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Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
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Updated: Sep 16, 2025

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A biosynthetic thumb prosthesis.

Sachi Bansal1, Gracia V Lai1, Marcus Belingheri2

  • 1Department of Bioengineering, University of California Los Angeles, Los Angeles, CA USA.

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|July 7, 2025
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Summary
This summary is machine-generated.

This study presents a novel biosynthetic prosthesis that integrates titanium with patient-derived, neurotized skin to restore sensation and function in extremities. This innovative approach offers a promising alternative for limb reconstruction after severe damage.

Keywords:
Preclinical researchTranslational researchTrauma

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Surgery

Background:

  • Severe extremity damage often necessitates amputation when biological reconstruction is not feasible.
  • Current synthetic prostheses lack the crucial ability to restore skin sensation.
  • Restoring both structure and sensory feedback is vital for functional limb replacement.

Purpose of the Study:

  • To develop and validate a biosynthetic prosthesis combining synthetic materials with biological tissues.
  • To restore sensory feedback and functional capabilities, such as opposition pinch, in amputated digits.
  • To provide a framework for advanced limb reconstruction.

Main Methods:

  • A biosynthetic prosthesis was designed using titanium for structural support.
  • The prosthesis was enclosed in neurotized skin derived from the patient's own body.
  • Mechanical function was validated through benchtop and cadaver testing; skin interface viability was assessed in an animal model.

Main Results:

  • The biosynthetic prosthesis successfully recreated opposition pinch by linking prosthetic and residual biological joint motion.
  • The neurotized skin interface demonstrated viability in an animal model.
  • Mechanical validation confirmed the prosthesis's functional capabilities.

Conclusions:

  • A biosynthetic prosthesis integrating titanium and patient-derived neurotized skin offers a viable solution for extremity reconstruction.
  • This approach successfully restores both mechanical function and sensory feedback.
  • The study provides a foundational framework for the future of prosthetic limb development and functional reconstruction.