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BACKGROUND:Three-point mechanics is an effective method for ankle foot orthosis correction and prevention of various foot diseases.At present,the clinical application research on 3D printing ankle foot orthosis has been widespread;however,there are relatively few reports on numerical simulation and finite element analysis involving three-point mechanical correction.There is a lack of relevant biomechanical experimental verification. OBJECTIVE:Three-point force was loaded to analyze the composite model of ankle foot orthosis and foot by finite element method,observing the effect of foot correction with ankle foot orthosis under three-point force intervention,verifying the effectiveness of three-point force and the reliability of ankle foot orthosis. METHODS:A three-dimensional foot and ankle model of a healthy volunteer was constructed based on the medical image processing software Mimics.Rodin 4D and Geomagic reverse engineering software were used to optimize the models and design personalized ankle foot orthosis models.Solidworks software was utilized to turn the ankle model inside for 10° to simulate the foot varus disease.Static loading was carried out on the foot force application area by ANSYS software combined with the three-point mechanics principle.The deformation and stress changes of the foot and ankle tissues were analyzed when the human foot pain threshold was met.The display dynamics was used to further verify the effectiveness of the three-point force applied by the ankle foot orthosis. RESULTS AND CONCLUSION:(1)The personalized ankle foot orthosis designed in this paper had the effect of preventing and fixing foot and ankle varus.The ankle varus was 1.81 mm after being loaded with 1 N·m of varus when not wearing ankle foot orthosis,while it was only 0.44 mm after wearing ankle foot orthosis,the deformation rate was reduced by 75.7%,and the effect of preventing varus was significantly enhanced.(2)When only coronal correction was performed,the low calcaneal force would aggravate the varus angle of the front foot.After adjusting the correction force on the inside of the heel and above the medial malleolus,the varus angle of the front foot and the calcaneus position were improved;however,the medial phalangeal region of the foot still had different degrees of adduction and displacement,which would aggravate the adduction deformity of the patient's front foot.(3)The correction effect of the coronal plane and horizontal plane was better than that of the single coronal plane.There was no adduction and displacement of the medial phalanges of the front foot and the varus angle of the front foot decreased under the force(25,10,10,20 N)of the medial heel,the medial shaft of the first metatarsal,below the lateral malleolus and above the medial malleolus,and the valgus along the X-axis was corrected by 1.395 mm,the calcaneus valgus was corrected by 1.227 mm.The calcaneus varus angle was corrected from 10.21° to 7.25°,and the varus angle was improved by 28.9%.(4)The lateral plantar metatarsal load decreased,the medial plantar metatarsal load increased under the action of a two-plane three-point force,and the plantar bone stress was significantly improved after correction.Thus,the reliability of the three-point force principle was further verified.This study provides an important theoretical support for the implementation of ankle foot orthosis in the treatment of varus in clinical practice.
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BACKGROUND:Orthosis is a common and effective treatment for mild to moderate scoliosis,which can delay and inhibit the progression of scoliosis and reduce the incidence of severe deformity.Different types of orthoses have different indications,application characteristics,and efficacies.In recent years,the application of new technology like digital and intelligent has promoted the improvement and development of new orthoses. OBJECTIVE:To classify and compare the commonly used scoliosis orthoses,and describe the application progress of new technologies such as digital and intelligent technology in recent years,so as to provide a reference for the clinical selection of orthoses and the improvement of new orthoses. METHODS:PubMed,Embase,IEEE,CNKI and WanFang databases were searched for relevant literature.Chinese and English search terms were"scoliosis,orthosis,brace,progress,artificial intelligence,digitization".The search time limit was from 2012 to 2022.Finally,56 articles were included for review and analysis. RESULTS AND CONCLUSION:(1)Scoliosis orthosis has a good effect on mild to moderate adolescent idiopathic scoliosis.Through the Hueter-Volkmann law,it can accelerate the growth of the concave spine with a high success rate and has been widely used in this field.(2)The indications,application characteristics and efficacy of different types of orthoses are different,and the clinical selection is targeted.(3)Scoliosis orthosis has been developed in the direction of more humanity,paying attention to the comfort of patients,and the manufacturing process has been transformed from plaster casting to computer-aided manufacturing.It is simple and hygienic,with higher correction accuracy,and patients'compliance has been significantly improved.(4)Scoliosis orthosis is developing in the direction of digitalization and intelligence and has been widely integrated with artificial intelligence,Internet of things and other technologies to monitor the patient's orthopedic force,body temperature,and compliance in real time,so as to provide patients with more accurate treatment.(5)At present,there are still many defects in scoliosis orthosis that cannot be ignored,such as affecting development,decreased muscle strength,and body stiffness,which need further exploration and improvement.
