Scientists find wool keratin scaffolds produce
more organized bone than collagen, revealing that|
true healing depends on intricate architecture, not just volume
Bones of Contention
Wool Keratin Shows Bone Healing Relies on
Structural Complexity Beyond Evolutionary Accounts
by Dr. Sarah Buckland-Reynolds
If you have ever experienced a broken bone, you know that it is one of the most painful experiences one can have. Compounding the pain during a fracture is the agony involved during the process of healing. Efficient and effective healing for broken bones are vital, as improper healing can result in misalignment, and secondary injuries in surrounding tissue; complications that may compromise comfort and mobility for years to come.
As a useful step to improve the healing process efficiency and outcomes for those with fractured bones, scientists have recently discovered an approach for scaffolding that not only promotes regeneration but also guides the intricate structural organization required for healthy bone repair. The discovery published in an article titled:
Scientists turn wool into sustainable material for bone repair (Sherif Elsharkawy, King’s College London, 23 April 23, 2026). This announcement, republished in ScienceDaily on August 12, 2026, highlighted how keratin, a protein extracted from sheep’s wool, can serve as a scaffold for bone repair. When compared with collagen (the long-standing material used in regenerative medicine) keratin reveals new insights into the intricacies of bone healing. This article explores how this discovery brings to the fore insights on the intricacies of bone formation and healing, and the implications of these on evolutionary assumptions.
The Biological Basis of Bone Healing
While the healing process for fractures is painful, the deconstruction of bone structure can reveal just how remarkable these tissues are in the human body. The bone’s ability to regenerate and remodel itself after injury is unlike many other structures’ capabilities. This regenerative capacity is not a simple act of tissue replacement. Rather, it depends on a finely tuned, complex sequence of biological processes involving cells, signaling molecules, and structural proteins. This process has multiple stages that define this process:
1. Inflammation
Immediately after a bone fracture or defect, blood vessels rupture and a hematoma forms. This clot is not inert but is a dynamic environment where immune cells such as macrophages and neutrophils clear debris and release cytokines. These signaling molecules recruit mesenchymal stem cells and osteoprogenitor cells to the site. The inflammatory stage sets the foundation for subsequent repair, ensuring that the environment is primed for regeneration.
2. Soft Callus Formation
Within days, fibroblasts and chondroblasts infiltrate the hematoma, laying down a temporary matrix of cartilage and fibrous tissue. This soft callus stabilizes the fracture site, bridging the gap between broken bone ends. Although mechanically weak, it provides an internal scaffold for vascular ingrowth and cellular migration. The soft callus is a transitional structure, preparing the site for mineralized tissue.
3. Hard Callus Formation
Osteoblasts, the bone-forming cells, begin depositing woven bone onto the soft callus. This stage transforms the fragile cartilage-like matrix into a mineralized structure capable of bearing weight. The bone formed at this stage is disorganized, with collagen fibres arranged randomly. Nonetheless, it restores mechanical continuity and protects the site from further damage.
4. Remodeling
Over weeks to months, the woven bone is replaced by lamellar bone. Osteoclasts resorb excess tissue, while osteoblasts lay down new bone in organized layers. The remodeling process aligns collagen fibers and mineral crystals along stress lines, restoring the bone’s original architecture and strength. This final stage is crucial: bone is not merely repaired but regenerated to its natural form.
Collagen vs. Keratin: The Role of Scaffolds in Bone Regeneration
In cases of large defects, medical intervention is usually done using external scaffolds to guide regeneration. These biomaterials act as temporary frameworks, preventing soft tissue invasion, supporting cell adhesion, and directing bone growth. An ideal scaffold must be biocompatible, stable, and capable of integrating with surrounding tissue. It must also mimic the natural extracellular matrix, providing cues for cellular organization.
Collagen has long been considered the gold standard in regenerative medicine. As the most abundant protein in connective tissue, collagen naturally interacts with osteoblasts and supports bone deposition. Collagen scaffolds act as protective barriers, allowing bone to grow back while preventing interference from soft tissue. Yet collagen is not without limitations: Its mechanical weakness makes it unsuitable for load-bearing repairs. It degrades quickly, sometimes before bone has fully formed. Extraction is complex and costly, often requiring animal tissue processing. Most importantly, collagen scaffolds tend to produce bone that is abundant (in quantity) but with disorganized structures, in that, the fibres lack alignment, resulting in tissue that is structurally weaker than natural bone.
Bearing in mind these limitations of collagen, the team at King’s College London experimented with another structural protein called Keratin. They used wool as a source for extraction, since it exists in abundance in this substance. When the team processed the keratin into membranes, laboratory tests revealed that human bone cells adhered well to keratin scaffolds, proliferating and expressing markers of healthy bone formation.
Paying attention to the design implications of the King’s College experiment, the research article highlighted that when comparing bone healing using collagen vs. Keratin scaffolds, the growth of bone volume was not the determinant of the best healing outcomes. While collagen scaffolds produced more bone volume; keratin scaffolds generated bone that was more organized and structurally secure. The results highlighted how the alignment of fibres, mimicking the architecture of natural lamellar bones is critical for mechanical strength, as aligned fibres distribute stress efficiently.
Implications on Evolutionary Explanations of Bone Formation
The complexity of bone healing beyond merely restoring bone volume in the fractured area raises an important question on evolutionary explanations of bone formation. While a few variations of the evolutionary explanation of bone emergence exists (and related tissues of enamel, dentine, and cartilage), the mainstream evolutionary view is that vertebrates arose after the appearance of shelled organisms during a time of active tectonism that made Calcium Carbonate more readily available in the environment, which conferred a protective advantage for organisms to develop. Building upon peer reviewed evolutionary literature from the previous thirty years, the following explanation was included in a peer-reviewed article titled: Where did bone come from? An overview of its evolution, Acta Orthopedica, (June 2011), coauthors Wagner and Aspenberg stated the following in their explanation of evolutionary theories on bone origin processes from mineralized tissues:
“So, how did mineralized tissues develop in the first place? What factors forced the first organisms to develop protective shields?
