Eye typing is a hands-free method of human computer interaction, which is especially useful for people with upper limb disabilities. Users select a desired key by gazing at it in an image of a ...keyboard for a fixed dwell time. There is a tradeoff in selecting the dwell time; shorter dwell times lead to errors due to unintentional selections, while longer dwell times lead to a slow input speed. We propose to speed up eye typing while maintaining low error by dynamically adjusting the dwell time for each letter based on the past input history. More likely letters are assigned shorter dwell times. Our method is based on a probabilistic generative model of gaze, which enables us to assign dwell times using a principled model that requires only a few free parameters. We evaluate our model on both able-bodied subjects and subjects with a spinal cord injury (SCI). Compared to the standard dwell time method, we find consistent increases in typing speed in both cases. e.g., 41.8% faster typing for able-bodied subjects on a transcription task and 49.5% faster typing for SCI subjects in a chatbot task. We observed more inter-subject variability for SCI subjects.
While the pathological manifestation of atlantoaxial rotatory dislocation has been well described in the medical literature, the combined dislocation of the atlantoaxial and atlanto-occipital joints, ...or OAARD – short for occipital-atlantoaxial rotatory dislocation – is a condition which has been poorly elucidated and probably underdiagnosed. We believe that the pathogenesis of combined atlantoaxial and atlanto-occipital dislocation is most likely a result of untreated atlantoaxial rotatory dislocation leading to chronic secondary compensation measures occurring at the occiput-C1 joints. Unique clinical and radiological features lead to difficulty in diagnosis, and conventional treatment algorithms may not apply. This paper describes a combination of clinical and radiological features which can help clinicians correctly diagnose and treat OAARD.
In addition to helping individuals with spinal cord injury (SCI) regain the ability to ambulate, the rapidly evolving capabilities of robotic exoskeletons provide an array of secondary biophysical ...benefits which can reduce the complications resulting from prolonged immobilization. The proposed benefits of increased life-long over-ground walking capacity include improved upper body muscular fitness, improved circulatory response, improved bowel movement regularity, and reduced pain and spasticity. Beyond the positive changes related to physical and biological function, exoskeletons have been suggested to improve SCI individuals' quality of life (QOL) by allowing increased participation in day-to-day activities. Most of the currently available studies that have reported on the impact of exoskeletons on the QOL and prevention of secondary health complications on individuals with SCI, are of small scale and are heterogeneous in nature. Moreover, few meta-analyses and reviews have attempted to consolidate the dispersed data to reach more definitive conclusions of the effects of exoskeleton use. This scoping review seeks to provide an overview on the known effects of overground exoskeleton use, on the prevention of secondary health complications, changes to the QOL, and their effect on the independence of SCI individuals in the community settings. Moreover, the intent of the review is to identify gaps in the literature currently available, and to make recommendations on focus study areas and methods for future investigations.
Study Design
Literature Review (Narrative).
Objective
To introduce the number 10 research priority for Degenerative Cervical Myelopathy: Individualizing Surgery.
Methods
This article summarizes the ...current recommendations and indications for surgery, including how known prognostic factors such as injury time, age, disease severity, and associated comorbidities impact surgical outcome. It also considers key areas of uncertainty that should be the focus of future research.
Results
While a small proportion of conservatively managed patients may remain stable, the majority will deteriorate over time. To date, surgical decompression is the mainstay of treatment, able to halt disease progression and improve neurologic function and quality of life for most patients. Whilst this recognition has led to recommendations on when to offer surgery, there remain many uncertainties including the type of surgery, or timing in milder and/or asymptomatic cases. Their clarification has the potential to transform outcomes, by ensuring surgery offers each individual its maximum benefit.
Conclusion
Developing the evidence to better guide surgical decision-making at the individual patient level is a research priority for Degenerative Cervical Myelopathy.