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BACKGROUND:Traditional scoliosis orthosis has some disadvantages,such as complex manufacturing process,long processing cycle,poor fit and so on.Three-dimensional printed scoliosis orthosis has the advantages of high manufacturing precision and personalization. OBJECTIVE:To evaluate the efficacy of three-dimensional printed scoliosis orthosis for scoliosis based on multi-criteria decision model. METHODS:Clinical data of 72 patients with scoliosis admitted to Chen Xinghai Hospital of Integrated Traditional Chinese and Western Medicine from January 2019 to October 2022 were retrospectively collected and divided into two groups according to the treatment of orthosis.Study group(n=23)received three-dimensional printed scoliosis orthosis.Traditional group(n=49)received the traditional polypropylene spine brace treatment.The clinical efficacy and complications were compared between the two groups.A multi-criteria decision model for the treatment of scoliosis with three-dimensional printed scoliosis orthosis was established,and the stability of the benefit value,risk value and decision model of the two groups were evaluated. RESULTS AND CONCLUSION:(1)Compared with the traditional group,there were significant differences in the top vertebral offset distance,Cobb angle,top vertebral rotation,Functional Movement Screen score,visual analog scale score and total effective rate in the study group at 6 months after surgery(P<0.05).(2)Among the benefit indexes,Cobb angle had the greatest impact on the condition of patients,while the risk indexes had the greatest impact on dyspnea.(3)The benefit values of the study group and the traditional group for scoliosis were 79 and 64,and the risk values were 74 and 57,respectively.The combined benefit and risk values found that the benefit-risk value of the study group was 16 higher than that of the traditional group.(4)In the range of 0-100%relative risk weight,the benefit-risk value of the study group was always higher than that of the traditional group,which proved that the multi-criteria decision-making model had good stability.(5)It is indicated that three-dimensional printed scoliosis orthosis can better restore the physiological curvature of scoliosis and improve the efficiency of treatment.
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BACKGROUND:The displacement change parameters of the bone structure of the first metatarsal bone at the two-dimensional level of hallux valgus deformity are of great significance for clinical diagnosis and treatment,while the quantitative analysis of the three-dimensional deformity index may have some influences on the postoperative efficacy. OBJECTIVE:To explore the quantitative change of the three-dimensional deformity index of the first metatarsal bone after routine osteotomy and orthosis for hallux valgus deformity and to provide reference for clinical work. METHODS:100 patients with hallux valgus deformity(foot)in Hengshui People's Hospital from October 2020 to April 2023 were selected and all of them underwent conventional osteotomy and orthosis.Foot function was assessed by the American Orthopedic Foot and Ankle Society Ankle-Hindfoot Scale 6 months after surgery.Anterolateral X-rays of the foot in weight-bearing position and CT images in simulated weight-bearing position were taken before surgery and 6 months after surgery.The three-dimensional deformity indexes of the first metatarsal bone before and after surgery were quantitatively analyzed in patients with different ages,genders and therapeutic effects,including first-second intermetatarsal angle,hallux valgus angle,distal metatarsal articular angle,tibial sesamaid position,and first metatarsal rotation α angle.The value of the difference of three-dimensional deformity indexes of the first metatarsal bone before and after operation in evaluating the curative effect was analyzed. RESULTS AND CONCLUSION:(1)Six months after operation,the American Orthopedic Foot and Ankle Society score was 75-98(88.25±4.14)points,among which 56 cases were excellent,28 cases were good,14 cases were average,and 2 cases were poor.The excellent and good rate was 84%(84/100).