Arm transplantation: prospects and visions.

Area of Science:

• Surgical innovation in limb transplantation
• Regenerative medicine and immunology

Background:

• Above-elbow (AE) replantation outcomes provide a basis for evaluating AE arm transplantation.
• AE arm transplantation may be technically less complex than distal limb transplantations, avoiding microsurgery for macroanastomoses.

Observation:

• Successful AE arm transplantation could yield superior functional results based on the Chen criteria.
• Significant nerve regeneration distances are required for intrinsic hand muscle reinnervation, impacting overall hand function.
• Transplanted vascularized bone marrow may induce chimerism and immune tolerance but carries a risk of graft-versus-host disease.

Findings:

• AE arm transplantation presents a potentially simpler surgical approach compared to distal limb procedures.
• Nerve regeneration for intrinsic hand muscles poses a significant challenge to functional recovery.
• Immunological considerations, including chimerism and graft-versus-host disease, are critical factors.

Implications:

• Prospective trials comparing AE arm transplantation to neuronal-controlled prosthetics are essential.
• These trials will establish the gold standard for reconstructive surgery of the upper extremity.
• The study highlights the complex interplay of surgical technique, nerve regeneration, and immunology in limb transplantation.