Cross slope gait biomechanics for individuals with and without a unilateral transtibial amputation.

BACKGROUND: This research was conducted to better understand compensatory strategies during cross-slope walking for adults with and without a unilateral transtibial amputation. METHODS: Fourteen individuals with unilateral transtibial amputation and 14 individuals with no lower limb amputation participated in this study. Motion and force data were captured while participants walked on a treadmill in a virtual reality environment for level and ± 5° cross slopes. Temporal-spatial parameters, kinematics (ankle, knee, hip, pelvis, trunk), and ground reaction forces were examined. FINDINGS: Compared to level, participants had similar step width but slightly longer steps for top-cross-slope and slightly shorter steps for bottom-cross-slope. Top-cross-slope required a more flexed limb with ankle eversion, and bottom-cross-slope required a more extended limb with ankle inversion. Participants had similar lateral pelvis and trunk motion for all walking conditions, but slightly more anterior trunk lean for top cross-slope with more anterior trunk lean observed for individuals with a lower limb amputation than without lower limb amputation. Participants with a lower limb amputation compensated for limited prosthetic ankle-foot dorsiflexion on the top-cross-slope by increasing prosthetic side hip flexion, reducing intact ankle/knee flexion, and increasing intact push-off force. INTERPRETATION: Gait adaptations during cross-slope walking were primarily in the lower extremities and were largely similar for those with and without a transtibial amputation. The information presented in this paper provides a better understanding of gait strategies adopted during cross-slope walking and can guide researchers and industry in prosthetic development.

Mitigating Long-Term COVID-19 Consequences on Brain Health.

COVID-19 is increasingly being linked to brain health impacts. The emerging situation is consistent with evidence of immunological injury to the brain, which has been described as a resulting "brain fog." The situation need not be medicalized but rather clinically managed in terms of improving resilience for an over-stressed nervous system. Pre-existing comparisons include managing post-concussion syndromes and/or brain fog. The objective evaluation of changes in cognitive functioning will be an important clinical starting point, which is being accelerated through pandemic digital health innovations. Pre-morbid brain health can significantly optimize risk factors and existing clinical frameworks provide useful guidance in managing over-stressed COVID-19 nervous systems.

Maintaining stable transtibial amputee gait on level and simulated uneven conditions in a virtual environment.

PURPOSE: This research compares gait strategies to maintain stable gait over a variety of non-level walking conditions for individuals with a transtibial amputation and able-bodied individuals. METHODS: Twelve people with unilateral transtibial amputation and twelve able-bodied individuals walked on a self-paced treadmill in a park-like virtual environment with level and continuous perturbation conditions. Walking stability was quantified by margin-of-stability, step parameters (walking speed, temporal and spatial parameters, and foot clearance), and gait variability (standard deviations for margin-of-stability, step parameters, and root-mean-square of trunk acceleration). RESULTS AND CONCLUSIONS: For non-level conditions, able-bodied and transtibial groups had greater root-mean-square of trunk acceleration and walked with a cautious and variable step strategy by changing speed, step width, foot clearance, margin-of-stability, and increasing step variability. Overall, able-bodied and transtibial amputee participants adopted similar strategies to maintain stable gait over non-level conditions, but the amputee group was more variable than the able-bodied group. These results demonstrated the importance of measuring gait variability, including trunk acceleration and step variability measures, when quantitatively assessing mobility for individuals with a transtibial amputation. Implications for rehabilitation Able-bodied and transtibial amputee groups adapted gait biomechanics for simulated uneven conditions. Adaptations for non-level conditions included increasing step width, margin-of stability, minimum foot clearance, and varying speed. Gait was also more variable for non-level conditions, with greater variability for transtibial amputee participants compared to able-bodied participants. These results highlight the importance of measuring variability when performing comprehensive walking assessment, particularly for active individuals who achieve maximal performance on standard assessments yet report functional limitations in daily living.

A Decade of mTBI Experience: What Have We Learned? A Summary of Proceedings From a NATO Lecture Series on Military mTBI.