(2)Compared with the preoperative results,first-second intermetatarsal angle,hallux valgus angle,distal metatarsal articular angle,tibial sesamaid position,and first metatarsal rotation α angle were significantly improved in patients of different ages and genders 6 months after surgery(P<0.05).First-second intermetatarsal angle,hallux valgus angle,distal metatarsal articular angle,tibial sesamaid position,and first metatarsal rotation α angle were all lower in patients with good curative effect 6 months after surgery than those with poor curative effect,and the difference before and after surgery was greater than those with poor curative effect(P<0.05).(3)The area under the curve of the difference evaluation of the first metatarsal three-dimensional deformity index before and after surgery was above 0.7,and the area under the curve of the combined evaluation of all indexes was the largest(0.902),which was significantly greater than the first metatarsal rotation α angle and distal metatarsal articular angle(P<0.05).(4)The quantitative analysis of the three-dimensional deformity index of the first metatarsal in patients with hallux valgus deformity is related to the postoperative effect,which has important guiding significance for improving the accuracy and comprehensiveness of preoperative evaluation and improving the treatment plan.
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Objective:To investigate the effect of using multi-functional torticollis orthosis with manipulation in pediatric congenital myotonic torticollis. Method:In this study,60 children with congenital myotonic torticollis were randomly divided into a test group and a control group.The test group was treated with a multi-torticollis orthosis on the basis of tradition-al corrective manual therapy,while the control group was only treated with manual correction.After three months of treatment,the corrective effect of the orthosis in different neck positions of the children was ob-served.Surface electromyography(sEMG)data analysis was conducted by collecting sEMG signals of the stern-ocleidomastoid muscle in two neck positions:lateral flexion and rotation.The sEMG signal characteristics of each child's sternocleidomastoid muscle were then analyzed.Subsequently,an overall assessment of the treat-ment for the children with torticollis was performed. Result:The root mean square(RMS)values of the sternocleidomastoid surface EMG signals were significantly higher in the test group than those in the control group,with a significant difference(P＜0.05).There were sig-nificant differences between the two groups before and after treatment(P＜0.01).Overall,the total effective treatment rate in the test group was 96.67％,which was significantly higher than that in the control group,showing a significant difference(P＜0.01). Conclusion:In children with early-stage congenital muscular torticollis,the orthosis is precise,reliable,com-fortable and adjustable,and the combination of manual correction makes significant clinical outcomes and im-provements of torticollis in children.
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ObjectiveTo observe the effect of wrist-hand orthosis combined with modified constraint-induced movement therapy (mCIMT) on upper limb and hand function in patients with stroke. MethodsFrom February, 2022 to December, 2023, 32 patients after stroke in Huashan Hospital, Fudan University were randomly assigned to control group (n = 16) and experimental group (n = 16). Both groups underwent routine rehabilitation, and wore constraint glove almost four hours a day. The experimenal group wore dynamic wrist-hand orthosis four hours everyday, additionally; five days every week, for three weeks. They were evaluated with Wolf Motor Function Test (WMFT), Action Reach Arm Test (ARAT), the strength of gripping, Amount of Use (AOU) and Quality of Movement (QOM) of Motor Activity Log (MAL), Hamilton Anxiety Scale (HAMA) and Hamilton Depression Scale (HAMD) before and after treatment, while root mean square ratio of affected/healthy extensor muscle of wrist was measured with surface electromyography ResultsAfter treatment, the scores of WMFT, ARAT, MAL-QOM, HAMA and the root mean square ratio of affected/healthy extensor muscle of wrist improved in both groups (|t| > 2.179, P < 0.05), and the improvement of WMFT score and the strength of gripping was greater in the experimental group than in the control group (|t| > 2.343, P < 0.05); the strength of gripping, the scores of MAL-AOU and HAMD improved in the experimental group (|t| > 2.819, P < 0.05). ConclusionmCIMT assisted with dynamic wrist-hand orthosis could improve upper limb and hand function in stroke patients.
