Controlling a multi-degree of freedom upper limb prosthesis using foot controls: user experience

Abstract

Purpose: The DEKA Arm, a pre-commercial upper limb prosthesis, funded by the DARPA Revolutionizing Prosthetics Program, offers increased degrees of freedom while requiring a large number of user control inputs to operate. To address this challenge, DEKA developed prototype foot controls. Although the concept of utilizing foot controls to operate an upper limb prosthesis has been discussed for decades, only small-sized studies have been performed and no commercial product exists. The purpose of this paper is to report amputee user perspectives on using three different iterations of foot controls to operate the DEKA Arm. Method: Qualitative data was collected from 36 subjects as part of the Department of Veterans Affairs (VA) Study to Optimize the DEKA Arm through surveys, interviews, audio memos, and videotaped sessions. Three major, interrelated themes were identified using the constant comparative method: attitudes towards foot controls, psychomotor learning and physical experience of using foot controls. Results: Feedback about foot controls was generally positive for all iterations. The final version of foot controls was viewed most favorably. Conclusions: Our findings indicate that foot controls are a viable control option that can enable control of a multifunction upper limb prosthesis (the DEKA Arm).

• Implications for Rehabilitation

• Multifunction upper limb prostheses require many user control inputs to operate. Foot controls offer additional control input options for such advanced devices, yet have had minimal study.

• This study found that foot controls were a viable option for controlling multifunction upper limb prostheses. Most of the 36 subjects in this study were willing to adopt foot controls to control the multiple degrees of freedom of the DEKA Arm.

• With training and practice, all users were able to develop the psychomotor skills needed to successfully operate food controls. Some had initial difficulty, but acclimated over time.

     

Cognitive training on stroke patients via virtual reality-based serious games

Purpose: Use of virtual reality environments in cognitive rehabilitation offers cost benefits and other advantages. In order to test the effectiveness of a virtual reality application for neuropsychological rehabilitation, a cognitive training program using virtual reality was applied to stroke patients. Methods: A virtual reality-based serious games application for cognitive training was developed, with attention and memory tasks consisting of daily life activities. Twenty stroke patients were randomly assigned to two conditions: exposure to the intervention, and waiting list control. Results: The results showed significant improvements in attention and memory functions in the intervention group, but not in the controls. Conclusions: Overall findings provide further support for the use of VR cognitive training applications in neuropsychological rehabilitation.

• Implications for Rehabilitation

• Improvements in memory and attention functions following a virtual reality-based serious games intervention.

• Training of daily-life activities using a virtual reality application.

• Accessibility to training contents.

     

Prosthesis use in adult acquired major upper-limb amputees: patterns of wear,prosthetic skills and the actual use of prostheses in activities of daily life

Purpose: To describe patterns of prosthesis wear and perceived prosthetic usefulness in adult acquired upper-limb amputees (ULAs). To describe prosthetic skills in activities of daily life (ADL) and the actual use of prostheses in the performance of ADL tasks. To estimate the influence of prosthetic skills on actual prosthesis use and the influence of background factors on prosthetic skills and actual prosthesis use. Method: Cross-sectional study analysing population-based questionnaire data (n?=?224) and data from interviews and clinical testing in a referred/convenience sample of prosthesis-wearing ULAs (n?=?50). Effects were analysed using linear regression. Results: 80.8% wore prostheses. 90.3% reported their most worn prosthesis as useful. Prosthetic usefulness profiles varied with prosthetic type. Despite demonstrating good prosthetic skills, the amputees reported actual prosthesis use in only about half of the ADL tasks performed in everyday life. In unilateral amputees, increased actual use was associated with sufficient prosthetic training and with the use of myoelectric vs cosmetic prostheses, regardless of amputation level. Prosthetic skills did not affect actual prosthesis use. No background factors showed significant effect on prosthetic skills. Conclusions: Most major ULAs wear prostheses. Individualised prosthetic training and fitting of myoelectric rather than passive prostheses may increase actual prosthesis use in ADL.

Implications for Rehabilitation

• Arm prostheses are important functional aids for adult acquired major upper-limb amputees (ULAs).

