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Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo
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3D-multi-spectral T2 mapping near metal implants.

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|March 19, 2019
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A new multi-spectral quantitative mapping technique allows for noninvasive assessment of soft tissues around joint implants. This method accurately measures tissue characteristics near metal hardware, improving diagnosis for patients with large joint arthroplasties.

Keywords:
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Area of Science:

  • Medical Imaging
  • Biomaterials Science
  • Orthopedic Surgery

Background:

  • Adverse reactions to metallic debris necessitate noninvasive assessment of soft tissues around large joint arthroplasties.
  • Current quantitative mapping techniques struggle to image effectively near metallic implants.
  • There is a critical need for advanced imaging methods to characterize periprosthetic tissues.

Purpose of the Study:

  • To develop and validate a novel multi-spectral quantitative mapping technique for imaging periprosthetic soft tissues.
  • To overcome the limitations of existing techniques in assessing tissues adjacent to metal hardware.
  • To enable early diagnosis of tissue pathology in patients with joint arthroplasties.

Main Methods:

  • A modified 3D multi-spectral imaging (3D-MSI) pulse sequence was developed to acquire images at two echo times.
  • Quantitative capabilities were assessed using phantoms and in vivo knee experiments, compared against a commercial mapping sequence.
  • The technique was applied in two total hip arthroplasty (THA) cases to evaluate periprosthetic joint space quantitative mapping.

Main Results:

  • The proposed multi-spectral mapping technique demonstrated agreement with the clinical standard of care quantitative mapping sequence within experimental error.
  • This agreement was consistent in both quantitative phantoms and in vivo experiments.
  • The technique successfully assessed quantitative mapping variations within the synovial envelope adjacent to implant interfaces in THA cases.

Conclusions:

  • The developed 3D-MSI quantitative mapping sequence is effective for assessing tissue quantitative mapping variations near metal implants.
  • This novel technique addresses the unmet need for noninvasive assessment of periprosthetic soft tissues.
  • The findings support the potential clinical utility of this method in managing patients with joint arthroplasties.