SPECIALTY TOPICS · GUIDE
Tissue Engineering, Biomaterials and Scaffolds
What tissue engineering, biomaterials and scaffolds are, which engineered products the FDA has approved for specific uses, and where the research is still early.
Content last updated . This page has not been medically reviewed.
Back to Emerging Wellness ScienceWhat the terms mean
A bioengineered tissue typically combines target cells with a biomaterial that gives structural support, and sometimes a "bioink" that helps cells function and mature. [1] A scaffold is the support structure. It can be made of natural materials such as collagen or of synthetic ones, and some products are cell-free.Research that is still investigational
Airway. A 2025 review of tissue-engineered tracheal grafts describes promising scaffold designs and early clinical experience, but persistent problems, including incomplete lining regrowth and mechanical instability, have hindered clinical translation. [6]Whole organs from donor scaffolds. Liver bioengineering involves stripping cells from an organ and repopulating the remaining structure. A 2024 review lists unresolved obstacles: immune reactions to the scaffold, lack of standard methods, choice of cell source, and rebuilding blood vessels and bile ducts. [7] Evidence level: preclinical (cells/animals only) in the sources I read.
Printed constructs. See bioprinting and organ repair and replacement research.
Common limits
- Blood vessels: rebuilding the vascular tree is one of the obstacles named for bioengineered liver. [7]
- Standards: a 2025 review notes a lack of guidelines and well-regulated international standards for bioprinted tissue production. [8]
- Longevity of engineered tissue and meeting biomechanical requirements are named as bottlenecks. [8]
Not the same as consumer products
"Scaffold" and "collagen" in a marketing claim do not mean a regulated engineered tissue. A collagen supplement is not a cartilage scaffold. See collagen for skin, joints and bone. Also see claim check: regenerates any tissue.Related guides
Frequently asked questions
Is tissue engineering only experimental?
No. Some engineered products are FDA-approved for narrow uses, such as MACI for adult knee cartilage defects. [2] Many other uses are investigational.
Does an approved engineered product mean similar clinic treatments are approved?
No. Approvals are for a specific product and indication. [4]
Can we grow replacement organs now?
Not as routine care. Reviews of airway and liver engineering list unresolved obstacles. [6] [7]
What is a scaffold?
A supporting structure for cells or tissue, sometimes with a bioink to help cells function. [1]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Approved examples (United States, FDA product pages read 2026-10-22)
| Product | FDA-stated indication | What it is |
|---|---|---|
| MACI | Repair of symptomatic full-thickness cartilage defects of the knee in adults [2] | A person's own cultured cartilage cells on a porcine collagen membrane [3] |
| StrataGraft | Debrided thermal burns with intact dermal elements in adults [4] | Allogeneic (donor) cultured skin cells in collagen [4] |
| SYMVESS | Vascular conduit for extremity arterial injury when urgent revascularization is needed and an autologous vein graft is not feasible [5] | An acellular tissue-engineered vessel [5] |
Each of these is approved medicine for the stated indication only. That is the difference between an approved product and an approved indication. Approval of MACI for knee cartilage, for example, does not cover other joints or other cartilage products.
Safety note
References
- Three-dimensional bioprinting for organ bioengineering: promise and pitfalls. Curr Opin Organ Transplant 2018. PubMed 30234736. Read 2026-10-22.
- U.S. Food and Drug Administration. MACI product page. Read 2026-10-22.
- U.S. Food and Drug Administration. Approved Cellular and Gene Therapy Products. Read 2026-10-22.
- U.S. Food and Drug Administration. STRATAGRAFT product page. Read 2026-10-22.
- U.S. Food and Drug Administration. SYMVESS product page. Read 2026-10-22.
- Tissue-Engineered Tracheal Reconstruction. Biomimetics 2025. PubMed 40710270. Read 2026-10-22.
- Liver tissue engineering using decellularized scaffolds. Bioact Mater 2024. PubMed 38973992. Read 2026-10-22.
- 3D bioprinting in tissue engineering: current state-of-the-art and challenges. Biofabrication 2025. PubMed 40513614. Read 2026-10-22.