Human bodies are able to withstand great forces and destroy unwanted foreign bacteria. However, the body can only handle so much. Sometimes, the effects of car accidents, war, animal attacks and bacterial infections cause excessive trauma with the only means of saving a person's life being amputation. Biomedical engineers and doctors work together to continually improve and creatively invent amazing prosthetic devices to enable people to complete daily life tasks efficiently and effectively.
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Summary Students are introduced to prosthetics&#;history, purpose and benefits, main components, main types, materials, control methods, modern examples&#;including modern materials used to make replacement body parts and the engineering design considerations to develop prostheses. They learn how engineers and medical doctors work together to improve the lives of people with amputations and the challenges faced when designing new prostheses with functional and cosmetic criteria and constraints. A PowerPoint® presentation and two worksheets are provided.
New technologies can have deep impacts on society and the environment, including some that were not anticipated. Analysis of costs and benefits is a critical aspect of decisions about technology.
Humanity faces major global challenges today, such as the need for supplies of clean water and food or for energy sources that minimize pollution, which can be addressed through engineering. These global challenges also may have manifestations in local communities.
Criteria and constraints also include satisfying any requirements set by society, such as taking issues of risk mitigation into account, and they should be quantified to the extent possible and stated in such a way that one can tell if a given design meets them.
In addition to working together to continually enhance the design of replacement body parts&#;which includes dentures, eyes, facial bones, hips, knee joints, arms and legs&#;biomedical engineers and medical doctors are creatively innovating radical new ideas for prostheses. For example, they are able to attach muscles to electrodes connect to the prostheses. The muscles send information to the prosthesis, such as contracting or relaxing, and the prosthesis performs the movements, making it seem as though it is a functioning and communicating part of the body. And, this is just the beginning of future prosthetic design&#;for example, tissue engineering may someday enable us to regenerate entire replacement limbs.
Thousands of years ago, the first replacement body parts (prostheses) were made by the Egyptians. They were simple wooden, plaster or metal devices to replace lost toes and fingers. As technology improved, prostheses evolved to use composite materials such as polymers and carbon fiber. Early prostheses enabled amputees to maintain their basic daily life activities, while modern day prostheses enable people to pursue more demanding adventure lifestyles as well. Athletes run on carbon fiber prosthetic legs that mimic the capabilities of feet as they push on the ground. Variations in prosthetic feet shapes can mimic swimming, walking and dancing in heels. But are these the limits of prostheses? This brain-controlled modular prosthetic limb is controlled by surface electrodes that pick up electric signals generated by the muscles underneath the skin. The electrodes then convert those patterns into a robotic function. copyright Copyright © U.S. Navy http://blog.usa.gov/post//image-description-this-brain-controlled-modular
The purpose of this lesson is to give students a good background on prosthetics and how prostheses evolved over time into the current offering of prostheses, which are marvelous feats of engineering. As you show students the 10-slide No More Hooks and Peg Legs Presentation, a PowerPoint® file, incorporate the following information. Following the powerpoint, refer to the fun and hands-on associated activity A Zombie Got My Leg Challenge: Making Makeshift Legs where students experience the engineering design process as they design and construct lower-leg prostheses in response to a hypothetical zombie apocalypse scenario.
(slide 2) Whether due to car accidents, wars, animal attacks (shark!), birth defects or bacterial infection, sometimes body parts, including major limbs, are damaged, missing or amputated to save peoples' lives. Classic images of prostheses include Captain Hook from Peter Pan and other pirates with peg legs. The history of replacement body parts, or prostheses, can be traced to the ancient Greeks, Romans and Egyptians; for example, -year-old mummies have been found with prosthetic toes and fingers. Before the s, most people did not survive the amputation process due to the side-effects of shock, infection and blood loss. The medicine and tools at the time were limited, and prosthetic supplies were scavenged from whatever was available. Starting in , anesthesia was used during surgery, which enabled more precise surgeries and resulted in better prosthetic fits. The great number of amputees from the two World Wars in the 20th century increased the demand for more and better prosthetic designs.