• Despite being mainly satisfied with their prostheses, reporting their prostheses as useful and showing good prosthetic skills, prosthesis-wearing major ULAs do not use their prostheses for more than about half of the activities of daily life (ADL) tasks carried out in everyday life.

• In unilateral ULAs, individualised and targeted prosthetic training may increase optimal, active prosthesis use in ADL.

• Fitting the amputee with myoelectric rather than passive prostheses may increase prosthesis use in ADL, regardless of amputation level.

     

Feminine identity and functional benefits are key factors in women’s decision making about upper limb prostheses: a case series

Purpose: Although the DEKA Arm promises new abilities, it is unclear if women with upper limb amputation are willing to avail themselves of this new technology. The study purpose was to understand key factors and tradeoffs that shape women’s attitudes towards the DEKA Arm.

Methods: This case series includes three women with transradial amputation. Structured surveys and semi-guided interviews were administered after completion of in-laboratory training and a home trial of the DEKA Arm. A constant comparative method with a grounded theory approach was used to generate a model describing women’s decision-making related to the DEKA Arm. Quantitative data on prosthetic satisfaction was used to triangulate findings.

Results: Factors that enhanced desirability of the DEKA Arm were improved functionality, increased abilities and the availability of someone to service the prosthesis. Factors that detracted from desirability of the device were its appearance, conspicuousness, lifestyle incompatibility, weight, need for service and difficulty of use. Each woman weighted these factors within the larger context of the capabilities of and satisfaction with her personal prostheses, her self-concept and lifestyle needs. Situational demands, particularly the desire to appear feminine and professional or need to perform certain activities, also altered the valuation of these priorities.

Conclusion: Findings strongly suggest that advanced upper limb prosthetic technologies, like the DEKA Arm, will be better accepted by women if appropriately gendered in appearance and designed with women’s priorities in mind.

• Implications for Rehabilitation

• Women should be able to derive the functional benefits of advances in upper limb technology without needing to compromise their feminine identity and lifestyle preferences.

• Advanced upper limb prosthetic technologies will be better accepted by women if they are appropriately gendered.

     

Coping with cancer-related cognitive dysfunction: a scoping review of the literature

Purpose: Cancer-related cognitive dysfunction (CRCD) impacts memory, attention, concentration, language, multi-tasking, and organizational skills and decreases participation and quality of life for cancer survivors. The objectives of this article are: (1) to outline the neuroscience of CRCD, its risk factors, and its effect on participation; and (2) to identify and summarize the literature on rehabilitation interventions and coping techniques for CRCD in cancer survivors. Methods: A scoping review of articles cited in PubMed, MEDLINE, PsychINFO, and CINAHL was performed. To be included, articles must have been published in a peer-reviewed scientific journal between 1996 and 2014, written in English, and included a quantitative or qualitative non-pharmacological study of interventions and/or coping strategies for adult cancer survivors experiencing CRCD. Results: Ten articles met the inclusion criteria for final review. Six studies tested the efficacy of rehabilitation treatments on CRCD. Three involved cognitive–behavioral therapy (CBT), while three tested neuropsychological and/or cognitive training interventions. Four qualitative studies investigated coping strategies used by survivors with CRCD. Conclusions: CBT-based treatments and neuropsychological/cognitive training methods may ameliorate symptoms of CRCD. The most commonly-reported coping strategy is utilization of assistive technology and memory aids. Further research is needed about efficacious rehabilitation techniques for this population.

• Implications for Rehabilitation

• Cancer-related cognitive dysfunction (CRCD) may impact up to 50% of cancer survivors.

• CRCD can significantly decrease participation and quality of life during survivorship.

• Cognitive–behavioral therapy (CBT) and neuropsychological/cognitive training methods may ameliorate symptoms of CRCD.

• The most common coping strategy reported by cancer survivors with CRCD is the use of assistive technology and memory aids.