Mild traumatic brain injury (mTBI, also known as a concussion) as a consequence of battlefield blast exposure or blunt force trauma has been of increasing concern to militaries during recent conflicts. This concern is due to the frequency of exposure to improvised explosive devices for forces engaged in operations both in Iraq and Afghanistan coupled with the recognition that mTBI may go unreported or undetected. Blasts can lead to mTBI through a variety of mechanisms. Debate continues as to whether exposure to a primary blast wave alone is sufficient to create brain injury in humans, and if so, exactly how this occurs with an intact skull. Resources dedicated to research in this area have also varied substantially among contributing NATO countries. Most of the research has been conducted in the US, focused on addressing uncertainties in management practices. Development of objective diagnostic tests should be a top priority to facilitate both diagnosis and prognosis, thereby improving management. It is expected that blast exposure and blunt force trauma to the head will continue to be a potential source of injury during future conflicts. An improved understanding of the effects of blast exposure will better enable military medical providers to manage mTBI cases and develop optimal protective measures. Without the immediate pressures that come with a high operational tempo, the time is right to look back at lessons learned, make full use of available data, and modify mitigation strategies with both available evidence and new evidence as it comes to light. Toward that end, leveraging our cooperation with the civilian medical community is critical because the military experience over the past 10 years has led to a renewed interest in many similar issues pertaining to mTBI in the civilian world. Such cross-fertilization of knowledge will undoubtedly benefit all. This paper highlights similarities and differences in approach to mTBI patient care in NATO and partner countries and provides a summary of and lessons learned from a NATO lecture series on the topic of mTBI, demonstrating utility of having patients present their experiences to a medical audience, linking practical clinical care to policy approaches.

Comparing the Efficiency of Software-Based Speech Recognition Versus Traditional Telephone Transcription in an Outpatient Physical Medicine and Rehabilitation Practice.

INTRODUCTION: Speech recognition (SR) uses computerized word recognition software that automatically transcribes spoken words to written text. Some studies indicate that SR may improve efficiency of electronic charting as well as associated cost and turnaround time1,2, but it remains unclear in the literature whether SR is superior to traditional transcription (TT). This study compared the impact of report generation efficiency of SR to TT at the Canadian Armed Forces Health Services Centre. MATERIALS AND METHODS: Dragon Medical Dictation™ SR software and traditional telephone dictation TT were used for two prespecified clinical days per week. In order to adjust for note length, total transcription efficacy was calculated as follows: word count/[dictation time + correction time]. The means and standard deviations were then separately calculated for TT visits and for SR visits. Differences in transcription efficacy and in visit measures, including patient demographics, visit duration, number of issues raised during the visit, and interventions performed, were compared using ANOVA, with the significance level set to 0.05. RESULTS: A total of 340 consecutive visits were analyzed; 198 were dictated over the phone using TT and 142 were transcribed using SR software. Dictation efficacy was significantly higher (p < 0.0001) for TT as compared to SR, while turnaround times were shorter for SR (0.12 versus 4.75 days). CONCLUSIONS: In light of these results, the Canadian Forces Health Services Centre in Ottawa has returned to use of TT because the relative inefficiency of report generation was deemed to have a greater impact on clinical care when compared to slower dictation turnaround time.

Out of the shadows: Chronic pain in Canadian Armed Forces veterans - Proceedings of a workshop at the 2019 Forum of the Canadian Institute for Military and Veteran Health Research.

This commentary summarizes proceedings of a workshop on chronic pain in military personnel and veterans (released personnel) at the Annual Forum of the Canadian Institute for Military and Veteran Health Research in Gatineau and Ottawa on October 22, 2019. The extent and impact of chronic pain among Canadian Armed Forces (CAF) veterans and their families is significant and has been underappreciated, largely due to limited disclosure by serving and veteran military personnel, stemming from a fear of stigmatization. Living with pain is seen as a fact of life in military cultures, something to be endured and not discussed. Though progress is being made in reducing the stigma of mental illness, the discourse on chronic pain remains censored. This workshop's goal was to bring the discussion of chronic pain out of the shadows in the search for ways to help veterans and active service personnel living with chronic pain. Many points of view were brought forward at this first national Canadian multidisciplinary gathering of researchers, veterans with lived experience, clinicians, and policymakers. A CAF member described his lived experience with constant chronic pain. Clinicians described aspects of chronic pain in military personnel and veterans whom they treat in their clinics. Dr. Ramesh Zacharias described the new Chronic Pain Center of Excellence for Canadian Veterans that will be established with funding from Veterans Affairs Canada. Dr. Norman Buckley highlighted collaboration with the existing Chronic Pain Network funded by the Canadian Institute for Health Research. Audience members identified a diverse variety of issues.

