Biomechanics and Prosthetics: Exploring the Intersection of Technology, Engineering, and Human Performance

Biomechanics and prosthetics are medical fields concerned with designing and fitting artificial limbs to those who need them. Biomechanics and prosthetics aim to improve mobility and functionality in those with disabilities, injuries, or amputations through the use of advanced technology and innovative research.

Through a thorough understanding of human anatomy and the application of engineering principles, biomechanics takes the user’s body mechanics into account when designing prostheses that are comfortable, safe, and functional. Prosthetic devices have come a long way over the years, with new advances in technology leading to the development of prosthetic limbs that can be controlled with the user’s thoughts or movements. This has made it possible for people with disabilities or amputations to live more active and independent lives. In this article, we will explore the field of biomechanics and prosthetics in greater detail, looking at how these technologies work, how they are designed and developed, and how they are used today in modern medicine.

Biomechanics and Prosthetics: Exploring the Intersection of Technology, Engineering, and Human Performance

Credit: news.mit.edu

Table of Contents

Biomechanics


Definition Of Biomechanics


Biomechanics is the study of how living systems, including humans, move. It is an interdisciplinary field that combines principles from physics, engineering, biology, and medicine to observe, measure, and analyze the mechanical forces acting on the body during movement.

Explanation Of How Biomechanics Applies To Prosthetics


Prosthetics are artificial limbs or devices designed to replace natural limbs or body parts that have been lost due to injury, illness, or birth defects. Plays a crucial role in designing prosthetics that are functional and comfortable for the wearer.

By studying the movement and forces of natural limbs, biomechanists can create prosthetics that closely mimic the mechanical properties of the missing limb.

How Biomechanics Help In Designing Prosthetics


Biomechanical principles are used to design prosthetics that are comfortable, functional, and meet the user’s specific needs. Biomechanists work with prosthetists to create devices that fit the wearer’s unique body shape and provide the necessary support and stability for movement.

Biomechanical analysis is also used to develop prosthetic components that can replicate the mechanical properties of natural limbs, such as the range of motion and joint angles.

Applications Of Biomechanics In Prosthetics Research


Biomechanics is used in prosthetics research to improve the design, function, and performance of prosthetic devices. Researchers use biomechanical models to better understand the forces and movements involved in walking, running, and jumping. By studying the biomechanical factors that influence performance, researchers can develop new prosthetic devices and technologies that can enhance mobility and quality of life for amputees.

Biomechanics is an essential field of study that plays a crucial role in designing prosthetic devices. By understanding the mechanical forces involved in movement, biomechanists can create prosthetics that are comfortable, functional, and meet the needs of the wearer. Biomechanics research is also driving innovation in prosthetic technology, and improving the lives of millions of people around the world.

Prosthetics


Definition Of Prosthetics


Prosthetics are artificial body parts designed to restore the function or appearance of a missing limb or body part. They are typically customized to meet the specific needs of the patient and can be made out of a range of materials including plastics, metals, and carbon fibre.

Types Of Prosthetics


There are several types of prosthetics available, each designed to meet the specific needs of the user.

  • Upper limb prosthetics: these are designed for individuals who are missing all or part of their arm or hand. They can range from basic hooks to advanced myoelectric devices that are activated by the user’s muscles.
  • Lower limb prosthetics: these are designed for individuals who are missing all or part of their leg. They can range from basic prostheses to advanced computer-controlled devices that allow for natural movement and increased mobility.
  • Facial prosthetics: these are designed for individuals who have suffered facial trauma or have had facial surgery. They include prosthetic noses, ears, and eyes.
  • Breast prosthetics: these are designed for women who have undergone a mastectomy. They can be either external or surgically implanted.

Latest Advancements In Prosthetics Technology


Advances in prosthetic technology have made it possible for amputees to lead more fulfilling and active lives.

  • Myoelectric prosthetics: these are prosthetic devices that are controlled by the user’s muscle signals. They allow for more natural and intuitive movement.
  • Osseointegration: this is a surgical procedure that involves attaching the prosthetic device to the bone. It allows for greater stability and improved functionality.
  • 3d printing: this technology has made it easier and more affordable to create customized prosthetic devices.
  • Brain-controlled prosthetics: these are prosthetic devices that are controlled by the user’s thoughts. They are still in the experimental phase but hold great promise for the future.