Intrathecal baclofen pump associated central nervous system (CNS) infection and meningitis is a rare but serious complication and may have dire consequences. Due to bacterial biofilm formation, the ...optimal treatment strategy is usually for removal of the pump, followed by systemic antibiotics for treatment of local and CNS infection. We describe this case of a patient with recurrent Staphylococcus aureus pump site empyema and meningitis leading to status dystonicus, who was successfully managed with radical debridement and intrareservoir baclofen-vancomycin co-infusion.
We retrospectively report a case of infected intrathecal baclofen pump with meningitis and provide a full review of literature.
To the best of our knowledge, this is the first reported case of intrathecal baclofen (ITB)-associated pump site empyema and meningitis successfully treated with this technique. In selected cases where surgical explantation is deemed not feasible, this method can provide clinicians with an additional option for pump salvage and retention, while eradicating CNS infection and maintaining optimal control of spasticity and dystonia.
Background
Adolescent idiopathic scoliosis (AIS) refers to a three‐dimensional spinal deformity which has a typical onset during adolescence. In most cases, the cause of the deformity cannot be ...clearly identified. Unbalanced paraspinal muscle activity in AIS patients was reported and hypoxia was implicated to regulate myogenesis. This study aims to investigate the association between myogenesis/muscle toning and HIF‐αs activity in the pathogenesis of AIS.
Methods
HIF‐αs expression was examined by enzyme‐linked immunosorbent assay and western blot in paraspinal myoblasts isolated from 18 subjects who underwent deformity correction surgery. QPCR was conducted to measure the gene expression levels of perinatal muscle fiber markers MYH3, MYH8; slow twitch muscle fiber markers MHY7; fast twitch muscle fiber markers MYH4; and myogenic regulatory factors MYF5 and MYOG. Slow and fast twitch muscle fiber composition in concave/convex paraspinal musculature of AIS subjects was evaluated by immunostaining of myosin heavy chain type I (MyHC I) and myosin heavy chain type II (MyHC II).
Results
Reduced HIF‐2α induction under hypoxia was found in paraspinal myoblast culture of 33% AIS subjects. We detected a suppression of perinatal and slow twitch muscle fiber associated genes, but not fast twitch muscle fiber‐associated genes and myogenic regulatory factors in HIF‐2α misexpressed AIS myoblasts. Distinct reduction of slow twitch muscle fiber was evidenced in convex paraspinal musculature, suggesting an asymmetric expression of slow twitch muscle fiber in HIF‐2α misexpressed AIS patients.
Conclusions
This study indicates an association of abnormal HIF‐2α expression in paraspinal myoblasts and a disproportionate slow twitch muscle fiber content in the convexity of the curvature in a subset of AIS subjects, suggesting HIF‐2α dysregulation as a possible risk factor for AIS. The role of HIF‐2α in paraspinal muscle function during spinal growth and its relevance in AIS prognosis warrants further investigation.
This study indicates an association of abnormal HIF‐2α expression in paraspinal myoblasts and a disproportionate slow twitch muscle fiber content in the convexity of the curvature in a sub‐set of AIS subjects, suggesting HIF‐2α dysregulation as a possible risk factor for AIS. The role of HIF‐2α in paraspinal muscle function during spinal growth and its relevance in AIS prognosis warrants further investigation.
Study Design
Literature Review (Narrative)
Objective
To introduce the number one research priority for Degenerative Cervical Myelopathy (DCM): Raising Awareness.
Methods
Raising awareness has been ...recognized by AO Spine RECODE-DCM as the number one research priority. This article reviews the evidence that awareness is low, the potential drivers, and why this must be addressed. Case studies of success from other diseases are also reviewed, drawing potential parallels and opportunities for DCM.
Results
DCM may affect as many as 1 in 50 adults, yet few will receive a diagnosis and those that do will wait many years for it. This leads to poorer outcomes from surgery and greater disability. DCM is rarely featured in healthcare professional training programs and has received relatively little research funding (<2% of Amyotrophic Lateral Sclerosis or Multiple Sclerosis over the last 25 years). The transformation of stroke and acute coronary syndrome services, from a position of best supportive care with occasional surgery over 50 years ago, to avoidable disability today, represents transferable examples of success and potential opportunities for DCM. Central to this is raising awareness.