(slide 3) What is the purpose of prostheses and why are they important? The purpose of a prosthesis is to restore the functionality and capabilities of the lost limb. A prosthesis enables an amputee to reestablish mobility, independently conduct the activities of daily living, and keep a job.
What design challenges do engineers face in creating prostheses? One consideration is the location of the amputation. Does the replacement device need to include a movable joint, such as a knee or elbow? Will the prosthesis be designed to improve appearance only (cosmetic), such as an eye or ear, or does it need to perform some of the lost functions of the original limb, such as vision and hearing? The location on the body determines the necessary functions of the prosthesis so as to enable the person to resume daily life activities. Another consideration is the strength of the prosthesis compared to its weight. The material needs to be strong enough to perform the necessary functions and hold body weight if necessary but light enough to be moved easily. Another consideration is the attachment. How will the prosthesis be attached to the body? How do we keep it from falling off? Another consideration is cost. What materials are available to use? How much do they cost? Is the cost reasonable so that patients can afford the prostheses? These considerations and requirements become what engineers call the design criteria and constraints.
(slide 4) If we examine a simple prosthetic limb, such as one for a leg, we can see it is composed of four basic parts: interface, components, foot and cover. The interface, or socket, is where the prosthetic device meets the remaining part of the limb. This part usually includes a suspension system that uses some kind of attachment method, one of three techniques: 1) a suction valve that forms a seal with the limb, 2) a locking pin, or 3) a belt and harness. Another basic part is the components or pylon, which are the internal working parts of the prosthesis. The third basic part is the foot, which is an attachment that simulates the lost limb and helps with walking and balancing. Of course, for an arm prosthesis, this would be a hand. The fourth basic part is a cover, which is an outer covering to make it look more lifelike.
(slide 5) Let's talk about the four main types of artificial limbs. Transradial is a type that replaces an arm below the elbow including the wrist, hand and fingers. The transhumeral type replaces an arm above the elbow including the elbow, wrist, hand and fingers. The transtibial type replaces a leg below the knee, including the ankle, foot and toes. The transfemural type replaces a leg above the knee, including the knee, ankle, foot and toes. The more joints that are included in a prosthesis, the more complicated the design must be in order to provide the complexity of movements and functions.
(slide 6) One huge prosthetic advancement is the evolution of modern materials, which can make artificial parts stronger, lighter and more realistic in appearance and use. Some of the materials that have improved the designs are advanced plastics, carbon fiber composites and electronic components for control.Microprocessor-controlled knee prostheses help people climb stairs (left) and run races (right).copyright
Copyright © (left) U.S. Army via Wikimedia Commons; (right) Tim Hipps, U.S. Army via Wikimedia Commons http://commons.wikimedia.org/wiki/File:Flickr_-_The_U.S._Army_-_Patient_at_Walter_Reed_test_next-generation_prosthesis.jpg http://commons.wikimedia.org/wiki/File:Flickr_-_The_U.S._Army_-_U.S._Army_World_Class_Athlete_Program_Paralympic.jpg
(slide 7) What are different categories or types of modern prostheses? If we examine some examples, we can see the advancement of materials and corresponding increase in possibilities for patients. In specialty prostheses, carbon fiber can be used to enable people to run like they were able to before amputations. The carbon fiber is light enough for the patient to move it quickly and easily, yet strong enough to hold more the than the weight of the person. It also gives the person a slight bounce, just like our feet do. In functional prostheses, electronic systems can be utilized to enable a person to pick up items and catch balls during sports.
(slide 8) Advanced plastics enable cosmetic prostheses to be more lifelike. In some cases, it is not apparent that people have prostheses unless they tell you. For example, look at these eyeballs and hands. These current-day prostheses are the opposite of the cruder types before modern materials (aka peg legs and hooks).
