Validation of multiple subject-specific finite element models of unicompartmental knee replacement

Tuncer, Mahmut; Cobb, Justin P.; Hansen, Ulrich; Amis, Andrew A.

doi:10.1016/j.medengphy.2013.03.020

Cited by 23 publications

(34 citation statements)

References 45 publications

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“…However, the model generation protocol was the same as in experimentally validated FE models of knee and shoulder replacements developed in our group [16], [47]. The agreement between our findings and those derived from previous studies (experimentally and computationally based), and the evidence from clinical studies supporting the findings, can demonstrate the value of the current work.…”

Section: Discussionsupporting

confidence: 82%

“…Meshes with characteristic edge length of 1.5 mm, which were the finest meshes we were able to utilise given the complexity of the model, the number of model variants and the computational resources we had available, were thus consistently implemented. It should be noted that meshes of equivalent element type and similar density were used and experimentally validated in previous studies conducted in our group to assess micromotion of a glenoid implant inserted into a porcine scapula [16], and strains occurring at the vicinity of atibial component used in knee replacement inserted into a cadaveric human tibia [47].…”

Section: Methodsmentioning

confidence: 99%

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Total ankle replacement design and positioning affect implant-bone micromotion and bone strains

Sopher

Amis

Calder

et al. 2017

Medical Engineering & Physics

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Section: Discussionsupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Total ankle replacement design and positioning affect implant-bone micromotion and bone strains

Sopher

Amis

Calder

et al. 2017

Medical Engineering & Physics

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“…Bone was modeled as a linear and isotropic material. The elastic modulus of each bone element was determined from the Houndsfield Units (HU) of the CT image using a previously established procedure . Specifically, the bone apparent density ( ρ app in g/cm 3 ) was calculated using a linear relationship ρ app = 0.00089 HU + 0.035 and the Young's Modulus from E = 6.850 ρ app .…”

Section: Methodsmentioning

confidence: 99%

Femoral fracture type can be predicted from femoral structure: A finite element study validated by digital volume correlation experiments

Ridzwan

Sukjamsri

Pal

et al. 2017

Journal Orthopaedic Research

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Proximal femoral fractures can be categorized into two main types: Neck and intertrochanteric fractures accounting for 53% and 43% of all proximal femoral fractures, respectively. The possibility to predict the type of fracture a specific patient is predisposed to would allow drug and exercise therapies, hip protector design, and prophylactic surgery to be better targeted for this patient rendering fracture preventing strategies more effective. This study hypothesized that the type of fracture is closely related to the patient-specific femoral structure and predictable by finite element (FE) methods. Fourteen femora were DXA scanned, CT scanned, and mechanically tested to fracture. FE-predicted fracture patterns were compared to experimentally observed fracture patterns. Measurements of strain patterns to explain neck and intertrochanteric fracture patterns were performed using a digital volume correlation (DVC) technique and compared to FE-predicted strains and experimentally observed fracture patterns. Although loaded identically, the femora exhibited different fracture types (six neck and eight intertrochanteric fractures). CT-based FE models matched the experimental observations well (86%) demonstrating that the fracture type can be predicted. DVC-measured and FE-predicted strains showed obvious consistency. Neither DXA-based BMD nor any morphologic characteristics such as neck diameter, femoral neck length, or neck shaft angle were associated with fracture type. In conclusion, patient-specific femoral structure correlates with fracture type and FE analyses were able to predict these fracture types. Also, the demonstration of FE and DVC as metrics of the strains in bones may be of substantial clinical value, informing treatment strategies and device selection and design. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:993-1001, 2018.

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“…The biomechanical effect of the joint line on the contact stress can be practically evaluated in ultra‐high molecular weight PE inserts and articular cartilage by using finite element (FE) analysis. Accurate in silico evaluations of knee joint replacements are a valuable tool for clinical assessment . However, most of the previous FE studies have focused on stresses and strains in the tibial bone, which are presumably related to the coronal malalignments of the tibial component .…”

mentioning

confidence: 99%

“…Accurate in silico evaluations of knee joint replacements are a valuable tool for clinical assessment. 12 However, most of the previous FE studies have focused on stresses and strains in the tibial bone, which are presumably related to the coronal malalignments of the tibial component. [13][14][15][16] The baseline FE models in these studies are limited to UKA and tibia modeling under static loading.…”

mentioning

confidence: 99%

Importance of joint line preservation in unicompartmental knee arthroplasty: Finite element analysis

Kwon

Kang

Son

et al. 2016

Journal Orthopaedic Research

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Unicompartmental knee arthroplasty (UKA) is an effective surgical technique for pain relief and functional restoration in patients with localized osteoarthritis of the knee joint. However, the role of the joint line in UKA, especially its biomechanical effect, has not been previously investigated. This study numerically evaluates the effects of the joint line on the contact stresses in polyethylene (PE) inserts, articular cartilage, and lateral meniscus using the finite element (FE) analysis. The FE model for joint line was modeled as the orthogonal projection line from the medial tibial plateau to the anatomical axis. The joint line was varied from -6 to +6 mm in 2 mm intervals, and the seven FE models were analyzed and compared under ISO gait loading conditions. The contact stresses in the PE insert, articular cartilage, and lateral meniscus matched those of the reference joint line (0 mm) in the ±2 and ±4 mm joint line cases but significantly differed from the reference in the ±6 mm joint line cases. On the +6 mm joint line, the contact stress was greater on the PE insert than on the articular cartilage, whereas the reverse occurred on the -6 mm joint line. This study confirms the post-operative significance of joint line preservation in UKA implantation surgery. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:347-352, 2017.

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Validation of multiple subject-specific finite element models of unicompartmental knee replacement

Cited by 23 publications

References 45 publications

Total ankle replacement design and positioning affect implant-bone micromotion and bone strains

Total ankle replacement design and positioning affect implant-bone micromotion and bone strains

Femoral fracture type can be predicted from femoral structure: A finite element study validated by digital volume correlation experiments

Importance of joint line preservation in unicompartmental knee arthroplasty: Finite element analysis

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