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Abstract Objective To evaluate the outcomes of conservative treatment using static orthoses manufactured by the Occupational Therapy Sector of our institution in participants with camptodactyly types I, II, and III in their rigid or flexible forms, to describe the demographic and clinical data, and to analyze the number of dropouts during the treatment period. Methods The Ethics in Human Research Committee approved the project under protocol number CAAE 20300419.3.0000.5273. All medical records used in the research were made available by our institution. In the present retrospective study, we did not use the informed consent form due to the impossibility of contacting the high number of participants. The study included medical records of 38 participants treated at the Occupational Therapy Outpatient Clinic from 2013 to 2019. Results Of the 54 fingers treated with orthoses, 38 were completely corrected. The rates of correction were as follows: type I in its rigid form - 100% type I in its flexible form - 81.2%; type II in its rigid form - 0%; type II in its flexible form - 100%; type III in its rigid form - 47.6%; and type III in its flexible form - 100%. Of the 93 fingers included in this study, 42% abandoned the treatment. Conclusion Static orthoses are a safe alternative to surgical procedures, with low execution complexity for camptodactyly treatment.
Resumo Objetivo Avaliar os resultados do tratamento conservador com o uso de órteses estáticas confeccionadas pelo Setor de Terapia Ocupacional da nossa instituição em participantes com camptodactilia dos tipos I, II e III, em suas formas rígida ou flexível, descrever os dados demográficos e clínicos, e avaliar o número de abandonos no período do tratamento. Métodos O projeto foi aprovado pelo Comitê de Ética em Pesquisa em Seres Humanos, com número de protocolo CAAE 20300419.3.0000.5273. Todos os prontuários utilizados na pesquisa foram disponibilizados pela nossa instituição. Não foi feito o uso de termo de consentimento livre e esclarecido (TCLE) para este estudo retrospectivo devido à impossibilidade de contactar o elevado número de participantes. Foram incluídos os prontuários de 38 participantes atendidos no Ambulatório de Terapia Ocupacional de 2013 a 2019. Resultados Dos 54 dedos tratados com órteses, 38 foram totalmente corrigidos. As taxas de correção foram as seguintes: tipo I na forma rígida -100%; tipo I na forma flexível -81,2%; tipo II na forma rígida - 0%; tipo II na forma flexível - 100%; tipo III na forma rígida -47,6%; e tipo III na forma flexível -100%. Do total de 93 dedos incluídos, 42% abandonaram o tratamento. Conclusão O uso de órteses estáticas é uma alternativa segura ao procedimento cirúrgico e de baixa complexidade de execução para o tratamento da camptodactilia.
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INTRODUCTION: Early intervention is essential for proper foot growth in postural congenital clubfoot (PCC), but little is known about its contribution to this deformity when subjects are evaluated through telemonitoring. OBJECTIVE: This study aimed to monitor the foot's flexibility of newborns diagnosed with PCC by telemonitoring them during the first months of life. METHODS: A longitudinal descriptive study was carried out with a full-term newborns group diagnosed with PCC in at least one limb, presenting a grade ≥ 0,5 on the Pirani score. Newborns with other malformations were excluded. They were assessed twice: before and 30 days after hospital discharge, and the foot flexibility classification by the Pirani score was provided. The telemonitoring occurred weekly between the assessments, and the parents were encouraged to mobilize their feet and maintain foot position using orthosis or taping. RESULTS: Thirteen newborns (eighteen feet) presenting PCC were included in this study; seven neonates discontinued the study due to absences from pre-scheduled evaluations, and six were telemonitored for 30 days. They were born at 39 weeks (± 1.18) and 3346.54 g (± 306.51). The majority of the newborns were female (69%), one was born vaginally, and eight (61%) had a family history of PCC. Pirani's score ranged from 1 to 3 in the initial assessment. After one month of telemonitoring, three feet progressed to 0, and four feet scored between 0.5 and 1. CONCLUSION: This study shows an important improvement in the foot's flexibility of newborns diagnosed with PCC evaluated through telemonitoring. Telemonitoring may be an additional resource for assisting newborns with PCC.