(slide 9) The future of prostheses lies in the level of functional capabilities provided by the inventions and their electronic systems. In the s, cable control systems were often used for people with transradial prostheses. Different body motions&#;such as a shrug or arm extension&#;caused the external cable to move, resulting in the hand moving as desired. Today, we use electrodes that are attached or implanted in the residual limb. These electrodes sense the muscles and are able to know how the hand should move as if it were attached. If the residual limb is from a transhumeral amputation, more muscles are needed for the electrodes to understand how the hand should move. Engineers are also working with medical doctors to implant electrodes in the brain to utilize neuron signals to control residual limb muscles. This approach has great potential to result in prostheses that enable people to have fully functional moving limbs again.
(slide 10) To accomplish their goals when designing prostheses, biomedical and mechanical engineers rely on their thorough understanding of a variety of subjects including anatomy, neurology, biomechanics, and sensor motor control. Applying what they know about these subjects enables engineers to design prostheses and other medical devices that can improve body mobility and function for patients.
A total of 18 eligible participants were approached by letter, of whom ten agreed to participate. On the day of the focus group, two participants unfortunately cancelled. Furthermore, two participants ultimately did not meet all inclusion criteria, as one had a transtibial amputation and the other had an osseo-integration. They did participate in the focus group, but their quotes were not included in the final analysis. The group consisted of 6 male and 2 female participants. The mean age was 60.6 years old (range: 40&#;78 years; ).
The participants agreed with the seven themes of the pre-final framework but had 14 suggestions for additional factors. Since four had a clear overlap with existing factors, eventually ten factors were added to construct the final framework ( ).
Theme 1: Prosthesis related
This theme contains factors related to the characteristics of the prosthesis.
Meta-synthesis
The appearance of the prosthesis was often mentioned as an important factor [19,29,33,35,37,41]. While most of the participants preferred the prosthesis to blend in and not be noticed easily, some participants did not mind about the appearance of the prosthesis as long as it was functional.
&#;After it happened to me and I had got the leg, this monstrosity of a thing with hinges and everything&#; You think oh my God look at that thing. But then you start to move and you realize that you are up and moving again. [&#;] I didn&#;t give a damn who was looking at me, I just wanted to get out and about&#;
[29]
The appearance of the prosthesis in combination with clothing was also discussed a number of times, since clothing can often conceal the physical impairment [19,29].
Participants mentioned that the wearing comfort and the fit of the prosthesis, specifically the socket, can have a great impact on their prosthesis use and satisfaction with the prosthesis [19,29&#;31,35&#;37]. It was reported that an improperly fitted prosthesis was the most common cause of stump pain [29].
&#;It is very frustrating. Sometimes you can get them and you can walk for miles and they will be grand. The next day you could put on the limb and it will start cutting you&#; It is the most annoying part.&#;
[29]
Three articles mentioned the importance of reliability and the frustration that comes with malfunctioning prostheses [29,30,33]. A malfunctioning or broken prosthesis left the users immobile and dependent on others [29].
&#;It happened to me at work one day when the knee went on it [knee buckled]. I just couldn&#;t move. Two fellas had to carry me out into another fella&#;s car to give me a lift home. The thing broke and you couldn&#;t move.&#;
[29]
The durability of the prosthesis can have an effect on a person&#;s work, activities and number of visits to the prosthetist for repairs [30,33,40]. Therefore all participants who mentioned this factor expressed an interest in durable prostheses.
Focus group
While discussing this theme, participants mentioned that reliability is an important factor to them. The prosthesis can sometimes act unpredictable or break down suddenly, which results in potential hazards and immobility for the user. Participants also mentioned that the fit of the prosthesis influences their prosthetic use and satisfaction. Fluctuations in the residual limb were mentioned as a reason for changing the fit of the prosthesis. Changes in the weather and temperature were discussed as possible explanations for these fluctuations.
&#;Everything depends on the socket. As soon as the socket doesn&#;t fit correctly, you are continually slowed down.&#;
[P3]
The participants also discussed the weight of the prosthesis. It was mentioned that the weight is not only an issue while wearing the prosthesis, but also when it is taken off.
&#;To me, the weight is not only decisive when I&#;m wearing it, but also when I&#;m not. With cleaning and things like that, I do think mine [prosthesis] is very heavy.&#;
[P3]
One of the participants also mentioned that even though the weight of the prosthesis is roughly the same as a healthy leg, it does feel heavier.