How Prosthetics Help People Lead Better Lives


Prosthetics can have a significant impact on the lives of individuals who have lost a limb or body part.

  • Increased mobility and independence: prosthetics can allow individuals to resume activities such as walking, running, and driving.
  • Improved self-esteem: prosthetics can help individuals feel more confident and less self-conscious about their appearance.
  • Enhanced quality of life: prosthetics can allow individuals to participate in activities that they enjoy and lead a more fulfilling life.

Challenges In Designing And Developing Prosthetics


Designing and developing prosthetics is a complex process that involves many challenges.

  • Customization: prosthetics need to be customized to meet the specific needs of the individual. This can make the design and manufacturing process more complex and time-consuming.
  • Cost: prosthetics can be expensive, and not everyone can afford them.
  • Durability: prosthetics need to be durable enough to withstand the wear and tear of everyday use.
  • Comfort: prosthetics need to be comfortable to wear for extended periods to prevent skin irritation and chafing.

Biomechanics and Human Performance


Biomechanics And Prosthetics: The Human Connection


Advancements in the field of biomechanics and prosthetics are providing a significant impact on the lives of millions of people worldwide. These technological developments are crucial in restoring and improving the quality of life of individuals with amputations or physical disabilities.

In this article, we explore the human connection between biomechanics and prosthetics, and how these two fields work together to enhance human mobility and performance.

The Importance Of Understanding Human Anatomy And Physiology In The Development Of Prosthetics


Prosthetics are artificial body parts that are designed to perform specific functions that the human body cannot perform after an amputation. The development of effective prosthetics requires a strong understanding of human anatomy and physiology.

  • The design of prosthetics is based on the structure and function of the missing body part.
  • Prosthetic limbs are custom-made to fit individual user’s anatomy to ensure proper alignment and function.
  • Material selection for prosthetics is crucial to ensure that the prosthetic can withstand the body’s weight and movements.
  • Accurate measurement of the residual limb is important to achieve optimal comfort and fit of the prosthetic.

The Role Of Prosthetics In Improving Human Performance


Prosthetics are used not only to restore lost functions but also to enhance human performance.

  • Prosthetic limbs provide amputees with increased mobility and independence.
  • Prosthetics allow athletes with disabilities to compete in sports at a high level.
  • Prosthetic devices such as exoskeletons are being used to augment human strength and endurance.
  • Advancements in prosthetics provide an improved quality of life for individuals with physical disabilities.

The Impact Of Biomechanics And Prosthetics On Human Mobility


Prosthetics and biomechanics work together to improve human mobility.

  • Biomechanical research helps in the development of prosthetic devices that are comfortable, lightweight, and have a natural range of motion.
  • Prosthetics with microprocessors and sensors mimic the body’s natural movements, making it easier for amputees to walk or perform tasks.
  • Advancements in prosthetic designs are improving the walking speed and endurance of amputees.
  • Prosthetics are aiding in the restoration of sensation and proprioception, allowing amputees to better understand the position of their prosthetic.

Advancements in biomechanics and prosthetics are providing a human connection that is improving the quality of life for individuals with physical disabilities. Prosthetics have come a long way, and the future is promising with advancements in technology and research for better prosthetic designs that will provide more comfort, better function, and an improved quality of life for amputees and individuals with physical disabilities.

Prosthetics And Robotics


The Role Of Robotics In Prosthetics


The use of robotics in prosthetics has revolutionized the field of prosthetic devices. The main aim is to develop prosthetic devices that simulate natural movements and offer a high degree of control to the user.

  • Robotics provides a new dimension to prosthetic devices by allowing for a more precise and efficient control mechanism.
  • The integration of robotics has enabled prosthetic devices to mimic natural movements, allowing users to perform activities like walking, running, and gripping objects with ease.
  • Robotics has also made prosthetic devices more durable and resistant to wear and tear.

Advancements In Robotic Prosthetic Technology


The advancements in prosthetic technology have led to more advanced prostheses that are capable of offering a high degree of control to the users.

  • The development of myoelectric prostheses that rely on muscle signals to generate movement.
  • The use of sensors that can be attached to the prosthetic devices to provide feedback to the user.
  • The development of specialized prosthetic devices for sports activities like running, swimming, and cycling.