Ce commentaire résume les actes d'un atelier sur la douleur chronique chez le personnel militaire et les anciens combattants (personnel libéré) tenu dans le cadre du Forum annuel de l'Institut canadien de recherche sur la santé des militaires et des vétérans à Gatineau et Ottawa le 22 octobre 2019. L'étendue et l'effet de la douleur chronique chez les anciens combattants des Forces armées canadiennes (FAC) et leurs familles sont importantes et ont été sous-estimées, en grande partie en raison de la divulgation limitée par le personnel militaire en service et les anciens combattants, découlant de la peur de la stigmatisation. Le fait de vivre avec la douleur est considéré comme faisant partie de la vie dans les cultures militaires, quelque chose qu'il faut endurer et dont il ne faut pas discuter. Bien que des progrès aient été réalisés dans la réduction de la stigmatisation de la maladie mentale, le discours sur la douleur chronique continue d'être censuré. L'objectif de cet atelier était de faire sortir de l'ombre la discussion sur la douleur chronique afin de chercher des moyens d'aider les anciens combattants et le personnel de service actif vivant avec la douleur chronique. De nombreux points de vue ont été exprimés lors de cette première rencontre multidisciplinaire nationale canadienne réunissant des chercheurs, des anciens combattants ayant vécu l'expérience de la douleur chronique, des cliniciens et des décideurs. Un membre des FAC a décrit l'expérience de douleur chronique qu'il a vécue. Les cliniciens ont décrit les aspects de la douleur chronique chez le personnel militaire et les anciens combattants qu'ils traitent dans leurs cliniques. Le Dr Ramesh Zacharias a décrit le nouveau Centre d'excellence sur la douleur chronique pour les vétérans canadiens qui sera établi grâce au financement d'Anciens Combattants Canada. Le Dr Norman Buckley a souligné la collaboration avec le Réseau de douleur chronique existant financé par l'Institut canadien de la recherche en santé. Les membres de l'audience ont relevé divers problèmes.

Maintaining stable transfemoral amputee gait on level, sloped and simulated uneven conditions in a virtual environment.

PURPOSE: Describe and quantify how people with transfemoral amputations (TFA) maintain stable gait over a variety of surfaces; including, downhill and uphill, top and bottom-cross-slopes, medial-lateral translations, rolling hills and simulated rocky surfaces. METHODS: Ten TFA and ten matched people without amputations (NA) walked in a virtual environment with level, sloped and simulated uneven surfaces on a self-paced treadmill. Stability was quantified using medial-lateral margin of stability (ML-MoS), step parameters, and gait variability (standard deviations for speed, temporal-spatial parameters, foot clearance and root-mean-square of medial-lateral trunk acceleration). RESULTS AND CONCLUSIONS: TFA and NA adapted to non-level conditions by changing their walking speed, step width, and foot clearance. Variability for most parameters increased across conditions, compared to level. TFA walked slower than NA with shorter, wider and longer duration steps (most differences related to speed). ML-MoS did not change compared to level; however, ML-MoS was greater on the prosthetic side than both intact side and NA limbs. Foot clearance and root-mean-square of medial-lateral trunk acceleration were greater on the prosthetic side than the intact side and NA limbs. This research provides a comprehensive analysis of the different adaptations made by people without amputations compared to people with transfemoral amputations over non-level conditions and establishes significant differences between slopes and simulated uneven surfaces for TFA. Implications for Rehabilitation Transfemoral amputation and no amputation groups adapted walking biomechanics when traversing non-level surfaces. Greatest temporal-spatial gait adaptations were walking speed, step width and foot clearance. Gait parameter variability typically increased from the level condition in both groups. Transfemoral amputation group walked slower than no amputation group with shorter, wider steps and longer duration steps. This was related to speed. Transfemoral amputation group had more trunk motion variability on the prosthetic side than no amputation group; could be related to prosthetic fit.