     

Prosthesis rejection in acquired major upper-limb amputees: a population-based survey

Purpose: To estimate the rates of primary and secondary prosthesis rejection in acquired major upper-limb amputees (ULAs), to describe the most frequently reported reasons for rejection and to estimate the influence of background factors on the risk of rejection. Method: Cross-sectional study analysing population-based questionnaire data (n?=?224). Effects were analysed by logistic regression analyses and Cox regression analyses. Results: Primary prosthesis rejection was found in 4.5% whereas 13.4% had discontinued prosthesis use. The main reasons reported for primary non-wear were a perceived lack of need and discrepancies between perceived need and the prostheses available. The main reasons reported for secondary prosthesis rejection were dissatisfaction with prosthetic comfort, function and control. Primary prosthesis rejection was more likely in ULAs amputated at high age and in ULAs with proximal amputations. Secondary prosthesis rejection was more likely in proximal ULAs and in women. Conclusions: Clinicians should be aware of the increased risk of rejection in proximal ULAs, elderly ULAs and in women. Emphasising individual needs will probably facilitate successful prosthetic fitting. Improved prosthesis quality and individualised prosthetic training may increase long-term prosthesis use. Further studies of the effect of prosthetic training and of the reasons for rejection of different prosthetic types are suggested.

Implications for Rehabilitation

• Most acquired major upper-limb amputees (ULAs) are fitted with prostheses after the amputation.

• This population-based study shows that proximal ULAs, elderly ULAs and women have an increased risk of prosthesis rejection.

• Emphasising individual needs may facilitate successful prosthetic fitting.

• Improved prosthesis quality and individualised prosthetic training may increase long-term prosthesis use.

     

Does English proficiency impact on health outcomes for inpatients undergoing stroke rehabilitation?

Purpose: To determine whether English proficiency and/or the frequency of interpreter use impacts on health outcomes for inpatient stroke rehabilitation. Method: Study design: Retrospective case–control study. Participants: People admitted for inpatient stroke rehabilitation. A high English proficiency group comprised people with native or near native English proficiency (n?=?80), and a low English proficiency group comprised people who preferred a language other than English (n?=?80). Outcome measures: Length of stay (LOS), discharge destination and Functional Independence Measure (FIM). Results: The low English proficiency group showed a greater improvement in FIM from admission to discharge (p?=?0.04). No significant differences were found between groups in LOS, discharge destination and number of encounters with allied health professionals. Increased interpreter usage improved FIM efficiency but did not significantly alter other outcomes. Conclusion: English proficiency does not appear to impact on health outcomes in inpatient rehabilitation with a primarily in-house professional interpreter service. However, there is a need for a larger powered study to confirm these findings.

• Implications for rehabilitation

• People with low English proficiency undergoing inpatient stroke rehabilitation in a setting with a primarily in-house professional interpreter service, achieved similar outcomes to those with high English proficiency irrespective of frequency of interpreter usage.

• A non-significant increase of 4 days length of stay was observed in the low English proficiency group compared to the high English proficiency group.

• For patients with low English proficiency, greater change in Functional Independence Measure efficiency scores was observed for those with higher levels of interpreter use relative to those with low interpreter use. Clinicians should optimise use of interpreters with patients with low English proficiency when possible.

     

Psychometric properties of the performing arts module of the Disabilities of the Arm,Shoulder, and Hand questionnaire

Abstract

Background: The Disabilities of the Arm, Shoulder, and Hand questionnaire (DASH) offers an optional performing arts module. The goal was to examine the psychometric properties of this module in musicians.

Methods: This study is a secondary analysis of a randomized controlled trial on the effectiveness of a biopsychosocial intervention to prevent or reduce playing-related disability in conservatory students. Baseline data were used to examine internal consistency and discriminative validity of the performing arts module of the DASH questionnaire. Construct validity was analyzed by hypotheses testing. The performing arts module outcomes were compared to scores from the general DASH questionnaire, pain disability index, Short-Form 36, playing-related musculoskeletal disorder (PRMD) intensity, and pain intensity.

Results: Questionnaires completed by 130 conservatory students were analyzed, 55% of the population was female. Median age was 20 years (IQR 4). The performing arts module showed good internal consistency (Cronbach’s alpha 0.893). Discriminative validity between students with and without PRMDs was good. Three out of six hypotheses were accepted, indicating moderate construct validity.

Conclusions: The performing arts module showed good internal consistency, good discriminative validity and moderate construct validity in a population of conservatory students.