Benefits And Drawbacks Of Using Robots In Prosthetics


While the use of robotics in prosthetics has enabled tremendous advancements, there are also a few drawbacks to consider.

Benefits


  • Increased mobility and flexibility for the users.
  • Improved quality of life and independence.
  • Better durability and resistance to wear and tear.
  • Users can perform complex tasks with ease.

Drawbacks


  • High cost of production and maintenance of prosthetic devices, making them unaffordable for some individuals.
  • Lack of sensory feedback, which can make it difficult for users to operate the prosthetic device accurately.
  • Limited compatibility with different types of prosthetic devices.

Challenges In Integrating Robotics With Prosthetics


The integration of robotics with prosthetics poses several challenges that must be addressed to ensure that prosthetic devices are fully functional.

  • Design limitations that affect the size, weight, and power consumption of the prosthetic device.
  • Difficulties in attaining compatibility between different prosthetic components.
  • Lack of standardization in the design and function of prosthetic devices.
  • Difficulty in providing the required sensory feedback to the user.

The use of robotics in prosthetics offers a lot of potential for advancing prosthetic devices’ functionality and the quality of life of people with amputations. While there are still several challenges to overcome, the integration of robotics in prosthetics has already provided significant advancements and benefits.

Materials Science And Prosthetics


Biomechanics is a field in science that studies the movement of living organisms, including humans. This interesting and complex field plays a significant role in the development of prosthetics, where the goal is to improve the quality of life for people who have lost their limbs.

One essential aspect of prosthetic design is materials science. In this section, we will explore the importance of material science in designing prosthetics, the evolution of materials used in prosthetics, benefits, and limitations of different materials, and the future of materials science in prosthetics.

Importance Of Material Science In Designing Prosthetics


The right materials can make a significant difference in the functionality, durability, and comfort of prosthetics. With advancements in materials science, it is now possible to create prosthetics that are lighter, stronger, and more comfortable for the user.

  • Quality materials are essential in creating prosthetics that mimic natural movement and provide enhanced functionality.
  • Careful selection of materials can significantly improve the durability of the prosthetics, making them more cost-effective for users in the long run.
  • Prosthetics should be comfortable, lightweight, and non-allergenic, and the right material selection assures these features.

Evolution Of Materials Used In Prosthetics


The materials used in prosthetics have come a long way over the years. The first prosthetics were made of wood and iron, followed by plastics and fiberglass, and modern-day prosthetics are made of advanced composite materials, including carbon fiber.

  • With advancements in materials science, more durable, stronger, and lightweight prosthetic materials are now available.
  • Modern-day prosthetics have become more advanced in both design and materials, leading to improved mobility and functionality.
  • With further developments in prosthetic materials, prosthetics will continue to look, feel and behave like natural limbs.

Benefits And Limitations Of Different Materials For Prosthetics


Different materials used in prosthetics come with their unique benefits and limitations. As a prosthetist, understanding the benefits and limitations of each material is essential in designing the best device for a patient.

  • Metals like aluminum and titanium are strong, long-lasting, and provide excellent support but they are heavy.
  • Plastics like polypropylene and polyethylene are lightweight and durable but may not provide enough support for more advanced prosthetics.
  • Carbon fiber and other composite materials are strong, lightweight and allow for more natural, fluid movement but tend to be more expensive.

The Future Of Materials Science In Prosthetics


Materials science is an ever-evolving field, and the future of materials science in prosthetics is promising. With modern materials and technology, artificial limbs can continue to mimic natural movements and behaviors.

  • With advancements in materials science, prosthetics will continue to become stronger, lighter, and more durable, enhancing user mobility and comfort.
  • Incorporating smart technology, such as sensors and microprocessors, will further improve prosthetic functionality and control.
  • Changes in materials science will improve the suitability of prosthetics for a wider range of activities and lifestyles.

Materials science plays a pivotal role in the design of prosthetics, defining the overall functionality and durability of prosthetics. As technologies advance and materials science progresses, prosthetics will continue to become more advanced and comfortable, offering users a better quality of life.

Human-Machine Interface In Prosthetics


Biomechanics and prosthetics is an exciting and rapidly evolving field, especially concerning the interface between humans and machines. Prosthetics, in particular, has seen some significant advancements in the field of human-machine interface (hmi). Here, we will explore the concept of hmi, its advancements and applications in prosthetics, as well as the benefits and drawbacks of such technology.