Reflections on recovery, rehabilitation and reintegration of injured service members and veterans from a bio-psychosocial-spiritual perspective

Medical interventions regarding trauma resuscitation have increased survivorship to levels not previously attained. Multiple examples from recent conflicts illustrate the potential return to high-level function of severely injured service members following medical and rehabilitative interventions. This review addresses the goals of rehabilitation, distills hard-won lessons of the last decade of military trauma and rehabilitation, and recommends the use of a bio-psychosocial-spiritual approach to care that can be applied at all tiers of the health care system. Questions on enabling participation in meaningful life activities include the following: Why do some patients do well and others do not? What elements contribute to positive outcomes? What factors relate to suboptimal results? Lessons learned revolve around the importance of considering the physical, psychosocial and spiritual aspects of a person's well-being; empowering patients by fostering self-efficacy; and helping patients find meaning in life events and set high-level goals. A bio-psychosocial-spiritual model from the rehabilitation medicine literature ­ the Canadian Model of Occupational Performance and Engagement ­ is proposed as a guide to the provision of person-centred care and the maximization of a person's functioning posttrauma.

Les interventions médicales de réanimation en traumatologie ont porté les taux de survie à des niveaux encore inégalé. Plusieurs exemples tirés de conflits récents illustrent le retour potentiel à un degré fonctionnel élevé après des interventions médicales et de réadaptation chez des membres des forces armées grièvement blessés. La présente revue expose les objectifs de la réadaptation, résume les dures leçons tirées de la dernière décennie en traumatologie et réadaptation dans le monde militaire et recommande l'utilisation d'une approche de soins bio- et psychosociospirituelle qui peut être appliquée à tous les échelons du système de soins de santé. Les questions concernant la capacité d'un retour à des activités signifiantes incluent : Pourquoi les patients n'obtiennent-ils pas tous les mêmes résultats? Quels éléments contribuent à des résultats positifs? Quels facteurs sont en lien avec des résultats optimaux? Les leçons apprises font ressortir l'importance de tenir compte des dimensions physique, psychosociale et spirituelle des personnes pour assurer leur bien-être, de les rendre autonomes en favorisant une plus grande auto-efficacité et de les aider à trouver du sens dans les événements de la vie et à se fixer des objectifs ambitieux. Un modèle bio- et psychosociospirituel tiré de la littérature en médecine de réadaptation ­ le Modèle canadien de rendement occupationnel et de participation ­ est proposé comme guide pour la prestation de soins centrés sur la personne et la maximisation de son fonctionnement après un traumatisme.

Gait differences between K3 and K4 persons with transfemoral amputation across level and non-level walking conditions.

BACKGROUND:: A transfemoral amputee's functional level can be classified from K-level 0 (lowest) to K-level 4 (highest). Knowledge of the biomechanical differences between K3 and K4 transfemoral amputation could help inform clinical professionals and researchers in amputee care and gait assessment. OBJECTIVES:: Explore gait differences between K3- and K4-level transfemoral amputation across different surface conditions. STUDY DESIGN:: Cross-sectional study. METHODS:: Four K3 and six K4 transfemoral amputation and 10 matched able-bodied individuals walked in a virtual environment with simulated level and non-level surfaces on a self-paced treadmill. Stability measures included medial-lateral margin of stability, step parameters, and gait variability (standard deviations for speed, temporal-spatial parameters, root-mean-square of medial-lateral trunk acceleration). RESULTS:: K3 walked slower than K4 with wider steps, greater root-mean-square of medial-lateral trunk acceleration, and greater medial-lateral margin of stability standard deviations, indicating their stability was further challenged. K3 participants had greater asymmetry in double support time and trunk acceleration root-mean-square in the medial-lateral direction, but similar asymmetry overall. K3 participants had larger differences from AB and in more parameters than K4, although K4 differed from AB in trunk acceleration root-mean-square in the medial-lateral direction, walking speed, and double support time standard deviations. CONCLUSION:: The findings improve our understanding of K3 and K4 transfemoral amputation gait on slopes and simulated uneven surfaces. CLINICAL RELEVANCE: High performing and community ambulatory transfemoral amputees cannot match the ambulatory abilities of ablebodied individuals. Understanding gait differences between these groups under conditions that challenge balance is required to develop rehabilitation protocols and prosthetic componentry targeted at improving transfemoral amputee gait and overall mobility in their chosen environment.

