Joint injuries represent a critical threat to military readiness and long-term service member health. Post-traumatic osteoarthritis (PTOA) affects service members at a 12-fold higher rate than civilians, with joint injuries accounting for over 25% of all military medical evacuations from theater. Current treatment paradigms rely on joint replacement with metal and plastic implants that are fundamentally incompatible with military service requirements, preventing return to full duty and participation in high-impact activities essential for combat readiness. The economic burden exceeds $25 billion annually when accounting for direct medical costs, lost productivity, and disability compensation. Service members with PTOA face years of progressive disability, revision surgeries, and often permanent functional limitations. Hand and finger trauma from IED blasts affect 68% of service members' ability to return to full duty, while foot and ankle injuries severely limit mobility and load-bearing capacity crucial for deployment readiness. Current technology has demonstrated complete regeneration of 5cm segmental bone defects and full-thickness cartilage restoration in large animal models. However, effective reconstruction of dense connective tissues like tendon and ligament critical for the restoration of function has not been demonstrated. Unlike mechanical implants, regenerated tissue grows with the patient, selfrepairs minor damage, and maintains the complex biomechanical properties optimized by evolution. This enables service members to return to unrestricted duty after experiencing a traumatic joint injury. This SBIR seeks a revolutionary approach: achieving complete biological finger regeneration by converging technologies that restore native tissue architecture and function, moving beyond current methods of mechanical stabilization and repair. Proposals should detail methods to produce scaffolds that provide an anatomically precise framework for regeneration and to deliver the bioactive proteins and therapeutic factors required to promote the growth of bone, cartilage, ligaments, tendons, and the blood vessels necessary to sustain the new tissue. The platform will be able to address finger and hand injuries critical to military function, restoring fine motor control and full range of motion to hands. Focusing on the finger joints will provide a proof-of-concept for regenerating multiple integrated tissues through tissueengineered approaches. This smaller-scale model is advantageous because it has lower load-bearing requirements than large joint reconstructions (such as the knee, shoulder, or hip), making it an ideal initial objective. Success metrics include complete regeneration of the finger digit verified by imaging, restoration of full range of motion and fine motor capacity appropriate. The technology will be immediately translatable to civilian populations, addressing the 1 million Americans annually who suffer major extremity injuries and establishing a new standard of care that makes prosthetics and metal implants obsolete.
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