The Concept Of Human-Machine Interface


In simple terms, hmi refers to the technology that allows humans to interact with machines or vice versa. In the context of prosthetics, it refers to the integration of prosthetic limbs with the human nervous system. Prosthetics with advanced hmi can provide greater control, accuracy, and movement range for the user.

The interface can be achieved through a range of techniques, including invasive methods, non-invasive methods, and direct neural control.

Advancements In The Human-Machine Interface Technology And Application In Prosthetics


The advancements in hmi technology for prosthetics have been remarkable, allowing for personalized prosthetics to meet the needs of each individual user. Innovations, such as targeted muscle reinnervation (tmr), myoelectric control, and osseointegration, have improved prosthetic functionality and user satisfaction.

Targeted muscle reinnervation allows for the control of prosthetic limbs through the re-routing of nerves to control muscles in the residual limb. Myoelectric control uses sensors placed on the skin surface to detect muscle contractions, allowing for more nuanced conntrol over the prosthetic.

Osseointegration involves inserting a titanium implant into the bone, providing a stable platform for prosthetic attachment.

Benefits And Drawbacks Of Hmi In Prosthetics


There are numerous benefits of incorporating hmi technology into prosthetics, such as:

  • Greater user control and precision of movement
  • Improved prosthetic functionality and efficiency
  • Better physical and mental health outcomes for the user

However, there are also some disadvantages, such as:

  • Costly technology that not all users can access
  • Invasive or complex surgical procedures
  • Technical or maintenance issues

The Importance Of Hmi On The Prosthetic Industry


The advancement of hmi in prosthetic technology has revolutionized the field, providing solutions for improved functionality and efficiency. The integration of prosthetics and human physiology has greatly improved the quality of life for many amputees, and the technology will continue to advance in the coming years.

Hmi represents a significant step forward in prosthetics, easing the burden on amputees and providing them with advanced, personalized solutions.

Impact Of Biomechanics And Prosthetics In Sports And Fitness


Biomechanics and prosthetics go hand in hand, with the progress in technology widening opportunities for amputees to participate in various activities. One field that has seen a significant impact is sports and fitness. Let’s delve into the impact of biomechanics and prosthetics in this area.

Impact Of Biomechanics And Prosthetics On Sports And Fitness Industries


  • Advancements in prosthetics technology have made it possible for athletes with amputations to compete with their able-bodied counterparts.
  • Biomechanics has contributed to prosthetics success by enabling designers to create devices that help amputees mimic natural joint movement.
  • By embracing prosthetics, sports teams & industries are promoting diversity and inclusion.

The Role Of Prosthetics In Enabling Athletes To Perform At The Highest Levels


  • Prosthetics have opened up previously unattainable athletic opportunities for amputees, including track and field, swimming, and basketball, in which they can compete at elite levels.
  • Well-crafted prosthetics can enhance athletic performance and are designed to meet the needs of the athletes.
  • The prosthetic specialist’s role is to develop customized prosthetics that cater to an athlete’s specific requirements and physical ability.

Advancements In Technology And What They Mean For Sports


  • Technological advancements have transformed the prosthetics industry by introducing modern materials, decreasing production costs, and reducing production times.
  • Robotic prosthetic technology, such as prosthetic knees that alter their behavior based on an athlete’s movements, has the potential to revolutionize the sports and fitness industry.
  • Modern prosthetics focus on the amputee’s needs, emphasizing how they move and perform in their daily activities.

Ethical Considerations Around The Use Of Prosthetics In Sports


  • Sports federations and governing bodies regulate the use of prosthetics in competitive sports to ensure fairness.
  • Specifying the design and dimensions of prosthetics is crucial to prevent the exploitation of technology to achieve an unfair advantage.
  • The debate over whether or not prosthetics provide an advantage in certain sports remains unsettled, with some arguing for allowing athletes full access and others advocating stringent regulations.

Clinical Considerations In Prosthetics


Prosthetics are artificial body parts that can help to improve the physical abilities of individuals who have lost a natural limb or body part due to an injury or disease. Clinical considerations in prosthetics are critical aspects of prosthetic design, rehabilitation, and patient care that prosthetists and physicians need to address.

In this section, we will look into collaborative works between prosthetists and physicians, clinical aspects of prosthetics, considerations in selecting the right prosthetic devices, and challenges in achieving the best fit for prosthetics.