Lastly, the ability to change between multiple types of shoes, as well as the properties of the shoes were discussed, which resulted in the addition of the factor &#;shoe options&#; to the final framework. It was discussed how the weight, stiffness of the sole and height of the heel could influence the wearing comfort of the prosthesis. Furthermore, female participants expressed the desire to be able to change the heel height of their prosthesis in order to wear heels.
&#;I find it annoying that you can&#;t buy the shoes you want. They can&#;t be too slippery and I always have to do something about the heels.&#;
[P1]
Theme 2: Rehabilitation, costs and prosthetist
The theme consists of factors that are related to each aspect of rehabilitation after an amputation, receiving a prosthesis and the additional costs.
Meta-synthesis
Some participants experienced the rehabilitation program as an inadequate or insufficient resource [31]. However, the majority of the participants expressed their satisfaction about their rehabilitation program. It was a way to learn new skills and train with their prosthesis [30&#;34,36&#;39].
&#;Rehabilitation is important because it is helping me to return to my daily life and most importantly to walk again! I have hope in the prosthesis! It will help me become a different person and leave the wheelchair.&#;
[31]
Participants also had contradictory opinions about the expertise of guidance they received. Whereas some were enthusiastic about the rehabilitation staff others expressed that they felt like their prosthetist did not listen or lacked proper training [30].
&#;Rehabilitation has been very helpful for me&#; I am able to walk alone again! The staff has been lovely and I&#;m feeling like another person!&#;
[31]
Focus group
Throughout the focus group meeting, one factor that kept coming back into conversation was the health insurance procedure. Participants expressed a lot of frustration about rejections for certain prosthetic components and in one case being denied a trial period to test a specific prosthetic knee for a few weeks.
&#;Something that was missing for me was the ability to test [different components/prostheses]. I think it is essential. You can want all kinds of things, but if you notice it isn&#;t possible or it does not suit you&#;&#;
[P3]
Another participant mentioned that he was given one type of knee and had no other options.
&#;It was clear that I could just get this knee. It did not come up that anything else was possible. They [health insurer] thought I managed well enough on this mechanical knee.&#;
[P8]
Overall, the participants expressed the desire to have a clear, transparent communication between them and the rehabilitation team. The opinions about the user involvement in the process of choosing a prosthesis were mixed. Other participants did not recognise such experiences and explained that they were involved in the process by the rehabilitation team. They also felt supported in their &#;battle&#; with the health insurance company. Further along in the conversation, the importance of having a good relationship with the prosthetist was emphasized.
&#;Well, the most important thing is to have a prosthetist who understands what you need and how to go down those paths. But in addition to that, you have to have a health insurance company that grants it to you, because it&#;s just a grant-factor&#;&#;
[P5]
Something that the participants felt was missing, was available information about different types of prostheses and prosthetic components. They have to rely on the information they receive from the rehabilitation team, since the information online is very limited and subjective.
&#;I mentioned it from the beginning, you [rehabilitation team] can tell me what I need, but how am I supposed to know? I have to believe what you tell me, because there is no information available. The problem is that there&#;s not enough information to find about this [prostheses]. &#; Yes you can find a lot about the C-leg or Rheo knee, but that&#;s it.&#;
[P5]
Theme 3: Social
This theme consists of factors related to a person&#;s social relationships, their position in society and the associated reactions.
Meta-synthesis
Having a good support system in place can help prosthesis users with several aspects of life; for example: processing the amputation, dealing with finances and helping with tasks in and around the house. Receiving support from friends and family was often discussed, however not all participants specified what support they received. Friends and family mainly supported the prosthesis user with the acceptance of their situation [29&#;34,36,38].
&#;My family is the main reason for my recovery! They have been giving me a lot of support, helped me to walk again and to cope with this situation.&#;
[31]
Being able to talk to other persons with a lower limb prosthesis also had a positive influence on the participants. The presence of peer support was a good experience for the participants. Those who did not experience it during their rehabilitation phase expressed missing this, since the rehabilitation team can help but does not understand the full situation [29,32&#;34,38].
