Eﬀect of posterior tibial slope and implant material on the bone-implant system following TKA: A finite element study

B, Ravishanker Baliga; B, Raghuvir Pai; Shenoy, Bhaskar; Hegde, Atmananda; K, Sharath Rao; Swaroop, S.; Shetkar, Abhijeet

doi:10.1080/23311916.2018.1513771

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…The posterior inclination of the tibial plateau is known as the Posterior tibial slope (PTS). The normal range for PTS has been reported in different studies anywhere between 3°-9° (2) , Hofmann et al reported 7°, Laskin and Reiger have reported 8°-10°, and Chiu et al said 14.8° (3) . However, the extent of PTS may vary depending on ethnicity, age group and patient's needs (2) , Conventionally the PTS cannot be reconstructed correctly in every patient due to inter-patient variability and surgical instruments uncertainty (4) .…”

Section: Introductionmentioning

confidence: 89%

Changes of Tibial Slope After Cruciate Retaining–total Knee Replacement and Their Functional Effect Outcome

Noori,

Abdulla

2022

JSMC

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Background Total knee arthroplasty has been regarded as the primary surgical procedure for relieving severe pain in the last stage of degenerative arthritis and experiencing better functional outcomes. many previous studies have been described the effect of posterior tibial slope on functional outcome, but many debates exist. Objectives To find changes of posterior tibial slope in total knee arthroplasty. Patients and Methods Our study includes 50 patients (50 knees) who underwent Cruciate Retaining-Total knee Replacement (CR-TKR) from 10 January 2018 to Nov2019. Posterior tibial slope (PTS) was measured on lateral x-ray. According to the oxford knee score, the functional outcome and the posterior tibial slope were measured preoperatively and postoperatively for each patient. Results Fifty patients underwent CR-TKR. Preoperative PTS and oxford knee scores were 11.7 and 11.72, respectively. Postoperative PTS and oxford knee scores were 9.3 and 39.64, respectively. We divided into Group A: PTS up to 9(24 cases) and Group B PTS more than 9 (26). We analyzed the relationship between PTS and functional outcome according to the oxford knee score. Conclusion Clinical improvements were noticed in both patient groups after CR-TKR.

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Section: Introductionmentioning

confidence: 89%

Changes of Tibial Slope After Cruciate Retaining–total Knee Replacement and Their Functional Effect Outcome

Noori,

Abdulla

2022

JSMC

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“…Generally, such studies make simplifying assumptions to enable calculation. Some of these hypotheses base both the choice of material properties and the boundary conditions on clinical literature, but without considering the patient's specific features (Table 1) (Castro et al 2015;Brihault et al 2016;El-Zayat et al 2016;Innocenti et al 2016;Thompson et al 2016;Baliga et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…(in MPa) for q 0:778 assign them in differentiated (Baliga et al 2018) or non-differentiated fashion to the trabecular and bone regions (Taddei et al 2006a), while generic models assign homogenous material properties in different subregion of the bones (Au et al 2005;Innocenti et al 2016), It would, therefore, be of great interest to evaluate the differences, in terms of biomechanical fields, resulting from the use of different material properties assignment strategies and integrates into this process, along with geometrical criteria, patient-specific mechanical properties via empirical formulae linking the mechanical properties of the tibia to the CT scan acquisitions (Helgason et al 2008;Knowles et al 2016). Moreover, the acquisition-window height of the CT scans required for a patient-specific finite element model (PSFEM) could be minimized to reduce patients radiation exposure (Brenner and Hall 2007), acquisition time and PSFEM size.…”

Section: Introductionmentioning

confidence: 99%

Influence of material properties and boundary conditions on patient-specific models

Goin

Renault

Thibes

et al. 2020

Computer Methods in Biomechanics and Biomedical Engineering

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Patient-specific finite element models (PSFEM) are becoming more and more used. Different methods for assigning their material properties were studied on PSFEMs of 9 tibias along with the minimal required length of the CT acquisition window. Material properties are generally attributed to the PSFEM using relationships linking the grayscale of CT scans to the elasticity moduli. Using cortical-specific and trabecular-specific relationships or a generic one, did not result in significant differences. However, the use of homogeneous elastic moduli in the cortical and trabecular regions led to considerable differences. The result highlight that the PSFEM must comprise at least 40% of the tibia to ensure consistent results in the proximal 20%.

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Effect of design and surgical parameters variations in mobile‐bearing versus fixed‐bearing unicompartmental knee arthroplasty: A finite element analysis

Luyckx,

Bori,

Saldari

et al. 2024

J. exp. orthop.

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PurposeUnicompartmental knee arthroplasty (UKAs) are available in the market as fixed‐ and mobile‐bearing (FB and MB) and can be characterised by a different set of design parameters in terms of geometries, materials and surgical approaches, with overall good clinical outcomes. However, clear biomechanical evidence concerning the consequences of variations of these features on knee biomechanics is still lacking; therefore, the present study aims to perform a sensitivity analysis to see which outcomes are affected by these variations.MethodsFor both MB‐UKA and FB‐UKA, five design and surgical parameters were defined (bearing insert thickness, tibial component material, implant components friction coefficient, antero‐posterior slope angle and level of tibial bone resection). Two control models were defined based on standard configurations for both implants. Finite element analysis was chosen to perform this study, and different parameter combinations (216 models in total) were implemented and tested at both 0° and 90° of flexion, using a previously validated finite element knee model. The results were then evaluated in terms of bone and polyethylene Von Mises stress and tibio‐femoral contact area.ResultsBearing thickness, tibial bone cut and slope angle were found to be the most sensitive parameters for both types of UKAs. Specifically, changes in these parameters in the FB‐UKA appeared to induce more significant variations in the polyethylene insert (both in terms of polyethylene stress and contact area), while in the MB‐UKA, these changes influenced bone stress distribution more.ConclusionsSurgical parameters returned to have a more significant influence than material and friction variations; furthermore, the outcomes most affected by parameter variations were the insert‐related ones for FB‐UKA while for the MB‐UKA were the ones regarding tibial bone stresses.Level of EvidenceNot Applicable.

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Eﬀect of posterior tibial slope and implant material on the bone-implant system following TKA: A finite element study

Cited by 3 publications

References 37 publications

Changes of Tibial Slope After Cruciate Retaining–total Knee Replacement and Their Functional Effect Outcome

Changes of Tibial Slope After Cruciate Retaining–total Knee Replacement and Their Functional Effect Outcome

Influence of material properties and boundary conditions on patient-specific models

Effect of design and surgical parameters variations in mobile‐bearing versus fixed‐bearing unicompartmental knee arthroplasty: A finite element analysis

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