Collaborative Work Between Prosthetists And Physicians


Collaborative work between prosthetists and physicians is crucial for successful prosthetic rehabilitation. Physicians evaluate patient health, rehabilitation status, and readiness for prosthetic fitting. Prosthetists, on the other hand, design, fabricate, fit, and adjust prosthetic devices. Collaboration between these two professions provides optimal rehabilitation outcomes and improves the patient’s overall quality of life.

Clinical Aspects Of Prosthetics


Various clinical aspects affect prosthetics’ design, adjustment, and customization.

  • Type and level of amputation
  • Age, weight, gender, and height of the patient
  • Type and level of activity patient would like to engage in
  • Bone density and soft tissue condition surrounding the residual limb

Considerations In Selecting The Right Prosthetic Devices


Choosing the right prosthetic device is essential for the patient’s physical and emotional well-being.

  • Functionality: the prosthetic devices’ design should address the patient’s specific functional needs.
  • Cost: the prosthetic device should be affordable and provide value for its cost.
  • Comfort: the prosthetic device should be comfortable and not cause any discomfort, pain, or skin irritation.
  • Durability: the prosthetic device should be durable and robust enough to withstand the patient’s daily activities and environmental factors.

Challenges In Achieving The Best Fit For Prosthetics


Achieving the best fit for prosthetics takes time and patience from both the patient and prosthetist.

  • Residual limb volume fluctuations: the residual limb’s size can fluctuate, making it challenging to achieve the best prosthetic device fit.
  • Skin irritation: prosthetic devices can cause skin irritation, which can be uncomfortable for the patient.
  • Prosthetic alignment issues: prosthetic devices’ alignment may be off, causing the patient’s gait or balance to be unstable.
  • Psychological factors: patients may undergo emotional and psychological stress and anxiety during prosthetic rehabilitation, leading to decreased motivation.

The above-listed clinical considerations in prosthetics are critical and ensure optimal prosthetic rehabilitation outcomes. Prosthetists and physicians need to work collaboratively to provide customized treatment plans and improve patients’ overall quality of life.

Emerging Fields In Biomechanics And Prosthetics


Biomechanics and prosthetics have seen significant advancements in recent years, with emerging fields bringing cutting-edge technology to the industry. These advancements have led to a better understanding of biomechanics and the development of state-of-the-art prosthetics. In this blog post, we will explore the emerging fields in biomechanics and prosthetics, highlighting trends, potential applications, and areas of research still unexplored.

Trends And Future Developments In The Field Of Biomechanics And Prosthetics


The field of biomechanics and prosthetics is continuously evolving, with new technologies and trends emerging.

  • Integration of robotics: robotics is set to revolutionize the field of prosthetics. Researchers are working on integrating robotics with prosthetic limbs to create a more precise and responsive movement.
  • 3d printing: 3d printing technology is enabling the creation of custom-made prosthetic limbs and braces. This technology provides a faster and affordable option for those in need of prosthetic devices.
  • Wearable technology: smart prosthetics are the next big thing in the field of biomechanics. Devices that can monitor body movements and enhance performance are being developed.
  • Neuroprosthetics: neuromuscular prosthetics use electrical signals to stimulate nerves and muscles, allowing amputees to control their prosthetic limbs.

Areas Of Research Still Unexplored


Despite the significant advancements in the field of biomechanics and prosthetics, there are still areas of research that remain unexplored.

  • Bionic limbs: although some bionic limbs have been developed, there is still a lot of work to be done in improving the technology and making them more affordable.
  • Brain-machine interfaces: the use of brain-machine interfaces (bmi) is not yet widely available. There is still research to be done on the long-term effects and improvement of the technology.
  • Regenerative medicine: researchers are exploring ways of using regenerative medicine to stimulate the regrowth of damaged tissue. This technology could potentially eliminate the need for prosthetic limbs.

Potential Applications Of Biomechanics And Prosthetics


The potential applications of biomechanics and prosthetics are endless.

  • Rehabilitation: biomechanics and prosthetics can be used to help individuals undergoing rehabilitation after an injury or surgery. Prosthetics can help to restore mobility and function, allowing patients to recover more quickly.
  • Sports performance enhancement: biomechanics technology can help to monitor body movement and optimize sports performance. Wearable technology can also enhance performance by providing instant feedback on performance.
  • Aging population: as the population continues to age, the use of prosthetics and biomechanics technology will become more prevalent. This technology can help to improve mobility and enhance the quality of life for seniors.