Antibiotics in the treatment of patients with lower back pain associated with Modic changes: a case series.

PURPOSE: To determine the clinical effect of antibiotic treatment for patients with low back pain and Modic 1 changes. METHODS: This is a retrospective case series of patients treated at the Canadian Forces Health Services Centre in Ottawa and the McGill University Health Centre. Where available, pain, functional, and imaging outcomes in 11 patients treated between 2013 and 2015 were analyzed to determine effect of antibiotic treatment for patients with low back pain and associated Modic 1 changes on magnetic resonance imaging. RESULTS: Conservatively, only 3 of 11 patients met the criteria for improvement for pain and/or function. While a larger proportion improved in the long term, outcomes were not thought to be temporally attributable to antibiotic treatment, as in most cases, ongoing therapy, medications, and/or injections were required. There did not appear to be a correlation between clinical improvement and associated end plate volume involvement for Modic changes. CONCLUSION: Antibiotics for the treatment of low back pain in the context of Modic changes on MRI did not generally provide significant improvement in pain and function for patients in this small cohort. Despite early excitement regarding this treatment, further research is required.

Effectiveness of Service Dogs for Veterans with PTSD: Preliminary Outcomes.

Limited scientific evidence on the effectiveness of psychiatric service dogs used by Veterans with post-traumatic stress disorder (PTSD) is available. This study investigated their short-term effectiveness among 15 Canadian veterans who received a first psychiatric service dog. Preliminary results suggest potential beneficial effects at 3 months on the psychiatric symptoms.

A randomized comparison between neurostimulation and ultrasound-guided lateral femoral cutaneous nerve block.

BACKGROUND: This prospective, randomized trial compared neurostimulation (NS) and ultrasound (US) guided lateral femoral cutaneous nerve (LFCN) block. We hypothesized that US would result in a shorter total anesthesia-related time (sum of performance and onset times). METHODS: Twenty-one volunteers were enrolled. The right lower limb was randomized to an NS- or US-guided LFCN block. The alternate technique was employed for the left lower limb. With NS, paresthesias were sought in the lateral thigh at a stimulatory threshold of 0.6 mA (pulse width=0.3 ms; frequency=2 Hz) or lower. With US, local anesthetic was deposited under the inguinal ligament, ventral to the iliopsoas muscle. In both groups, 5 mL of lidocaine 2% were used to anesthetize the nerve. During the procedure of the block, the performance time and number of needle passes were recorded. Subsequently, a blinded observer assessed sensory block in the lateral thigh every minute until 20 minutes. Success was defined as loss of pinprick sensation at a point midway between the anterior superior iliac spine and the lateral knee line. The blinded observer also assessed the areas of sensory block in the anterior, medial, lateral, and posterior aspects of the thigh and mapped this distribution onto a corresponding grid. RESULTS: Both modalities provided comparable success rates (76.2%-95.2%), performance times (162.1 to 231.3 seconds), onset times (300.0 to 307.5 seconds) and total anesthesia related-times (480.1 to 554.0 seconds). However US required fewer needle passes (3.2±2.9 vs 9.5±12.2; P=.009). There were no intergroup differences in terms of the distribution of the anesthetized cutaneous areas. However considerable variability was encountered between individuals and between the 2 sides of a same subject. The most common areas of sensory loss included the central lateral two-eighths anteriorly and the central antero-inferior three-eighths laterally. CONCLUSION: Ultrasound guidance and NS provide similar success rates and total anesthesia-related times for LFCN block. The territory of the LFCN displays wide inter- and intra-individual variability.

Center of pressure and total force analyses for amputees walking with a backpack load over four surfaces.

