Finite Element Modeling

We develop finite element models to evaluate stress levels in tissues and joints to design medical devices, implants, or prostheses. We do this by simulating complex multi-tissue biomechanical systems that are driven by patient kinematics and kinetics data. We use mathematical algorithms to solve for local loading in ‘finite elements’ that may realistically represent a patient’s 3D anatomy through the use of 3D imaging (e.g., MRI and CT scans

Finite Element Model of the Knee

We used MRI images to create the subject-specific three-dimensional finite element model of a knee to evaluate stress distribution in the joint. The in vitro pressure measurements and in silico predicted stress in the tibial cartilage were used to validate the finite element model of the knee. This award-winning validated knee model can be used to plan optimal surgical treatments.

In vitro measurement of joint pressure

Finite element model of the knee

Finite element analysis for the evaluation of stress distribution in tissues

Mootanah R, Imhauser CW, Reisse F, Carpanen D, Walker RW, Koff MF, Lenhoff MW, Rozbruch SR, Fragomen AT, Dewan Z, Kirane YM, Cheah K, Dowell JK, Hillstrom HJ. Development and validation of a computational model of the knee joint for the evaluation of surgical treatments for osteoarthritis. Comput Methods Biomech Biomed Engin. 2014;17(13):1502-17.

Finite Element Model of a Knee Unloading Implant

We employed our validated finite element model of the knee to evaluate the performance of a knee unloading implant that is designed to offload the medial osteoarthritic knee. We conducted finite element analyses to investigate stress distributions in the cartilage and meniscus of the knee at different phases of the gait cycle.

Morgan OJ, Hillstrom HJ, Ranawat A, Fragomen AT, Rozbruch SR, Hillstrom R. Effects of a Medial Knee Unloading Implant on Tibiofemoral Joint Mechanics During Walking. J Orthop Res. 2019 Oct;37(10):2149-2156.

Finite Element Model of the Forefoot

We used MRI images to create the subject-specific three-dimensional finite element model of the forefoot to evaluate stress distribution in the big toe joint. The in vitro pressure measurements and in silico predicted stress in the cartilage were used to validate the finite element model of the knee. The validated knee model can be used to predict the relative outcomes of different surgical treatments.

Morgan OJ, Hillstrom HJ, Bitar R, Sturnick D, Koff MF, Ellis SJ, Deland JT, Hillstrom R. Finite Element Modeling of Planus and Rectus Foot Types for the Study of First Metatarsophalangeal and First Metatarsocuneiform Joint Contact Mechanics. J Biomech Eng. 2022 Aug 1;144(8).

Kim PH, Chen X, Hillstrom H, Ellis SJ, Baxter JR, Deland JT. Moberg Osteotomy Shifts Contact Pressure Plantarly in the First Metatarsophalangeal Joint in a Biomechanical Model. Foot Ankle Int. 2016 Jan;37(1):96-101.

Finite Element Model of the Hip Joint

We created the finite element model of a hip joint, using CT scan dataset, to evaluate the performance of different surgical implant fixation techniques on stress distribution and predict biomechanical stability of the reconstructed hip joint for different bone qualities.

Lamvohee JM, Mootanah R, Ingle P, Cheah K, Dowell JK. Stresses in cement mantles of hip replacements: effect of femoral implant sizes, body mass index and bone quality. Comput Methods Biomech Biomed Engin. 2009 Oct;12(5):501-10.

Mootanah R, Jarrett P, Ingle P, Cheah K, Dowell JK, Shelton JC. Configuration of anchorage holes affects cemented fixation of the acetabular component in total hip replacement: an in vitro study. Technol Health Care. 2008;16(1):19-30.

Mootanah R, Dowell JK, Cheah K, Ingle P, Shelton JC. Configuration of anchorage holes affects fixation of the acetabular component in cemented total hip replacement–a finite element study. Comput Methods Biomech Biomed Engin. 2007 Dec;10(6):439-45.

Kroon M, Visser CP, Mootanah R, Brand R. Performance of 3 gelatine-based resorbable cement plugs: a study on 15 synthetic femurs and a prospective randomized study on 103 patients. Acta Orthop. 2006 Dec;77(6):893-8.

Mootanah R, Ingle P, Cheah K, Dowell JK, Shelton JC. Total hip replacement. Results of a postal survey of current practice on the cement fixation of the acetabular cup in the uk. Hip Int. 2004 Jul-Sep;14(3):155-162.

Mootanah R, Ingle P, Dowell J, Cheah K, Shelton JC. Fixation of the acetabular cup in cemented total hip replacement: improving the anchorage hole profile using finite element method. Technol Health Care. 2000;8(6):343-55.

Finite Element Model of the Dental Implant

We created the finite element model of the mandible and dental implants for different surgical techniques and bone quality, to evaluate the performance of different surgical implant fixation techniques on stress distribution and predict the biomechanical stability of the dental implant.

Boukhlif A, Merdji A, Roy S, Alkhaldi H, Abu-Alshaikh I, Della N, Cristache CM, Hillstrom R. Effect of supporting implants inclination on stability of fixed partial denture: A finite element study. Proc Inst Mech Eng H. 2020 Oct;234(10):1162-1171.

Merdji A, Taharou B, Hillstrom R, Benaissa A, Roy S, Chong PL, Mukdadi O, Della N, Bouiadjra BB. Finite-Element Study of Biomechanical Explanations for Bone Loss around Dental Implants. J Long Term Eff Med Implants. 2020;30(1):21-30.

Merdji A, Mootanah R, Bachir Bouiadjra BA, Benaissa A, Aminallah L, Ould Chikh el B, Mukdadi S. Stress analysis in single molar tooth. Mater Sci Eng C Mater Biol Appl. 2013 Mar 1;33(2):691-8.

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