• Implications for Rehabilitation

• Musicians suffer frequently from musculoskeletal disorders, mostly in the upper extremity.

• The Disabilities of the Arm, Shoulder, and Hand questionnaire is a well-known outcome measure, which also includes a performing arts module.

• This study is the first to explore psychometric properties of the performing arts module.

• The performing arts module of the Disabilities of the Arm, Shoulder, and Hand questionnaire showed good internal consistency, good discriminative validity, and moderate construct validity.

     

Everyday-like memory and its cognitive correlates in healthy older adults and in young patients with traumatic brain injury: a pilot study based on virtual reality

Abstract

Purpose State: A pilot-study with a comparison approach between aging and traumatic brain injury (TBI) is proposed to investigate everyday object memory patterns using a virtual HOMES test. Methods: Sixteen young controls, 15 older adults and 15 TBI patients underwent the HOMES test and traditional tests. Results: Older adults and TBI patients exhibited similar HOMES performances: poor recall, a greater recognition benefit, high false recognitions, but intact clustering and proactive interference effects. The age-related differences for HOMES measures were mainly mediated by executive functioning, while the HOMES performances in the TBI group were correlated with memory measures. Conclusion: The differential cognitive mediating effects for a similar everyday-like memory pattern are discussed by highlighting the need for more cautious interpretations of cognitive mechanisms behind similar behavioral patterns in different populations especially in clinical and rehabilitation settings.

• Implication for Rehabilitation

• Virtual reality might provide ecological scenarios to assess the multiple processes of everyday memory in elderly people as well as in TBI patients.

• A similar pattern of Everyday-like memory failures might result from different cognitive origins among different neuropsychological patients.

• The assessment of specific cognitive origins of Everyday-like memory impairments deserves consideration for drawing up relevant rehabilitative programs that match the specific cognitive needs of patients for performing everyday memory tasks.

     

Safety and function of a prototype microprocessor-controlled knee prosthesis for low active transfemoral amputees switching from a mechanic knee prosthesis: a pilot study

Purpose: Aim of this pilot study was to assess safety and functioning of a microprocessor-controlled knee prosthesis (MPK) after a short familiarization time and no structured physical therapy.

Materials and methods: Five elderly, low-active transfemoral amputees who were fitted with a standard non-microprocessor controlled knee prosthesis (NMPK) performed a baseline measurement consisting of a 3?D gait analysis, functional tests and questionnaires. The first follow-up consisted of the same test procedure and was performed with the MPK after 4 to 6?weeks of familiarization. After being refitted to their standard NMPK again, the subjects undertook the second follow-up which consisted of solely questionnaires 4?weeks later.

Results: Questionnaires and functional tests showed an increase in the perception of safety. Moreover, gait analysis revealed more physiologic knee and hip extension/flexion patterns when using the MPK.

Conclusion: Our results showed that although the Genium with Cenior-Leg ruleset-MPK (GCL-MPK) might help to improve several safety-related outcomes as well as gait biomechanics the functional potential of the GCL-MPK may have been limited without specific training and a sufficient acclimation period.

• Implications for Rehabilitation

• Elderly transfemoral amputees are often limited in their activity by safety issues as well as insufficient functioning regarding the non microprocessor-controlled knee prostheses (NMPK), thing that could be eliminated with the use of suitable microprocessor-controlled prostheses (MPK).

• The safety and functioning of a prototype MPK (GCL-MPK) specifically designed for the needs of older and low-active transfemoral amputees was assessed in this pilot study.

• The GCL-MPK showed indicators of increased safety and more natural walking patterns in older and low-active transfemoral amputees in comparison to the standard NMPK already after a short acclimatisation time and no structured physical therapy.

• Regarding functional performance it seems as if providing older and low-active transfemoral amputees with the GCL-MPK alone without prescribing structured prosthesis training might be insufficient to achieve improvements over the standard NMPKs.

     

The Wheelchair Use Confidence Scale: Italian translation,adaptation, and validation of the short form

Objective: We developed an Italian version of the Wheelchair Use Confidence Scale for Manual Users-Short Form (WheelCon-M-I-short form) and examined its reliability and validity.