Understanding how load carriage affects walking is important for people with a lower extremity amputation who may use different strategies to accommodate to the additional weight. Nine unilateral traumatic transtibial amputees (K4-level) walked over four surfaces (level-ground, uneven ground, incline, decline) with and without a 24.5 kg backpack. Center of pressure (COP) and total force were analyzed from F-Scan insole pressure sensor data. COP parameters were greater on the intact limb than on the prosthetic limb, which was likely a compensation for the loss of ankle control. Double support time (DST) was greater when walking with a backpack. Although longer DST is often considered a strategy to enhance stability and/or reduce loading forces, changes in DST were only moderately correlated with changes in peak force. High functioning transtibial amputees were able to accommodate to a standard backpack load and to maintain COP progression, even when walking over different surfaces.

Changes to transtibial amputee gait with a weighted backpack on multiple surfaces.

BACKGROUND: Modern prosthetic technology and rehabilitation practices have enabled people with lower extremity amputations to participate in almost all occupations and physical activities. Carrying backpack loads can be an essential component for many of these jobs and activities; however, amputee gait with backpack loads is poorly understood. This knowledge gap must be addressed in order to further improve an individual's quality of living through changes in rehabilitation programs and prosthesis development. METHODS: Ten male, unilateral, K4-level (ability or potential for prosthetic ambulation that exceeds basic ambulation skills, exhibiting high impact, stress, or energy levels), transtibial amputees completed ten walking trials at a self-selected pace on simulated uneven ground, ramp ascent, and ramp descent. Five trials were with a 24.5 kg backpack load and five trials without. Temporal-spatial parameters and kinematic peak values for the ankle, knee, hip, pelvis, and trunk were collected and analyzed for differences between backpack conditions. FINDINGS: Each surface had novel findings not found on the other surfaces. However differences in temporal-spatial parameters were congruent with the literature on able bodied individuals. Pelvis and trunk angular velocities decreased with the backpack. Hip flexion on both limbs increased during weight acceptance while wearing the backpack, a common adaptation seen in able-bodied individuals on level ground. INTERPRETATION: A 24.5 kg backpack load can be accommodated by transtibial amputees at the K4 functional level. Future studies on load carriage and gait training programs should include incline and descent due to the increased difficulty. Rehabilitation programs should verify hip and knee flexor strength and work to reduce intact limb reliance.

Diabetic Cranio-Cervico-Radiculoplexus Neuropathy.

We describe a case of a 53-year-old man with type 2 diabetes mellitus in whom cervical-radiculoplexus neuropathy developed, with concomitant cranial and phrenic nerve involvement, occurring as a stepwise, monophasic course. The patient had a presumed remote history of idiopathic cervical-radiculoplexus neuropathy.

Fixed and self-paced treadmill walking for able-bodied and transtibial amputees in a multi-terrain virtual environment.

A self-paced treadmill automatically adjusts speed in real-time to match the user's walking speed, potentially enabling more natural gait than fixed-speed treadmills. This research examined walking speed changes for able-bodied and transtibial amputee populations on a self-paced treadmill in a multi-terrain virtual environment and examined gait differences between fixed and self-paced treadmill speed conditions. Twelve able-bodied (AB) individuals and 12 individuals with unilateral transtibial amputation (TT) walked in a park-like virtual environment with level, slopes, and simulated uneven terrain scenarios. Temporal-spatial and range-of-motion parameters were analyzed. Within the self-paced condition, all participants significantly varied walking speed (p<0.001) across different walking activities. Compared to level walking, participants reduced speed for uphill and hilly activities (p<0.001). TT also reduced speed downhill (p<0.001). Generally, differences in temporal-spatial and range-of-motion parameters between fixed and self-paced speed conditions were no longer significantly different with a speed covariate. However, for uphill walking, both groups decreased stride length during self-paced trials, and increased stride length during fixed-speed trials to maintain the constant speed (p<0.01). The results from this study demonstrated self-paced treadmill mode is important for virtual reality systems with multiple movement scenarios in order to elicit more natural gait across various terrain. Fixed-speed treadmills may induce gait compensations to maintain the fixed speed.