INTRODUÇÃO: A intervenção precoce é essencial para o correto crescimento do pé torto congênito postural (PTC), mas pouco se sabe sobre sua contribuição para essa deformidade quando os pacientes são avaliados por meio de telemonitoramento. OBJETIVO: Este estudo teve como objetivo acompanhar, por telemonitoramento, a flexibilidade do pé de recém-nascidos com diagnóstico de PTC durante os primeiros meses de vida. MÉTODOS: Foi realizado um estudo descritivo longitudinal com recém-nascidos a termo, diagnosticados com PTC em pelo menos um pé, apresentando escore de Pirani ≥ 0,5. Foram excluídos recém-nascidos com outras malformações. Os recém-nascidos foram avaliados nas primeiras horas de vida e 30 dias após a alta hospitalar. Durante este período os pais foram incentivados a mobilizar os pés diariamente e manter a posição por meio de órtese ou bandagem. O telemonitoramento ocorreu semanalmente, e a flexibilidade dos pés foi classificada pelo escore de Pirani. RESULTADOS: Foram incluídos neste estudo treze recém-nascidos (dezoito pés), sete descontinuaram o estudo por faltas nas tentativas de contato e seis foram telemonitorados por 30 dias. A maioria dos RN era do sexo feminino (69%), nasceram com 39 semanas (± 1,18) e 3.346,54g (± 306,51). Um nasceu de parto normal e oito (61%) tinham histórico familiar de PTC. Inicialmente, a pontuação de Pirani variou de 1 a 3. Após 30 dias de telemonitoramento, três pés evoluíram para 0 e quatro pontuaram entre 0,5 e 1. CONCLUSÃO: Este estudo mostra uma melhora importante na flexibilidade do pé de recém-nascidos com diagnóstico de PTC, avaliados por telemonitoramento. O telemonitoramento pode ser um recurso adicional para assistência ao recém-nascido com PTC.
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Pied bot , Orthèses , Nouveau-néRÉSUMÉ
ObjectiveTo investigate the in-brace and short-term correction of 3D-printed scoliosis orthoses. MethodsFrom July to December 2021, 36 patients with adolescent idiopathic scoliosis from Ninth People's Hospital, Shanghai Jiaotong University School of Medicine were selected to complete full-length radiographs of the spine before and immediately after wearing the orthosis. They wore the orthosis more than 20 hours a day, and took radiographs six months later. Cobb angle was calculated. They were assessed with Chinese version of the Scoliosis Research Society's outcomes instrument 22 (SRS-22) before wearing and six months follow-up. ResultsThe mean Cobb angle was (22.10±6.29)° before wearing, and it was (7.85±10.90)° immediately after wearing (t = 4.775, P < 0.01) and (14.33±0.74)° six months follow-up (t = 4.189, P < 0.01). The score of functional status of SRS-22 increased six months follow-up (Z = -2.676, P < 0.01). The Cobb angle immediately after wearing correlated with the Cobb angle six months follow-up (r = 0.826, P < 0.05). Conclusion3D-printed scoliosis orthoses can correct the scoliosis satisfactorily, in-brace and in short-term.
