Compartment-informed biomaterials for facial adipose restoration

Facial soft tissue deficits arising from trauma, congenital malformation, tumor resection, or age-associated degeneration present unique reconstructive challenges. Reconstruction must withstand continuous, high-frequency deformation while maintaining millimeter-scale aesthetic fidelity. Autologous fat grafting is a biologically compatible and accessible option; however, outcomes may be limited by donor-site constraints in select patients, technique sensitivity, and variable long-term retention. Injectable fillers provide rapid correction yet fail to recreate adipose cellularity, extracellular matrix microarchitecture, or perfusable vascular networks. Over the past two decades, facial adipose has been redefined anatomically as a system of discrete superficial and deep fat compartments with distinct boundaries, vascular and cellular compositions, and remodeling trajectories. While these differences are embedded in clinical and surgical decision-making for interventions targeting facial soft tissues, adipose tissue engineering remains dominated by generic soft tissue approaches that ignore compartment-specific complexities. This mismatch of compartment-specific clinical targeting without compartment-informed regenerative material design represents an actionable opportunity for translational progress. In this narrative and conceptual review, we treat facial compartments as an engineering map: we summarize facial adipose biology and compartmental microenvironments as design inputs, and describe or propose cell-augmented engineering approaches and bioactive material strategies. We conclude with a compartment-to-construct framework to inform next-generation soft tissue engineering approaches to facial fat restoration.