Following the violent moves of tectonic plates about 1.5 billion (1.5 × 109) years ago, enormous amounts of minerals, including CaCO3, were washed into the oceans. This created the possibility for its inhabitants of developing hard body parts, such as shells or spines. At first, this helped unicellular organisms to cope with excessive amounts of minerals and to prevent over-crusting. It also led to a sharp increase in the diversity of multicellular organisms (and their fossils!) a little more than 0.5 billion years ago, known as the “Cambrian explosion” … Furthermore, the appearance of a rigid outside skeleton extended the effective length of limbs, thus permitting more rapid locomotion in many organisms. The appearance of mineralized body parts is seen by many scientists as one of the forces that generally increased the pace of animal evolution…
As much as exoskeleton added speed to the evolution of animal life in general and created opportunities for animals to expand their activity radius by using calcified extremities and protection shields, it also imposed limitations, associated mostly with limited body size and lack of surface sensory organs. In addition, rigid shells and shields did not allow much movement and locomotion; therefore, the next major change in the evolution of skeleton—dislocation of mineralized skeleton from the outside to the inside of animal bodies, proved to be a major adaptive advantage. Especially in animal lineages that later gave rise to vertebrates, the appearance of endoskeleton enabled the expansion of activity radius and habitation of entirely new environments… In addition, those developments encouraged the development of a strong muscular system and added further adaptive values such as greater overall mobility and the appearance of a regenerative and environment-sensitive outer dermis…”
Examination of these claims brings to the fore several issues. Firstly, this narrative is deeply flawed because it reduces the origin of bone to environmental pressures and chance adaptations, while ignoring the irreducible complexity of bone biology. Bone healing itself demonstrates that mineralized tissue is not simply a passive deposit of calcium carbonate but a living, dynamic system. Each stage of bone formation (and healing) depends on coordinated cellular activity and biochemical pathways. Evolutionary explanations that appeal to mineral availability cannot account for the origin of such orchestrated processes, since partial or incomplete mechanisms would not sustain survival, as a bone that fails to heal properly leaves the organism immobile and vulnerable.
As with other evolutionary explanations, a reductionist or gradualist view of bone formation does not align with the observed complexities and extraordinary precision required in each stage of healing. The inflammation stage, for example, is not a random response but a highly coordinated cascade of immune signals that recruit stem cells and prepare the site for repair. Similarly, the soft callus is not a crude patch, but a transitional scaffold that stabilizes the fracture while setting the stage for mineralization. Evolutionary narratives struggle to explain how such interdependent processes could arise step by step, since partial or incomplete mechanisms would not confer survival advantage.
The latter stages of hard callus formation and remodeling further highlight the inadequacy of evolutionary accounts. Woven bone must be replaced by lamellar bone with fibres aligned along stress lines, a process requiring osteoblasts and osteoclasts to work in perfect balance. This remodeling is not just repair but restoration of original architecture, ensuring strength and resilience. Evolutionary explanations that rely on trial-and-error mutations cannot adequately account for the emergence of such finely tuned cellular cooperation. So obvious is the fact that bones are indeed designed, that the article by Wagner and Aspenberg (2011) explicitly describes bones as being designed (see subtitle: “From outer to inner protection: design combined with fortuitous circumstances”. While the authors maintain reference to hypothesized evolutionary mechanisms, the precision of bone healing makes even evolutionists allude to design.
Make no bones about it….
Making no bones about it, the precise processes involved in bone healing highlight key principles of intelligent design in bone biology. The discovery of the bone generating mechanisms of wool-derived keratin that generates bone that is structurally aligned and secure, shows that bone healing and strength depends not only on volume but on the precise arrangement of fibres and minerals. Alignment is necessary down to the cellular level for regeneration to be most effective.
This discovery not only advances medical science but also illuminates the intricacies of bone biology. It also reminds us of the spiritual truth of God’s wisdom and intentional care for us in carefully shaping not only our spiritual being but also our physical being. As the Psalmist rightfully states:
“You created every part of me; you put me together in my mother’s womb. I praise you because you are to be feared. All you do is strange and wonderful. I know it with all my heart. When my bones were being formed, carefully put together in my mother’s womb, when I was growing there in secret, you knew that I was there—you saw me before I was born.” (Psalm 139:15-16, GNT).
Therefore, whether we are injured or have fully whole bones, let us sincerely praise God for His wisdom and goodness.
Dr. Sarah Buckland-Reynolds is a Christian, Jamaican, Environmental Science researcher, and journal associate editor. She holds the degree of Doctor of Philosophy in Geography from the University of the West Indies (UWI), Mona with high commendation, and a postgraduate specialization in Geomatics at the Universidad del Valle, Cali, Colombia. The quality of her research activity in Environmental Science has been recognized by various awards including the 2024 Editor’s Award from the American Meteorological Society for her reviewing service in the Weather, Climate and Society Journal, the 2023 L’Oreal/UNESCO Women in Science Caribbean Award, the 2023 ICETEX International Experts Exchange Award for study in Colombia. and with her PhD research in drought management also being shortlisted in the top 10 globally for the 2023 Allianz Climate Risk Award by Munich Re Insurance, Germany. Motivated by her faith in God and zeal to positively influence society, Dr. Buckland-Reynolds is also the founder and Principal Director of Chosen to G.L.O.W. Ministries, a Jamaican charitable organization which seeks to amplify the Christian voice in the public sphere and equip more youths to know how to defend their faith.