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Background and Objective The Projects of Global Growth of Medical Technologies, implemented by NCGM since 2015, have contributed to human resource development through on-site training in partner countries and training in Japan. However, since 2020, online training has become mainstream due to the travel restrictions by COVID-19 impact. As one of the projects, the NCGM and Bach Mai Hospital rehabilitation departments in Vietnam held an interactive online hands-on seminar in FY2022 for Vietnamese occupational therapists and others to provide technical guidance for making splint orthoses to rehabilitate patients with hand dysfunction. This paper aims to report on the preparation and implementation process of the seminar and its results.Preparation and Implementation of the Seminar NCGM (the instructor) and Bach Mai Hospital (the site of the hands-on training) prepared the seminar through regular online meetings, fostering ownership and collaborative planning on the Vietnamese side, and discussed the program development, necessary materials, participant selection, and obtaining authorization from the Vietnamese Ministry of Health. To ensure the quality of the technical instruction, the seminar was connected via Zoom to both NCGM and Bach Mai Hospital, where the live video of the splinting technique was conducted, along with explanations and Q&A sessions. The post-training evaluation was carried out through a questionnaire with self-assessment of the participants about the knowledge and skills they obtained. Outcome and Discussion As a result, 96% (27/28) of the participants answered that the seminar was “useful for clinical practice,” suggesting that the interactive online hands-on seminar regarding technical instruction in making splint orthosis was as good as or better than the face-to-face training. We found that the Vietnamese side took ownership from the preparatory stage by establishing a regular online meeting system; the quality of the training was assured by live video by both sides, which enabled detailed technical instruction; the training provider’s skills were improved by more detailed preparation; training was cost-effective compared to on-site training or training in Japan; and the materials used and the training videos can be used as teaching materials, which is expected local benefits and sustainability. These findings can be applied to face-to-face training to make the training more effective and extended as a useful method when similar activities are developed in other countries.
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SUMMARY OBJECTIVE: Finger splints are used as a treatment option in tendon, bone, and soft tissue injuries. For immobilization, custom-made splints and prefabricated finger splints are used. In splints made for immobilization, it is aimed to limit joint movement. The aim of our study is to reveal how much custom-made splints and prefabricated finger splints limit joint motion (flexion angle in proximal interphalangeal and distal interphalangeal joints). METHODS: Custom-made splints and prefabricated finger splints were applied to the second fingers of the dominant side in a total of 40 individuals, 20 women and 20 men, not having any health problems. Individuals were asked to flex and joint motion was measured with the iPhone compass application. RESULTS: The mean distal interphalangeal joint angle values of the participants measured by prefabricated finger splints were found to be 24.27±8.29, and the mean distal interphalangeal joint angle values measured by custom-made splints was 0.52±1.50. There was a difference between the participants' distal interphalangeal joint angle values measured by prefabricated finger splints and custom-made splints (p<0.001). distal interphalangeal joint angle values measured with custom-made splints were significantly smaller than those measured with prefabricated finger splint. The mean of the participants' proximal interphalangeal joint angle values measured by prefabricated finger splints was 16.55±7.90, and the proximal interphalangeal joint angle values measured by custom-made splints was "0" for all participants. There was a difference between the participants' proximal interphalangeal joint angle values measured by prefabricated finger splints and custom-made splints (p<0.001). Distal interphalangeal joint angle values measured with custom-made splints were significantly smaller than those measured with prefabricated finger splints. CONCLUSION: According to our study, custom-made splints can significantly reduce the flexion of the finger interphalangeal joints compared to prefabricated finger splints.
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Objective For patients with foot drop gait, to design a kind of anterior ankle foot orthosis (AFO) with adjustable stiffness, so as to restore natural gait of the ankle by limiting the patients’ unusual plantar flexion to the optimum extent. Methods The minimum orthodontic moment of 10 foot drop male patients was measured by self-made experimental equipment, which could be used to select optimum material modulus of the AFO. The relationship between elastic modulus and different filling structures and filling ratio parameters was studied by tensile test. A typical patient with foot drop was selected, and the anterior AFO fitting the shape of patient’s foot was quickly made by three-dimensional (3D) printing with foot geometric data and specific filling material, filling structure and filling rate. The kinematics and surface electromyography (sEMG) of plantar flexors were tested under barefoot and wearing two kinds of AFOs, so as to verify the effect of the AFO on plantar flexion. The effectiveness of the limitation and the degree of preservation of ankle valgus and plantar flexion were discussed. Results The minimum corrective torque required for 10 male patients with foot drop was 2.16 N·m. Compared with the rigid AFO, the range of motion (ROM) of plantar flexion and valgus increased by 67.8% and 88.6% respectively with the flexible AFO. The activation of the muscles responsible for plantar flexion (soleus, medial head of gastrocnemius and lateral head of gastrocnemius) also decreased by 38.3%, 46.6% and 55.8%. Conclusions This AFO with adjustable stiffness can be used for orthosis customization of patients with foot drop, providing more effective and long-term orthosis function and potential.