&#;I feel support groups are extremely important. Doctors and therapists are also important, but they cannot understand the frustrations an amputee goes through unless they are an amputee.&#;
[33]
Most participants mentioned a fear of getting negative reactions in public, or having experienced this in the past [19,29,31,32,34,35,39,41]. One participant mentioned being torn between wanting people to know about the prosthesis and not wanting to tell them.
&#;Yeah, but I am always more comfortable if people know. I have been in so many situations for example in pubs where people might slap my leg and say Jesus what is that. So I would be more comfortable if people knew. At the same time I don&#;t go broadcasting it.&#;
[29]
Many participants expressed a desire to fit in with other groups and be the same as others [19,29,34,35,38,39,41]. They find it hard to accept that they stand out and want to belong and &#;be normal&#;, which often means wanting to be the same as persons without lower limb loss.
&#;I can ambulate quite effectively on it and I don&#;t feel so cut-off or left out of what everybody else is doing. And that&#;s really a big thing for me, because I felt like I didn&#;t belong or that I was substandard somehow as everyone moved about freely and around me. And that was difficult to accept, it was hard on me.&#;
[41]
Focus group
At first glance, the factor &#;advertisement&#; was not clear to all participants. Even after a further explanation, one of the participants still did not relate having any influence on his prosthesis use or satisfaction to this factor. Others mentioned that the information on the internet was often focussed on the more expensive prostheses.
&#;When you are looking for information, you only find the very expensive prostheses to which the health insurance companies say no.&#;
[P5]
Subsequently, the participants discussed the different reactions they get from others in public. The experiences varied from positive to negative experiences.
&#;I&#;m in shops more often now and often I have the mobility scooter with me, because I can&#;t walk a good distance yet. I notice that people find me very annoying, or I&#;m too slow, or you hear a sigh&#;I find it difficult.&#;
[P3]
Anonymity was a topic that was shortly discussed and the opinions varied. Whereas a few participants did not mind showing their prosthesis in public, others did not feel comfortable doing so and preferred not to be noticed.
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&#;Other people just walk around without any clothes on [covering the prosthesis] and have no problem with that; I don&#;t have that (or I don&#;t feel that way). The sound [of the prosthesis] was also annoying to me. Basically I just want to be unobtrusive.&#;
[P1]
Most participants also mentioned a variety of reactions they had received from friends and family, ranging from prejudice about their abilities to problems with acceptance. This could sometimes lead to unwanted help and frustrations. One participant mentioned that it sometimes felt like his family had a harder time accepting his amputation than he did. Since the participants felt that these experiences did not fit in any of the factors on the pre-final framework, the factor &#;reactions from friends/family&#; was added.
Wearing a prosthesis can have an effect on someone&#;s ability to perform specific roles, such as being a parent.
&#;When my daughter was born, I was like: you can&#;t walk around with this [prosthesis] anymore. You can&#;t hold a baby and risk collapsing. So then I got a C-leg and I am very happy with it.&#;
[P1]
It can also influence the way they interact with their loved ones.
&#;I feel like a different person when I&#;m wearing a prosthesis. It may sound a bit crazy, but I feel more complete when I am standing up. Life is so much more fun standing up. Being able to hug your husband or looking someone in the eyes.&#;
[P3]
Lastly, one participant noticed the absence of the factor &#;sexuality&#;. Other participants agreed that this was an important factor, but it was not discussed any further. Therefore, &#;sexuality&#; was added to the final framework.
Theme 4: Activities and participation
Factors included in this theme are related to a person&#;s personal tasks and activities, as well as their participation in society.
Meta-synthesis
Being able to participate in leisure activities, such as sports, are often mentioned as a positive influence on participants&#; life [29,31,32,34&#;36,38&#;40]. Furthermore, the use of a prosthesis can help with other aspects as well, like returning to school or work and self-care [29&#;32,34&#;36,38&#;40].