Methods: The original scale was translated from English to Italian using the “Translation and Cultural Adaptation of Patient Reported Outcomes Measures–Principles of Good Practice” guidelines. The WheelCon-M-I-short form was administered to experienced manual wheelchair users who had a variety of diagnoses. Its internal consistency and test–retest reliability were examined. Its concurrent validity was evaluated using Pearson correlation coefficients with the Italian version of the Wheelchair Outcome Measure (WhOM-I) and the Italian version of the Barthel index (BI).

Results: The WheelCon-M-I-short form was administered to 31 subjects. The mean?±?SD of the WheelCon-M-I-short form score was 7.5?±?1.9. All WheelCon-M-I-short form items were either identical or similar in meaning to the WheelCon-M-short form items. Cronbach’s α for the WheelCon-M-I-short form was 0.95 (p?p?p?p?Conclusions: The WheelCon-M-I-short form was found to be reliable and a valid outcome measure for assessing manual wheelchair confidence in the Italian population.

• Implication for Rehabilitation

• The WheelCon-M-I-short form is a valid outcome measure available for assessing wheelchair confidence, according to Bandura’s social cognitive theory, self-efficacy is a better predictor of future behavior than skill itself.

• Translation of the WheelCon-M-short form into the WheelCon-M-I-short form provides a new tool for Italian professionals.

• Clinicians now have a method to measure this invisible barrier to wheelchair use, and they will be able to make informed decisions when prescribing the use of manual wheelchairs and when training clients in their use.

• The WheelCon-M-I-short form also provides researchers with a tool in an important and relevant area of study for future research.

     

Go baby go café: a case study on an immersive rehabilitation environment to improve functional outcomes and quality of life

Purpose: To determine the effectiveness of involving traumatic brain injury survivors in a novel “enriched rehabilitation environment” in which physical, cognitive, social and speech impairments are simultaneously addressed during training within a functioning business.

Method: Participant was a 34-year old with a history of a severe head injury 17?years ago due to a motor vehicle accident. A novel intervention was provided within the Go Baby Go Café at the University of Delaware during her two hour shifts, three times a week for 2?months.

Results: The participant showed improvement in hand function, dynamic mobility, gait speed and cognitive ability. Additionally, changes were also noted across different domains like social activities, feeling of well-being, gross motor function and quality of life.

Conclusions: The Café may be a viable environment for comprehensive intervention. Participation in the Café was associated with wide spread gains in scores on a variety of physical, cognitive, quality-of-life outcomes.

• Implications for rehabilitation

• Long-term impairments after traumatic brain injury often impairs activities of daily living, community integration and return to work.

• The Go Baby Go Café, installed with an overhead harness system serves as an “Immersive Environment” to address various impairments all at once in a real-world setting.

• Individuals with impairments can benefit from this rehabilitation technique, which is structured to improve changes across the International Classification of Functioning Disability and Health spectrum.

     

Explaining daily functioning in young adults with obstetric brachial plexus lesion

Abstract

Purpose: To study the influence of obstetric brachial plexus lesion (OBPL) on arm–hand function and daily functioning in adults, and to investigate the relationship of arm-hand function and pain to daily functioning. Method: Adults with unilateral OBPL who consulted the brachial plexus team at the VU University Medical Center in the past were invited to participate. Daily functioning was measured with the Disability of the Arm, Shoulder and Hand (DASH) questionnaire and the SF36, pain with VAS Pain Scales and arm-hand function with the Nine Hole Peg Test (9-HP-test) and the Action Research Arm Test (ARAT). Scores of the affected arm were compared to those of the non-affected arm or norm values for healthy controls. Results: Twenty-seven persons (mean age 22, SD 4.2 years), of whom 10 men, participated. The ARAT and 9-HP-test scores for the affected arm were significantly worse than those for the non-affected arm. Moderate to severe pain in the affected arm, the non-affected arm or the back was reported by 50% of the participants. The DASH general, sports/music and SF36 physical functioning scores were significantly worse than norm values. The ARAT/9-HP-test and daily functioning showed little association. Low to moderate associations were found between pain and daily functioning. Conclusions: Many young adults with OBPL experience limitations in daily functioning. Pain, rather than arm-hand function, seems to explain these limitations.