The Future Of Prosthetics Research


The future of prosthetics research is bright, with more advancements expected in the coming years. Researchers are working on developing prosthetic devices that are more responsive, functional, and affordable. The potential applications of this technology are vast, with the ability to enhance mobility and maximize sports performance.

The future of prosthetics research is geared towards improving the lives of individuals with limb deficiency and mobility impairments.

Legal And Ethical Considerations In Biomechanics And Prosthetics


Biomechanics and prosthetics are important fields that have significantly enhanced the lives of people with disabilities. However, the incorporation of prosthesis into daily life poses legal and ethical challenges which need to be addressed. In this section of the post, we will discuss some of the key legal and ethical considerations in biomechanics and prosthetics.

Legal And Ethical Challenges Surrounding The Use Of Prosthesis


The use of prosthesis is generally seen as a positive development as it allows people with disabilities to perform daily tasks that would have otherwise been impossible. However, as prosthetics become more advanced, several ethical and legal challenges have arisen around their use.

  • Privacy concerns: prosthesis often collect data about the user, such as activity levels and location. This data can be used to improve the design of prosthetics, but it also raises privacy concerns.
  • Equity issues: while prosthesis are becoming more advanced and affordable, there are still many people who cannot afford them. This creates an equity issue where only wealthy individuals can access the latest advancements in prosthetics.
  • Liability concerns: prosthesis can malfunction, potentially causing harm to the user or others. Establishing liability for such accidents can be challenging.

Government Regulations Around The Use Of Prosthetics


Governments play a vital role in regulating the use of prosthetics.

  • Us fda regulations: in the us, the food and drug administration (fda) is responsible for regulating medical devices, including prosthetics. The fda ensures that prosthetics are safe and effective before they are sold on the market.
  • European union regulations: the european union has established regulations that ensure that prosthetics meet high standards of safety, efficacy, and quality.
  • Insurance coverage: in many countries, insurance companies are required to cover the cost of prosthetics, ensuring that people with disabilities have access to these devices.

The Impact Of Intellectual Property On The Prosthetic Industry


Intellectual property (ip) laws have a significant impact on the prosthetic industry.

  • Patents: many advancements in prosthetics are protected by patents. This can create monopolies for the companies that hold these patents, potentially limiting competition and driving up prices.
  • Copycat products: ip laws protect companies from having their designs or products copied by competitors. However, this can limit innovation and slow down advancements in the industry.

Ethical Considerations In Designing And Developing Prosthetics


Designing and developing prosthetics requires careful consideration of several ethical issues.

  • Informed consent: users of prosthetics must be informed about the risks and benefits of using the device, and they must consent to its use. This can be challenging for individuals who lack decision-making capacity.
  • Stigma: prosthetics can further stigmatize individuals with disabilities if they are not designed well or are not aesthetically pleasing.
  • Responsibility: designers and manufacturers of prosthetics have a responsibility to ensure that their devices are safe and effective and that they do not harm users or others.

Overall, while advances in biomechanics and prosthetics have significantly improved the lives of people with disabilities, there are several legal and ethical considerations that must be considered as these technologies continue to evolve.

Frequently Asked Questions Of Biomechanics And Prosthetics


Faqs On Biomechanics And Prosthetics


Here are the answers to some of the most commonly asked questions about biomechanics and prosthetics.

Conclusion


Incorporating biomechanics in the design and development of prosthetics has significantly improved the quality of life for amputees. The use of advanced materials and technology has led to prosthetics that are highly functional, comfortable, and aesthetically pleasing. The integration of sensors and feedback systems has also allowed for better motor control, balance, and proprioception.

However, there is still much research and development required to perfect prosthetic technology as it is still far from perfect. Future research should focus on developing prostheses that can mimic the complex movements of natural limbs and reduce the risk of complications such as skin irritation, sweating and discomfort among amputees.

Biomechanics will remain an essential component in further advancing prosthetic designs to meet the ever-evolving needs of patients. With continued efforts, prostheses will continue to evolve and improve, enabling amputees to lead more normal lives and achieve greater independence.