Embedded Files
Key Tech: Fusion Design & Simulation, MATLAB, Inverse Dynamics
Date: Fall 2025
Project Goal and Personal Responsibilites
In this group project we were tasked with investigating a condition requiring a Total Hip Aristoplasty (THA) and designing an implant for suitable use.
This involved an extensive literature review, specific pateint use case, and debate on selecting our approach.
My personal roles included leading implant shape design, calculating dynamic gait forces using motion capture data, and running FEA simulations following various ISO and ASTM guidelines.
Patient Conditon
Osteoarthritis in elderly women was our condition of focus given its current prevalence, treatment shortfall, and future growth projections, indicating a need for innovation
Osteoarthritis Effect [1]
Annual THA Procedures Are to Reach >1 M by 2039 [2]
[1] Katz JN, Arant KR, Loeser RF. Diagnosis and treatment of hip and knee osteoarthritis: a review. JAMA. 2021;325(6):568-578
[2] J. A. Singh, S. Yu, L. Chen, and J. D. Cleveland, “Rates of Total Joint Replacement in the United States: Future Projections to 2020–2040 Using the National Inpatient Sample,” J. Rheumatol., vol. 46, no. 9, pp. 1134–1140, Sept. 2019, doi: 10.3899/jrheum.170990.
Force Calculation Process Flow
Injury Mechanics & Force Analysis
Motion capture data matching our patient case was obtained from Criekinge et al's "A full-body motion capture gait dataset of 138 able-bodied adults..."
Inverse dynamic equations were set up from the ankle to the hip and converted into MATLAB for solving
Resulting data was plotted for one gait cycle, normalized to the patient's bodyweight
Market Analysis and Novel Feature
A review of current market offerings was taken to identify relevant technologies for our patient case
A dual mobility cup was selected to improve range of motion, and thus quality of life
A cemented stem was selected to minimize the risk of revision surgeries and complications
A novel technology of localized heat treatment was chosen to limit stress shielding by making the elastic modulus of the implant closer to that of natural bone
Local Heat Treatment
G. Yamako et al., “Improving stress shielding following total hip arthroplasty..."
Proposed Implant Design
Complete Assembly Drawing
Our Acetabular Assembly Consists of a Titanium Acetabular Shell, Zirconia-niobium Liner, Uhmwpe Outer Femoral Head, and Aluminum-zirconium Inner Femoral Head
Implant Design and Simulation
Following our research, our implant was designed with inspiration from the Stryker Exeter and the Zimmer Biomet Avantage
Three cases were selected in simulating the stem integriety.
Single leg stance represents full bodyweight being applied to just one leg.
ISO 7206-4 / ASTM F2996-20 represent standard industry test conditions for FEA analysis.
Stumble represents the absolute worst-case load scenario in which 11 kN is applied, according to G. Bergmann et al's, “Realistic loads for testing hip implants"
Stem Engineering Drawing
Stem FEA Analysis Results
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