Improved walking capacity after complementary ankle-foot surgery and gait training in a person with an incomplete tetraplegia; a case report.

INTRODUCTION: The population of people with a spinal cord injury (SCI) is changing to a diverse population with an increasing number of incomplete lesions. Often, these individuals have the capacity to walk, but experience disabling gait impairments. CASE PRESENTATION: The course of a 34-year-old male with a chronic incomplete traumatic cervical SCI who initially could walk no more than a few steps with supervision or a wheeled walker is described. He participated in a clinical trial with Targeted Epidural Spinal Stimulation (TESS). After this trial, he was able to walk with a wheeled walker and bilateral orthosis over a distance of 100 meters. Despite these improvements, his main complaints were (1) difficulty to correctly preposition the feet, and (2) pain in his toe and calf muscles. An interdisciplinary approach and the use of structured gait analysis formed the basis for shared decision-making with the team and the patient to perform ankle-foot surgery followed by 2-month gait training with a body weight support system. After this trajectory his walking distance increased to 250 meters, with a wheeled walker; but now without orthosis and with an increased walking speed compared to pre-surgery. Additionally, there was reduction of pain and he experienced no disturbances during sleeping, washing and clothing anymore. DISCUSSION: This case shows that surgical interventions can improve the gait capacity even in case of chronic incomplete SCI. Furthermore, training with a body weight support system after medical-technical interventions is useful to utilize the full potential of these interventions.

Improvement of quality of life after 2-month exoskeleton training in patients with chronic spinal cord injury.

OBJECTIVE: To examine changes in quality of life (QoL) after an eight-week period of robotic exoskeleton training in a homogeneous group of patients with chronic complete spinal cord injury (SCI). DESIGN: Prospective single-group pre-post study. SETTING: Rehabilitation center. PARTICIPANTS: Patients with a chronic (>6 months) motor complete SCI (T1-L1). INTERVENTION: Twenty-four training sessions with the ReWalk exoskeleton over an eight-week period. MAIN OUTCOME MEASURE: QoL, assessed with the sum score of the Short Form-36 with Walk Wheel modification (SF-36ww). Secondary outcome measures were the eight SF-36ww subdomains, satisfaction with bladder and bowel management, lower extremity joint passive range of motion (pROM), and lower extremity spasticity. RESULTS: Twenty-one participants completed the training. QoL significantly improved after the training period (average SF-36 sum score 621 ± 90) compared to baseline (571 ± 133) (t(20)=-2.5, P=.02). Improvements were seen on the SF-36ww subdomains for pain (P=.003), social functioning (P=.03), mental health (P=.02), and general health perception (P=.01). Satisfaction with bladder management (range 1-5) improved from median 3 at baseline to 4 after exoskeleton training (P=0.01). No changes in satisfaction with bowel management (P=.11), pROM (hip-extension (P=.49), knee-extension (P=.36), ankle dorsiflexion (P=.69)), or spasticity (P=.94) were found. CONCLUSION: Even in patients with chronic motor complete SCI and a relatively high level of QoL at baseline, a short-term exoskeleton training improved their QoL, pain and satisfaction with bladder management; findings that warrant further controlled studies in this specific SCI population.

Predictors of exoskeleton motor learning in spinal cord injured patients.

PURPOSE OF THE ARTICLE: Learning to use an exoskeleton is time consuming and diverse between users. Knowledge about trainability of exoskeleton skills is relevant for planning and expectation management. The objective was to assess predictors of exoskeleton skill performance during and after exoskeleton training. MATERIALS AND METHODS: Twenty-four participants with a motor complete spinal cord injury were given 24 training sessions in 8 weeks. Nine potential predictors were identified: lesion level, age, gender, age at injury, time since injury, BMI, sport, active lifestyle, and anxiety. Univariate and multivariate linear regression analyses were performed to examine predictors of skill performance after 2, 4, 6, and 8 weeks. RESULTS AND CONCLUSIONS: Twenty participants completed the training. Univariate analysis revealed that positive predictors were: low lesion level and more active lifestyle after 2 weeks, whereas low age at injury, low BMI, and more active lifestyle were positive predictors after 6 weeks. Multivariate regression model explained 65% of the performance after 2 weeks (predictors: lesion level, anxiety, active lifestyle) and 66% after 6 weeks (predictors: BMI, active lifestyle, age). Lesion level was a predictor during the first 4 weeks, but did not influence participants' final skill level. BMI, age, and active lifestyle were predictors toward the end of the training period.Implications for rehabilitationWith the help of wearable exoskeletons people with a complete spinal cord injury can regain their standing and walking mobility.Learning to use an exoskeleton is time consuming and the number of training sessions required to walk independently differs greatly between users.This study shows that lesion level was an important predictor of exoskeleton motor learning in the first 4 weeks of training.BMI, age, and active lifestyle were predictors of exoskeleton skill performance toward the end of the 8 week training period.