Conclusion
Despite the devastating burden on the patient, recognition across research, clinical practice, and healthcare policy are limited. DCM represents a significant unmet need that must become an international public health priority.
Study Design:
Narrative review.
Objectives:
To discuss the importance of establishing diagnostic criteria in Degenerative Cervical Myelopathy (DCM), including factors that must be taken into account ...and challenges that must be overcome in this process.
Methods:
Literature review summarising current evidence of establishing diagnostic criteria for DCM.
Results:
Degenerative Cervical Myelopathy (DCM) is characterised by a degenerative process of the cervical spine resulting in chronic spinal cord dysfunction and subsequent neurological disability. Diagnostic delays lead to progressive neurological decline with associated reduction in quality of life for patients. Surgical decompression may halt neurologic worsening and, in many cases, improves function. Therefore, making a prompt diagnosis of DCM in order to facilitate early surgical intervention is a clinical priority in DCM.
Conclusion:
There are often extensive delays in the diagnosis of DCM. Presently, no single set of diagnostic criteria exists for DCM, making it challenging for clinicians to make the diagnosis. Earlier diagnosis and subsequent specialist referral could lead to improved patient outcomes using existing treatment modalities.
Paediatric pelvic and hip radiographs are a common investigation used when assessing a child for suspected developmental dysplasia of the hip. This report describes an attempt to establish normal ...values of medial joint space, acetabular index and centre edge angle according to specific age groups and sex in a Chinese population. Patients who had undergone a pelvic radiograph as part of their assessment, but were subsequently found to have normal hips were recruited retrospectively. These patients were grouped according to sex and age; medial joint space, acetabular index and centre edge angle were measured in all radiographs. A mean±SD was calculated for each group, and then each age group was tested for statistical significance between the male and the female groups. A total of, 98 patients were recruited, who underwent 188 pelvic radiographs, resulting in images of 376 ‘normal’ hips. The results for medial joint space, acetabular index and centre edge angle for each age and sex group are described. Only the acetabular index requires different reference ranges for male and female patients because of consistent statistical significance between the two groups. It was found that medial joint space remained fairly constant throughout the age groups, whereas the acetabular index decreased and the centre edge angle increased slightly. The reference ranges for the parameters described here are quite different from those established previously in a population of Northern-European descent, which could be because of a variety of reasons including genetics, body habitus and measurement technique. We believe that it would be prudent to implement these different ranges when assessing patients of Chinese heritage to optimize care of patients who may suffer as a consequence of not receiving treatment for missed hip dysplasia. Level of EvidenceDiagnostic Study Level III – Study of nonconsecutive patients (without consistently applying the reference ‘gold’ standard).
To review and summarise current controversies in cervical screening in Hong Kong and discuss the potential impact of prophylactic human papillomavirus vaccination.
Literature search of Medline to ...December 2006, the Hong Kong Cancer Registry, and Centre of Disease Control.
Key words search terms were: 'human papillomavirus', 'vaccine', 'cervical cancer', 'screening programme', and 'Hong Kong'.
Original articles, review papers, books, and the worldwide web.
Cervical cancer is one of the most common cancers in Hong Kong, and can be prevented if detected at its pre-cancerous stage. Despite the huge disease burden this imposes on our society and robust advocacy by the academic sector, an appropriate screening programme is still not in place. Existence of a vaccine that could potentially reduce the costs of universal screening should prompt our government to re-consider subsidising such a programme. While a combined screening-vaccination programme may be more cost-effective than screening alone, the vaccine is still costly, and the government must consider all the pros and cons.
The new human papillomavirus vaccine, combined with an organised screening programme, is probably a more cost-effective way of preventing morbidity and mortality due to cervical cancer than the current programme in Hong Kong. More research and cost-effectiveness analyses are needed to decide on the ideal ages for primary vaccination and the requirement for booster shots.
PDF