&#;Today I&#;m a new person! I returned to school and to work! I bodyboard! My life is not the same but it [amputation and prosthesis] is already a part of me! I adjusted my life to it, but I haven&#;t stopped doing my favourite hobbies or meeting my friends.&#;
[31]
Participants also discussed the fact that the use of a prosthesis can sometimes force them to prioritize certain activities over others, in order to preserve their energy or because of discomfort [32,34&#;36].
&#;First of all, you [do] less activities than you would normally because, say like you planned to go to the mall or you planned to go to the beach or something and you are having a bad day or in pain with your stump. Of course you wouldn&#;t do it that day and you would be a little grouchy, you know, because the pain is irritating and you would be less active in your normal day.&#;
[36]
Focus group
One of the participants mentioned that he felt that the rehabilitation team and prosthetist should pay more attention to leisure activities. Other participants agreed with this statement and spoke up about the desire to partake in sports. Some of them felt held back by the rehabilitation team, since they were told they could no longer do certain sports or would have to rely on a wheelchair to do so.
&#;What I miss very much about this is that, in practice, hobbies are not considered at all. In fact, I want to do a lot of sport, but in my case they said, yes, do that in a wheelchair. So I do indeed miss that, if you want to, you just don&#;t get the opportunity. That hobbies are looked at&#;I think as a luxury&#;
[P3]
Prioritizing activities was something all participants agreed on. Due to the use of the prosthesis, they had to make decisions about which activities they could or could not do. The main concern was running out of energy faster.
&#;If I choose to go for a walk, just to train myself, then that is a choice. I will put my energy into that and afterwards I need some time to recover.&#;
[P1]
Overall, most of the participants agreed that they shared the desire to be able to do things the way they used to before their amputation.
&#;I want to be able to do the things I would normally do [before amputation] with my prosthesis. I want to be able to walk a bit faster with my children and just do my daily things in a normal way.&#;
[P5]
Theme 5: Physical
This theme includes all factors that are related to the body of the prosthesis user.
Meta-synthesis
Participants had mixed opinions about the physical abilities and restrictions that are connected to prosthesis use. While some where happy to be able to walk and have some mobility, others highlighted some physical restrictions they experienced as limitations such as not being able to walk up the stairs or to run.
&#;My biggest problem was teaching my daughters about riding a bike and running alongside them for a long distance &#; I could run a few feet, but wasn&#;t running a block or anything like that.&#;
[36]
The occurrence of skin irritation was a problem for many prosthesis users [29,33&#;37]. One participant acknowledged some limitations, but opted not to focus on these:
&#;Yes, there are limitations, even though I choose not to focus on them. I don&#;t have the same endurance I once did. I can&#;t run as fast as I would with a real leg. Sometimes, I still get blisters, or lose my balance. But I look at it from the perspective that everybody has bad days. Everyone sits down and cries once in a while. And that&#;s okay.&#;
[35]
Focus group
One of the first things that was mentioned when this theme was discussed was the factor &#;gender&#;. At first it was not clear to all participants what this factor entailed, but two participants described gender-specific problems they experienced while using their prosthesis. For women this entailed having to cope with menstruation. For men the experience of getting one&#;s testicles stuck in the brim of their socket was discussed as a negative gender-specific problem.
The next topic that was discussed, was the sensibility of the stump. Scenario&#;s that normally would not hurt, suddenly felt excruciating. Since this topic did not fit any of the existing factors, &#;stump sensibility&#; was added.
&#;The other day when I was running the fan in the summer, it felt like my whole leg was on fire.&#;
[P5]
In addition to stump sensibility, skin irritation was discussed as an issue that can have an impact on the prosthesis use.
&#;I&#;ve been walking with a prosthesis for 40 years and since a few years I have had problems with my skin. It was never an issue, but now it is and it bothers me. I can no longer walk as much as I want.&#;
[P1]
Subsequently, the participants explained that the factor &#;phantom sensations&#; was missing from the overview, since this was very different from phantom pain. Therefore, &#;phantom sensations&#; was added to the final framework.
Theme 6: Mental
The factors in this theme are all related to the prosthesis user&#;s thoughts and feelings.
Meta-synthesis
Regaining independence after amputation and not having to rely on the help of others was an often recurring factor of interest [19,29&#;34,38,39]. One study mentioned that independence should not be observed solely as a functional outcome, since it also is related to psychological aspects.