A Framework for Measuring the Progress in Exoskeleton Skills in People with Complete Spinal Cord Injury.

For safe application of exoskeletons in people with spinal cord injury at home or in the community, it is required to have completed an exoskeleton training in which users learn to perform basic and advanced skills. So far, a framework to test exoskeleton skills is lacking. The aim of this study was to develop and test the hierarchy and reliability of a framework for measuring the progress in the ability to perform basic and advanced skills. Twelve participants with paraplegia were given twenty-four training sessions in 8 weeks with the Rewalk-exoskeleton. During the 2nd, 4th, and 6th training week the Intermediate-skills-test was performed consisting of 27 skills, measured in an hierarchical order of difficulty, until two skills were not achieved. When participants could walk independently, the Final-skills-test, consisting of 20 skills, was performed in the last training session. Each skill was performed at least two times with a maximum of three attempts. As a reliability measure the consistency was used, which was the number of skills performed the same in the first two attempts relative to the total number. Ten participants completed the training program. Their number of achieved intermediate skills was significantly different between the measurements XF2(2) = 12.36, p = 0.001. Post-hoc analysis revealed a significant increase in the median achieved intermediate skills from 4 [1-7] at the first to 10.5 [5-26] at the third Intermediate-skills-test. The rate of participants who achieved the intermediate skills decreased and the coefficient of reproducibility was 0.98. Eight participants met the criteria to perform the Final-skills-test. Their median number of successfully performed final skills was 16.5 [13-20] and 17 [14-19] skills in the first and second time. The overall consistency of >70% was achieved in the Intermediate-skills-test (73%) and the Final-skills-test (81%). Eight out of twelve participants experienced skin damage during the training, in four participants this resulted in missed training sessions. The framework proposed in this study measured the progress in performing basic and advanced exoskeleton skills during a training program. The hierarchical ordered skills-test could discriminate across participants' skill-level and the overall consistency was considered acceptable.

Preserved foot motor cortex in patients with complete spinal cord injury: a functional near-infrared spectroscopic study.

BACKGROUND: Since the brain is intact, persons with a spinal cord injury (SCI) might benefit from a brain-computer interface (BCI) to improve mobility by making use of functional near-infrared spectroscopy (fNIRS). OBJECTIVE: We aimed to use fNIRS to detect contralateral primary motor cortex activity during attempted foot movements in participants with complete SCI. METHODS: A 6-channel fNIRS, including 2 reference channels, measured relative concentration changes of oxy- (HbO) and deoxy-hemoglobin (HbR) in the contralateral motor cortex for the right foot. Seven subjects, studied within 18 months after injury, performed 12 trials of attempted right foot and real hand movements. RESULTS: T tests revealed significant HbO and HbR responses of the left motor cortex for attempted foot movements, but not for right hand movements. A 2-way repeated-measures analysis of variance revealed a larger decrease in HbR for attempted foot movements compared to hand movements. Individual results show major interindividual differences in (number of) channels activated and the sensitive chromophore (HbR or HbO). CONCLUSIONS: On group level, activity in the motor cortex of the foot can be measured with fNIRS in patients with complete SCI during attempted foot movements and might in principle be used in future BCI studies and applications.

Arm movements can increase leg muscle activity during submaximal recumbent stepping in neurologically intact individuals.

Facilitation of leg muscle activity by active arm movements during locomotor tasks could be beneficial during gait rehabilitation after spinal cord injury. The present study explored the effects of arm movements on leg muscle activity during submaximal recumbent stepping. Healthy subjects exercised on a recumbent stepping machine both with and without arm movements. Activity of five leg muscles was recorded and compared for stepping with and without arm movements. To determine which arm movements are optimal for leg muscle facilitation, subjects were instructed to step with 1) mechanically coupled vs. decoupled arm and leg movements, 2) synchronous vs. asynchronous arm movements, and 3) at 50 vs. 70 RPM. Leg muscle activity was increased by active arm movements in all muscles, except the vastus lateralis muscle. Activity of other extensors (soleus, medial gastrocnemius, and biceps femoris) was primarily increased during the extension phase, whereas activity of flexors (tibialis anterior) was also increased during the flexion phase. Facilitation was more or less consistent for both frequencies and for synchronous and asynchronous movements. For coupled arm movements, facilitation tended to be diminished or absent. The observed facilitation in the present study is probably of neuromuscular rather than biomechanical origin, since the arms are probably hardly involved in postural control or weight-bearing during recumbent stepping. Further studies in patients should explore the possibility to integrate neuromuscular facilitation in rehabilitation programs.

Comparing content of therapy for people with a spinal cord injury in postacute inpatient rehabilitation in Australia, Norway, and The Netherlands.

