Final answer:
A crucial criterion for knee replacement design is the proper alignment of the prosthetic components, which is ensured using specialized tools and computer-assisted techniques. Durability is also a focus, with materials like carbon fiber being researched to improve prosthesis lifespan.
Step-by-step explanation:
One criterion the design of a knee replacement should meet is the proper alignment of the prosthetic components. This alignment is critical for the knee to function correctly and to ensure the longevity of the implant. To ensure proper alignment during knee replacement surgery, surgeons often use specialized tools and computer-assisted surgery techniques to accurately measure and place the components. These methods help in achieving the best possible outcome for the patient's mobility and comfort. Moreover, ongoing research in the field of prosthetic design emphasizes the use of new materials, such as carbon fiber, to enhance the durability of prostheses.