• Implications for Rehabilitation

• Obstetric brachial plexus lesion (OBPL) is caused by traction to the brachial plexus during labour, resulting in denervation of the muscles of the arm and shoulder girdle.

• Adults with OBPL are hardly seen in rehabilitation medicine.

• This study shows that many young adults with OBPL experience limitations in daily functioning. Pain, rather than arm-hand function, seems to explain these limitations.

• Fifty percent of the participants complained about moderate or severe pain, which was located in the affected arm, the back and the non-affected arm. There seems an age-related increase in pain prevalence.

• Persons who had undergone plexus surgery had a significantly worse arm-hand function, but comparable scores on daily functioning scales compared to persons without plexus surgery.

• When limitations in daily functioning or pain occur, referral to a rehabilitation physician is indicated.

     

Measurement properties of the Arm Function in Multiple Sclerosis Questionnaire (AMSQ): a study based on Classical Test Theory

Purpose: The construct validity, test–retest reliability, and measurement error of the Arm Function in Multiple Sclerosis Questionnaire (AMSQ) were examined. Additionally, the influence of administration-method on reliability and measurement error was investigated.

Method: 112 Dutch adult MS-patients from an academic- and a residential care-facility participated. Questionnaires were administered on paper, online or as interview, and patients performed several performance tests. Construct validity was assessed by testing pre-defined hypotheses. Reliability was assessed using Intraclass Correlation Coefficients (ICCs), Standard Error of Measurements (SEMs) and Smallest Detectable Changes (SDCs).

Results: For construct validity (N?=?105) 9 of 13 hypotheses were confirmed (69%). As expected, the AMSQ showed moderate to strong relationships with the instruments measuring similar constructs. The test–retest reliability coefficient was 0.96 (95% Confidence Interval 0.94–0.97); SEM was 6.3 (6.3% of scale range); SDC was 17.5 (on a sale from 0 to 100). Different administration-methods showed good reliability (ICC 0.88–0.94) and small standard errors (SEM 5.6–7.2).

Conclusion: The AMSQ shows satisfying results for validity and excellent reliability; allowing for proper use in research. Due to a large SDC value, caution is needed when using the AMSQ in individual patient care. Further research should determine whether the SDC is smaller than the minimal important change.

• Implications for Rehabilitation

• The Arm Function in Multiple Sclerosis Questionnaire (AMSQ) measures activity limitations due to hand and arm functioning in patients with Multiple Sclerosis (MS).

• Results of this study confirm adequate validity and reliability of the AMSQ in patient with MS.

• The equivalence of scores from online, paper or interview administration is supported.

• A change score of ≥18 points on the scale of the AMSQ (on a scale 0–100) needs to occur to be certain a change beyond measurement error has occurred in an individual patient.

     

Cognitive functioning in persons with lower limb amputations: a review

Purpose: To review the literature on cognitive functioning in persons with lower limb amputations. Method: A search of the MEDLINE, PsycINFO and Web of Science databases was carried out. Results: Thirty papers were found that met the inclusion criteria. The studies were characterised by heterogeneity of design, methodological quality, sample characteristics, assessment of cognitive functioning, and outcomes examined. The research published to date suggests that cognitive impairment is more prevalent among persons with lower limb amputations than in the general population, and is linked with a number of important outcomes in this patient group, including mobility, prosthesis use, and maintenance of independence following amputation. Conclusions: These findings highlight the importance of assessing the cognitive abilities of persons with lower limb amputations. An understanding of the cognitive profile of these patients could assist rehabilitation teams in determining their suitability for prosthetic or wheelchair rehabilitation, ascertaining appropriate and realistic goals for rehabilitation, and tailoring rehabilitation programmes to patients’ strengths so that maximal mobility and independence is achieved.

Implications for Rehabilitation

• Cognitive impairment appears to be more prevalent among persons with lower limb amputations than in the general population.

• Cognitive impairment is negatively associated with mobility, prosthesis use, and maintenance of independence following amputation.

• Cognitive screening prior to rehabilitation could assist in determining patients’ suitability for prosthetic or wheelchair use, ascertaining appropriate goals, and tailoring rehabilitation to patients’ strengths so as to optimise their mobility and independence.