Why is building a bioartificial limb more difficult than building a single tissue?

Building a bioartificial limb is significantly more complex than engineering a single tissue because limbs are composed of multiple, distinct tissue types organized into specific compartments. These diverse components must work in precise coordination to facilitate complex movements and biological functions.1

In contrast, single-tissue engineering typically involves seeding specific cells onto a scaffold to replicate a more uniform structure, such as cartilage or skin. Creating a limb requires the successful integration of various precursors—such as muscle and vascular cells—that must mature, expand, and function together within a complex, decellularized framework. Furthermore, the limb must be capable of being perfused with blood and responding to electrical stimulation to achieve functional movement, representing a much higher level of structural and physiological integration than is required for isolated tissue substitutes.21