Investigation of Mechanical Behaviour of the Bone Cement (PMMA) under Combined Shear and Compression Loading

Khellafi, Habib; Bouziane, Mohamed Mokhtar; Djebli, Abdelkader; Mankour, A.; Bendouba, M.; Bouiadjra, B. Bachir; Chikh, El Bahri Ould

doi:10.4028/www.scientific.net/jbbbe.41.37

Cited by 12 publications

(12 citation statements)

References 31 publications

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“…For instance, bone cements based on PMMA have a strain to failure of ≈1%. 57,58 Additionally, the materials containing Mg and Zn have an elastic modulus in the range of 100-300 MPa after 8 weeks, which is in the range of mandibular trabecular bone ≈200 MPa and therefore could be considered as viable options for bone repair in that anatomical location. 59 Regardless of the presence of Mg and Zn particles, the materials did not present changes in their excellent biocompatibility.…”

Section: Discussionmentioning

confidence: 99%

Medical grade 3D printable bioabsorbable PLDL/Mg and PLDL/Zn composites for biomedical applications

Thompson,

Domínguez,

Bardisa

et al. 2023

J Biomedical Materials Res

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Medical grade PLDL, PLDL/Mg and PLDL/Zn filaments were manufactured by a dual extrusion method and used to prepare coupons and scaffolds with controlled porosity by fused filament fabrication. The mechanical properties, degradation mechanisms and biological performance were carefully analyzed. It was found that the presence of 4 vol.% of Mg and Zn particles did not substantially modify the mechanical properties but accelerated the degradation rate of PLDL. Moreover, the acidification of the pH due to degradation of the PLDL was reduced in the presence of metallic particles. Finally, cell adhesion and proliferation were excellent in the medical grade PLDL as well as in the polymer/metal composites. These results demonstrate the potential of bioabsorbable metal/polymer composites to tailor the mechanical properties, degradation rate and biocompatibility for specific clinical applications.

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Section: Discussionmentioning

confidence: 99%

Medical grade 3D printable bioabsorbable PLDL/Mg and PLDL/Zn composites for biomedical applications

Thompson,

Domínguez,

Bardisa

et al. 2023

J Biomedical Materials Res

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“…The shear stress obtained with − 3°, − 2° and 0° configurations is below 1% of the total stress, which is therefore negligible; the − 5° and 5° configurations, on the other hand, present values of shear stress up to 5% which therefore make these slopes potential causes of complications as shear stress represents one of the main risks leading to bone fractures [32]. This is indeed of paramount importance to take in consideration also in terms of bone-prosthesis interface: in this study only an uncemented model was analysed (and therefore high values of shear stress can lead to implant loosening as a consequence of bone failure), but the increase of this stress component can lead to issues also in case of cemented implants, since also cement presents lower mechanical properties in terms of shear [33].…”

Section: Discussionmentioning

confidence: 99%

Finite element analysis of malposition in bi-unicompartmental knee arthroplasty

Armillotta

Bori²,

Innocenti³

2022

Arch Orthop Trauma Surg

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Purpose Bi-unicompartmental knee arthroplasty is a less invasive treatment than a total one, great advantage for the patient but more difficult for the surgeon because of the lower visibility during surgery; this can therefore lead to eventual small errors in cutting angles during the procedure. The aim of this study is to investigate the effects of these slight angle variations in terms of anterior-posterior slope for the lateral tibial tray. Methods The geometries of the bones were acquired and uncemented fixed bearing metal-back UKAs virtually implanted in a finite elements environment. The lateral component was implanted in six different antero-posterior slope configurations (from − 5° to + 5° respect to medial component). Material properties for implant, bones and soft tissues were taken from the literature. A vertical compressive force of 2000 N was applied in full-extended configuration on the femur. Von Mises stress distribution in proximal tibia, load/pressure/contact area repartitions between the medial and lateral compartments was extracted as outputs. Results Outcomes for 0° and − 3° configurations are acceptable, but the − 2° of slope configuration achieved the best ones in terms of stress on proximal tibia, load repartition, contact pressure distribution and shear component. Drastically different results are found for the ± 5° configurations, presenting a level of unbalancing often associated with weak stability and failure over time. Conclusions Slight errors can happen during the surgery: performing the cut aiming to slightly posterior slopes during the surgery helps to minimize the chances of obtaining positive slopes that could lead to an unstable implant.

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“…The mechanical behaviors of PMMA cement are much stronger in compression than in tension when compared with cortical bones. 19,20 The application of the cement is well suited in the periacetabular weight-bearing region, where exposure to tensile stress is limited.…”

Section: Discussionmentioning

confidence: 99%

Pelvis weight‐bearing ability after minimally invasive stabilizations for periacetabular lesion

Lea

Tutton

Alsaikhan

et al. 2020

Journal Orthopaedic Research

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Periacetabular metastatic lesions cause debilitating weight-bearing pain and pose a risk of pelvic pathologic fracture. Minimally invasive percutaneous stabilization is an alternative palliative therapy over extensive open reconstructive surgeries. This study aimed to investigate the biomechanical behaviors of three distinct techniques of percutaneous periacetabular stabilization. A total of 20 composite hemipelves custom-made to contain Harrington type III periacetabular lesion based on a patient's computed tomograpy scans were assigned to treatment groups of cementoplasty alone using polymethyl methacrylate (Cement), screw fixation alone using ischial and posterior-to-anterior screws (Screws), cement-augmented screws (Screws&Cement), and a control group (Untreated). All hemipelves were loaded in a mechanical test configuration mimicking a single-legged stance, and failure load, failure deformation, and construct stiffness were determined. In the experiments, Screws&Cement demonstrated the highest yield strength (4711 ± 362 N) and was 12% higher than Cement (4005 ± 304 N, p = 0.019), 125% higher than Screws (2097 ± 359 N, p < 0.0001), and 184% higher than Untreated (1658 ± 254 N, p < 0.0001). No significant difference in yield strength was found between Screws and Untreated. Screws&Cement also demonstrated the highest stiffness (1013 ± 92 N/mm), followed by Cement (893 ± 49 N/mm), and both groups were significantly stiffer than Screws (543 ± 114 N/mm, p < 0.0001) and Untreated (580 ± 91 N/mm, p < 0.0001 for Screws&Cement, and p = 0.0003 for Cement).This study demonstrated that a cement-augmented periacetabular reconstruction is an effective option for percutaneous treatment of Harrington III periacetabular metastatic lesion. The addition of pelvic screws over cementoplasty significantly improved the pelvis load-bearing strength. When large periacetabular lesions are present, augmented screw fixation appears to be the superior choice of treatment.

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Investigation of Mechanical Behaviour of the Bone Cement (PMMA) under Combined Shear and Compression Loading

Cited by 12 publications

References 31 publications

Medical grade 3D printable bioabsorbable PLDL/Mg and PLDL/Zn composites for biomedical applications

Medical grade 3D printable bioabsorbable PLDL/Mg and PLDL/Zn composites for biomedical applications

Finite element analysis of malposition in bi-unicompartmental knee arthroplasty

Pelvis weight‐bearing ability after minimally invasive stabilizations for periacetabular lesion

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