One participant explained the effect of being dependent on others:
&#;I can&#;t accept this situation because it&#;s revolting being like this&#; without driving, walking, working&#; it&#;s very sad depending on others. &#;
[31]
Undergoing an amputation and becoming dependent on others can also have an impact on someone&#;s self-image.
Today I can&#;t do many things, I became more dependent on others, with less autonomy and I changed myself! Today I&#;m a more nervous and explosive person&#; I liked reading and today I don&#;t&#; many things changed for me.
[31]
The use of a prosthesis can have a positive effect on a person&#;s independence.
&#;Until I started using the prosthesis, I was more dependent on others&#; However I still need a lot of help.&#;
[31]
The last factor that was mentioned several times, was the importance of having a positive attitude [19,29&#;33,35,36].
&#;First, you must have a good attitude, otherwise, you won&#;t use the device. We should do the best with what we&#;ve got and have faith.&#;
[30]
For some it was hard to have a positive attitude, since they had a hard time coping with- and accepting their amputation and prosthesis use [29&#;35,37&#;39]. On the other hand, there were also participants who had accepted that even though they might no longer be able to do everything, they were at least going to try.
&#;If I was given a challenge I would try anything, I would never say no I can&#;t do that or I won&#;t do that. I would try it to the best of my ability, if I can do it I will do it, if I can&#;t, I can&#;t. I will try it and maybe I can&#;t go this far, it might be only to go that far but at least I will try it.&#;
[32]
Focus group
The factor &#;need for prosthesis&#; was discussed first and most participants agreed that while they technically could do without their prosthesis, they felt less comfortable if they did not wear it.
&#;Still, I think it&#;s an interesting point, because if I don&#;t put it on one day because it bothers me too much [stump sensibility], then I don&#;t like it. Then I think that, um, not only does it make it harder to move around the house, but it just bothers me. So yes, in that sense, I can&#;t do without them.&#;
[P1]
Finally, a participant mentioned that a number of emotions was already represented in the overview, but that he missed the factor &#;emotions&#;. Other participants agreed that this theme should include emotions.
&#;Sometimes I get extremely annoyed about my leg and that actually just makes it worse&#; (Angry emotions).&#;
[P8]
Theme 7: Walking
This theme consists of factors related to walking with a lower limb prosthesis.
Meta-synthesis
Fear of falling was the most often mentioned factor and a lot of participants mentioned that this fear influenced their daily life activities [19,29,30,34,36,39]. They were aware of the fact that if they did fall, it would have a large impact on their health and mobility. Participants also mentioned that they always have to focus on the surface they walk on, as this is more difficult when using a prosthesis [30,36,40].
&#;My first priority is always know where I&#;m stepping. [Amputees] tend to walk a little slower and damn straight. If we don&#;t, we find [we fall] more often than we like to claim.&#;
[36]
Focus group
Due to the focus group, four factors were added to the theme &#;Walking&#; in the final framework. One participant immediately noticed that walking distance was missing. Other participants agreed that it should be added. The next factor that was discussed was running and the need for a special sports prosthesis. One participant mentioned he ran on his regular prosthesis once.
A following factor was &#;steps&#;; the ability to go up or down small obstacles or stairs. The researcher asked whether this was the same as the walking surface, but participants said it was a different factor and it should be part of the final framework.
&#;To me, it is essential to be able to go up and down steps while walking.&#;
[P3]
Subsequently the participants discussed natural movements and walking confidence. Even though a few participants mentioned that a natural looking gait was important to them, one participant said walking confidence was more important to her.
&#;When you are confident when you walk, it doesn&#;t matter if you can walk very neatly or with a limp. As long as you feel good (about it).&#;
[P5]
Fear of falling was something that was an issue for a few of the participants. One of them expressed he constantly had to focus not to fall while walking.
&#;I would like for once to be able to walk without having to focus all the time; without a fear of falling.&#;
[P8]
The final factor that was added to this theme, was the (in-)ability to walk backwards.
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