromotion at head-neck taper junction. Decomposition is helpful to promote development more realistic experiments investigating mechanisms junction in total arthroplasty. The aim this study was decompose complex three-dimensional into multiple fundamental modes, including three translational and rotational components. A finite element model composed junction, liner acetabular cup a...

In revision hip arthroplasty, managing the large protrusio acetabular defects remains a challenge. The report described novel technique which employs trabecular metal shell as super-augment to buttress superior medial structure.Between January 2015 and December 2018, multicup reconstruction was performed in 21 patients with severe defects. shell, plus two similar porous components implanted into initial create "multicup" construct. functional outcomes were evaluated terms of Harris Hip...

This study aims to evaluate the reconstructive stability for Paprosky III acetabular defects after total hip arthroplasty using three different reconstruction strategies with trabecular metal (TM) augments. The bone examined were located in ilium, sciatic ramus and pubic ramus. Different scenarios of reconstructions simulated, including non-reconstruction model (NRM), complete (CRM), two-point (TRM) superior edge (SRM). A primary replacement (HRM) was also investigated compare initial...

To investigate the biomechanical effects of direct ventricular assistance and explore optimal loading mode, this study established a left model heart failure patients based on finite element method. It proposed mode that maintains peak pressure compression, compared it with traditional sinusoidal from both hemodynamic perspectives. The results showed modes significantly improved parameters, ejection fraction increased baseline 29.33% to 37.32% 37.77%, respectively, while pressure, stroke...