BACKGROUND: Research reports have described the contents of therapy in spinal cord injury (SCI) rehabilitation only as the total number of therapy hours. We developed the Spinal Cord Injury-Interventions Classification System (SCI-ICS) as a tool to classify therapy to improve mobility and self-care into 3 levels (body functions, basic activities, and complex activities) and 25 categories. OBJECTIVE: The purposes of this study were: (1) to compare specific contents and amount of therapy provided, with the aim of improving mobility and self-care for people with SCI in Australia, Norway, and the Netherlands and (2) to evaluate the use of the SCI-ICS outside the Netherlands. DESIGN: This was a prospective, descriptive study. METHODS: Physical therapists, occupational therapists, and sports therapists in 6 centers recorded all therapy provided to all people with a recent SCI in inpatient rehabilitation during 4 designated weeks. Each treatment session was classified using 1 or more SCI-ICS codes. Duration of each intervention was specified. RESULTS: Seventy-three therapists recorded 2,526 treatments of 79 people with SCI (Netherlands, 48; Australia, 20; Norway, 11). Most therapy time was spent on exercises (overall mean=84%) and on categories at body function and basic activity level of the SCI-ICS. Therapy time significantly differed among countries for 13 of 25 categories. Mean time in minutes per treatment (Netherlands, 28; Australia, 43; Norway, 39) and in hours per patient per week (Netherlands, 4.3; Australia, 5.8; Norway, 6.2) differed significantly. LIMITATIONS: The short period and small number of patients may have influenced the results. CONCLUSIONS: Therapy in inpatient SCI rehabilitation in all 3 countries focused on mobility and self-care exercises at body function and basic activity level, but differences were present in focus on the various categories and therapy time. The SCI-ICS can be used reliably to describe therapy in different countries.

Contents of physical therapy, occupational therapy, and sports therapy sessions for patients with a spinal cord injury in three Dutch rehabilitation centres.

PURPOSE: To describe the contents of interventions to improve self-care and mobility for patients with spinal cord injury (SCI) in early post-acute rehabilitation, using the Spinal Cord Injury-Interventions Classification System (SCI-ICS), and to compare these interventions between rehabilitation centres. The SCI-ICS describes therapy to improve self-care and mobility at three levels of functioning and consists of 25 categories with a total of 139 different interventions. METHODS: Fifty-three physical therapists, occupational therapists and sports therapists of three Dutch SCI rehabilitation centres recorded interventions with the SCI-ICS for patients with SCI in early post-acute rehabilitation for four consecutive weeks. RESULTS: Therapists recorded 1640 treatment sessions of 48 patients with a SCI. The mean number of treatment sessions per patient per week (8.9 overall) differed between centres (p < 0.05), unlike the mean therapy time in minutes per patient per week (259 overall). Highest frequencies for individual categories were found for 'Muscle Power', 'Walking', and 'Hand rim wheelchair propulsion'. CONCLUSIONS: We described the specific contents of therapy of patients with a SCI in three Dutch rehabilitation centres. The largest proportion of time was spent on interventions to improve muscle power, walking, and hand rim wheelchair propulsion.

A five-week exercise program can reduce falls and improve obstacle avoidance in the elderly.

BACKGROUND: Falls in the elderly are a major health problem. Although exercise programs have been shown to reduce the risk of falls, the optimal exercise components, as well as the working mechanisms that underlie the effectiveness of these programs, have not yet been established. OBJECTIVE: To test whether the Nijmegen Falls Prevention Program was effective in reducing falls and improving standing balance, balance confidence, and obstacle avoidance performance in community-dwelling elderly people. METHODS: A total of 113 elderly with a history of falls participated in this study (exercise group, n = 79; control group, n = 28; dropouts before randomization, n = 6). Exercise sessions were held twice weekly for 5 weeks. Pre- and post-intervention fall monitoring and quantitative motor control assessments were performed. The outcome measures were the number of falls, standing balance and obstacle avoidance performance, and balance confidence scores. RESULTS: The number of falls in the exercise group decreased by 46% (incidence rate ratio (IRR) 0.54, 95% confidence interval (CI) 0.36-0.79) compared to the number of falls during the baseline period and by 46% (IRR 0.54, 95% CI 0.34-0.86) compared to the control group. Obstacle avoidance success rates improved significantly more in the exercise group (on average 12%) compared to the control group (on average 6%). Quiet stance and weight-shifting measures did not show significant effects of exercise. The exercise group also had a 6% increase of balance confidence scores. CONCLUSION: The Nijmegen Falls Prevention Program was effective in reducing the incidence of falls in otherwise healthy elderly. There was no evidence of improved control of posture as a mechanism underlying this result. In contrast, an obstacle avoidance task indicated that subjects improved their performance. Laboratory obstacle avoidance tests may therefore be better instruments to evaluate future fall prevention studies than posturographic balance assessments.