With advances in technology and design and the changing user expectations, lower limb prosthetics have experienced significant changes since the initial introduction of these devices. This paper examines how lower limb prosthetics have changed from simple mechanical devices to modern systems. These changes have been made through research, science, and user-centred design approaches. The paper looks at major areas surrounding the development of prosthetics for lower limbs, which include changes and improvements of materials over the years, design modifications to accommodate movement and comfort, and the ever-increasing impact of digital technology on prosthetic development. Issues related to the affordability, accessibility, and sustainability of lower limb prosthetics are also considered in the context of who benefits from modern-day lower limb prosthetics. Placing the design of lower limb prosthetics in the context of both the technical and social aspects helps to create a clear framework to identify the factors that comprise modern-day lower limb prosthetics and also assists in determining how future innovations in prosthetic technology will further enhance a person's ability to be mobile and independent.