Going places: Does the two-minute walk test predict the six-minute walk test in lower extremity amputees?

OBJECTIVE: Assessing a patient's ability to walk the distance required for community ambulation (at least 300 m) is important in amputee rehabilitation. During the 2-min walk test, most amputees cannot walk 300 m. Thus, the 6-min walk test may be preferred, but it has not been fully validated in this population. This study examined the convergent and discriminative validity of the 6-min walk test and assessed whether the 2-min test could predict the results of the 6-min test. METHODS: A total of 86 patients with unilateral or bilateral amputations at the Syme, transtibial, knee disarticulation or transfemoral level completed the 6-min walk test, 2-min walk test, Timed Up and Go test, Locomotor Capabilities Index version 5, Houghton Scale of Prosthetic Use, and Activity-Specific Balance Confidence scale. RESULTS: The 6-min walk test correlated with the other tests (R = 0.57-0.95), demonstrating convergent validity. It demonstrated discriminative validity with respect to age, aetiology of amputation, and K-level (p < 0.0001). The 2-min walk test was highly predictive of the 6-min walk test distance (R2 = 0.91). CONCLUSION: The 6-min walk test is a valid measure of amputee ambulation. However, the results suggest that it may not be necessary, since the 2-min walk test strongly predicts the 6-min walk test. Clinicians could therefore save time by using the shorter test.

Disability correlates in Canadian Armed Forces Regular Force Veterans.

PURPOSE: This study was undertaken to inform disability mitigation for military veterans by identifying personal, environmental, and health factors associated with activity limitations. METHOD: A sample of 3154 Canadian Armed Forces Regular Force Veterans who were released during 1998-2007 participated in the 2010 Survey on Transition to Civilian Life. Associations between personal and environmental factors, health conditions and activity limitations were explored using ordinal logistic regression. RESULTS: The prevalence of activity reduction in life domains was higher than the Canadian general population (49% versus 21%), as was needing assistance with at least one activity of daily living (17% versus 5%). Prior to adjusting for health conditions, disability odds were elevated for increased age, females, non-degree post-secondary graduation, low income, junior non-commissioned members, deployment, low social support, low mastery, high life stress, and weak sense of community belonging. Reduced odds were found for private/recruit ranks. Disability odds were highest for chronic pain (10.9), any mental health condition (2.7), and musculoskeletal conditions (2.6), and there was a synergistic additive effect of physical and mental health co-occurrence. CONCLUSIONS: Disability, measured as activity limitation, was associated with a range of personal and environmental factors and health conditions, indicating multifactorial and multidisciplinary approaches to disability mitigation.

Radiofrequency denervation of the hip joint for pain management: case report and literature review.

BACKGROUND: A 55-year-old male presented with severe pain and functional limitations as a result of left hip osteoarthritis. He had failed multiple treatments while waiting for a hip arthroplasty, including physical therapy, medications, and various intra-articular injections. Thermal radiofrequency lesioning of the obturator and femoral articular branches to the hip joint was offered in the interim. OBJECTIVES: To our knowledge, this is the first report to describe an inferior-lateral approach for lesioning the obturator branch, the clinical application of successive lesions to increase denervation area, and outcomes in a patient receiving a second treatment with previously good results. METHODS: To discuss relevant and technical factors for this specific case, we reviewed previous literature on hip joint radiofrequency and critically evaluated previous anatomic studies in the context of radiofrequency. RESULTS: The first treatment provided significant benefit for a period of 6 months. A second treatment was employed providing only mild to moderate benefit until his joint replacement surgery 4 months later. Literature review revealed studies of low quality secondary to small sample sizes, patient selection methodology, inclusion of patients with heterogenous etiologies for pain, variable needle placement techniques, and lack of measurement of functional outcomes. LIMITATIONS: Case report and low quality studies in existing literature. CONCLUSIONS: Hip joint radiofrequency denervation is a promising avenue for adjunctive treatment of hip pain. Further cadaveric studies are required to clarify a multitude of technical parameters. Once these are well defined, future clinical studies should consider pain, functional, and economic outcomes in their design.