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Objective:To observe any effect of a half palm ankle-foot orthosis and a hollow-heel ankle-foot orthosis on the gait of stroke survivors.Methods:The walking of twenty-five stroke survivors was quantified using a gait analysis system. They walked barefoot, wearing a half palm ankle-foot orthosis and wearing a hollow-heel ankle-foot orthosis. Walking speed, step frequency, duration of the swing phase on the healthy and affected sides, risk of falling and Timed Up and Go (TUG) test times were recorded and analyzed.Results:The average gait frequency when wearing the hollow-heel ankle-foot orthosis was significantly faster than that in the other two conditions. The gait asymmetry coefficient was significantly different when the subjects wore the hollow-heel ankle-foot orthosis compared with walking barefoot. Compared with being barefoot, the average TUG time was significantly shorter when wearing either orthosis and the risk of falling was significantly less. The fall risk was significantly lower when wearing the hollow-heel orthosis compared to the half palm orthosis.Conclusion:Wearing either ankle-foot orthosis can significantly correct the gait of stroke survivors and lower their risk of falling, with better effect when wearing the hollow-heel ankle-foot orthosis.
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Objective To evaluate the efficacy of additive manufacturing scoliosis orthosis, by simulation on interaction of the bone, trunk and orthosis using finite element method. Methods Combined with CT data of the patients, three-dimensional (3D) scanning model of the trunk and full length X-ray of the spine, the bone-trunk-orthosis finite element model was established and proved to be effective. The change and development trend of Cobb angle of the main thoracic scoliosis was calculated under different boundary and load conditions. Results The treatment effect of the additive manufacturing scoliosis orthosis was good. With the increase of orthotic preload, the improvement of Cobb angle and pelvic tilt was more obvious. The Cobb angle was expected to decrease by 6.18° after application of 70 N preload to the orthosis for 6 months. In the case of increasing system stiffness, Cobb angle improvement was not obvious and became even worse. Conclusions Additive manufacturing scoliosis orthosis is effective for treating adolescents with immature bones, while for patients with mature or degenerative bones, its treatment effect is poor.
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A micro silicone oil liquid spring was designed and manufactured in this article. The performance of the liquid spring was studied by simulation analysis and mechanical test. A self-force source power-assisted knee orthosis was designed based on the liquid spring. This power-assisted knee orthosis can convert the kinetic energy of knee flexion into the elastic potential energy of liquid spring for storage, and release elastic potential energy to generate assisted torque which drives the knee joint for extension. The results showed that the average maximum reset force of the liquid spring was 1 240 N, and the average maximum assisted torque for the knee joint was 29.8 N·m. A musculoskeletal multibody dynamic model was used to analyze the biomechanical effect of the knee orthosis on the joint during knee bending (90°knee flexion). The results showed that the power-assisted knee orthosis could effectively reduce the biomechanical load of the knee joint for the user with a body weight of 80 kg. The maximum forces of the femoral-tibial joint force, patellar-femoral joint force, and quadriceps-ligament force were reduced by 24.5%, 23.8%, and 21.2%, respectively. The power-assisted knee orthosis designed in this article provides sufficient assisted torque for the knee joint. It lays a foundation for the subsequent commercial application due to its small size and lightweight.
