Dassault Systemes > Case Studies > No Two Hips are Alike: Mobelife leverages realistic simulation for patient-specific design and analysis of hip

No Two Hips are Alike: Mobelife leverages realistic simulation for patient-specific design and analysis of hip

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Customer Company Size
SME
Region
  • Europe
Country
  • Belgium
Product
  • Mobelife's Acetabular implant design process
  • Materialise's Mimics medical imaging software
  • Abaqus FEA software
Tech Stack
  • Computed Tomography (CT)
  • 3D modeling
  • Finite Element Analysis (FEA)
Implementation Scale
  • Pilot projects
Impact Metrics
  • Productivity Improvements
  • Customer Satisfaction
Technology Category
  • Analytics & Modeling - Digital Twin / Simulation
  • Functional Applications - Remote Monitoring & Control Systems
Applicable Industries
  • Healthcare & Hospitals
Applicable Functions
  • Product Research & Development
  • Quality Assurance
Use Cases
  • Predictive Maintenance
  • Digital Twin
Services
  • Software Design & Engineering Services
  • System Integration
About The Customer
The customer in this case study is a 50-year-old woman who was diagnosed with a pseudotumor after Resurfacing Arthroplasty for osteoarthritis of the left hip joint. The revision failed after one year and she developed a pelvic discontinuity. Using conventional methods, the extreme bone loss would make it even more difficult to replace the prosthesis. The woman was able to carefully take her first steps completely pain free a few days after surgery. She is recovering extremely well, exceeding usual primary revalidation patterns.
The Challenge
The article discusses the challenges faced in hip replacement surgeries, particularly in cases where the patient has outlived the lifespan of the hip prosthesis, which is typically between 15 to 20 years. When a prosthesis fails, a revision surgery is carried out to replace the components. However, a significant challenge faced during implant revision surgery is that the pelvic bone stock is often significantly reduced. Ten-year failure rates of primary hip replacements are estimated at 11.4%. This number more than doubles to 25.6% in case of revisions. In over 58% of those revision failures, the acetabular component is involved. To deal with these challenges, a custom approach is most suitable.
The Solution
Mobelife, a Belgian high-tech company, has developed a completely customized approach based on Computed Tomography (CT) data by combining state-of-the-art image processing tools from Materialise and Abaqus FEA. The process begins with the creation of a 3D model of the patient’s pelvic bone based on CT images. Based on the CT-data, the bone is reconstructed automatically and the implant is designed in close collaboration with the surgeon for unique fit and functionality. The precise orientation of the newly created hip socket is anatomically analyzed. In cases of significant pelvic bone loss, the implant extends onto the major bones of the pelvis for fixation. A custom porous structure is used to fill the gap and a thin porous layer of titanium interfaces between the implant and the bone. Flexibility and compatibility are provided for either press-fit or cemented-liner integration.
Operational Impact
  • The patient-specific implant design process allows for personalized restoration in terms of anatomy, stability, and mobility in most devastated pelvic bones.
  • The process helps to investigate mechanical integrity of the design and avoid bone resorption (stress shielding).
  • The implant design was virtually tested with Abaqus to see how it would perform for this specific patient.
  • The implant parts and jig were produced with Additive Manufacturing techniques under ISO 13485 certification.
Quantitative Benefit
  • The patient was able to take her first steps completely pain free a few days after surgery.
  • The patient is recovering extremely well, exceeding usual primary revalidation patterns.

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