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Phénomènes biomécaniques , Articulation du genou , Fémur , Ligaments , OrthèsesRÉSUMÉ
Objective:To compare the effects of compression garment combined with orthosis for central face on facial burn scar to compression garment and 3D compression mask. Methods:From September, 2016 to June, 2019, 38 facial burn scar patients received compression therapy in Department of Burns and Cutaneous Surgery, the First Affiliated Hospital of Air Force Medical University. According to their preference, they wore compression garment only (CG group, n = 15), compression garment and orthosis for central face (CO group, n = 17) and 3D compression mask (3D group, n = 6) for a year. The facial scar was assessed with Vancouver Scar Scale (VSS) before and after treatment, and the comfort and medical cost was investigated with questionnaire. Results:The VSS score decreased after treatment in all the groups (F = 18.49, P < 0.05), while the VSS score was higher in CG group than in CO group (1.717 points, 95%CI 0.925 to 2.482, P < 0.001) and 3D group (1.782 points, 95%CI 0.738 to 2.827, P < 0.001), the difference was less between CO group and 3D group (0.065 points, 95%CI -0.957 to 1.088, P = 1.000). The comfort rate was 60%, 52.9% and 66.7% for CG group, CO group and 3D group, respectively, with no significant difference (P > 0.05). The medical cost was the most for 3D group (12 000 to 16 000 Yuan), and similar for CG group (3000 to 4800 Yuan) and CO group (3300 to 5300 Yuan). Conclusion:Compression garment combined with orthosis for central face is more effective on facial burn scar, similar to 3D compression mask, but cheaper than 3D mask, which can be a choice for facial scar patients in developing areas.
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Purpose：We investigated the factors associated with medical device-related pressure ulcer (MDRPU) due to lower extremity orthosis in patients undergoing convalescent rehabilitation for stroke.Methods：This retrospective study included patients with stroke who wore ankle foot orthosis in the convalescent rehabilitation ward. We measured the following items at admission：Brunnstrom recovery stage, presence of sensory disturbance, exhibition of unilateral spatial neglect, functional independence measures at admission and discharge, and presence of MDRPU. In the statistical analysis, logistic regression analysis was performed to identify the significant factors associated with MDRPU.Results：Ninety-five participants were enrolled in this study (mean age：54.9 ± 11.6 years, Male：78.9%). In logistic regression analysis, Age (odds ratio＝1.05, 95% confidence interval＝1.01-1.10, p＜0.05) and the presence of sensory disturbance (odds ratio＝5.17, 95% confidence interval＝1.39-19.28, p＜0.05) at admission was extracted as the cause of MDRPU.Conclusion：Sensory disturbance at admission is associated with MDRPU in patients undergoing convalescent rehabilitation for stroke who wear ankle foot orthosis.
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Purpose：We investigated the factors associated with medical device-related pressure ulcer (MDRPU) due to lower extremity orthosis in patients undergoing convalescent rehabilitation for stroke.Methods：This retrospective study included patients with stroke who wore ankle foot orthosis in the convalescent rehabilitation ward. We measured the following items at admission：Brunnstrom recovery stage, presence of sensory disturbance, exhibition of unilateral spatial neglect, functional independence measures at admission and discharge, and presence of MDRPU. In the statistical analysis, logistic regression analysis was performed to identify the significant factors associated with MDRPU.Results：Ninety-five participants were enrolled in this study (mean age：54.9 ± 11.6 years, Male：78.9%). In logistic regression analysis, Age (odds ratio＝1.05, 95% confidence interval＝1.01-1.10, p＜0.05) and the presence of sensory disturbance (odds ratio＝5.17, 95% confidence interval＝1.39-19.28, p＜0.05) at admission was extracted as the cause of MDRPU.Conclusion：Sensory disturbance at admission is associated with MDRPU in patients undergoing convalescent rehabilitation for stroke who wear ankle foot orthosis.
RÉSUMÉ
Objective：The knee joint in patients using a knee-ankle-foot orthosis (KAFO) is locked, and the lack of knee flexion can cause some problems in the gait, such as circumduction and excessive pelvic obliquity. Hence, a KAFO with knee flexion control was developed. This study aimed to compare the gait in stroke patients using KAFOs with a locked knee joint and a controlled knee joint.Methods：A newly developed electro-attractive-material (EAM) was used for the knee joint in the KAFO. The knee joint is locked in the stance phase, and released immediately after the manual switch is pushed by a physical therapist.The gait of seven stroke patients in the recovery phase was measured for KAFO with a locked knee joint (locked knee) and a controlled knee joint (EAM knee) . For gait measurement, an inertial sensor, a foot switch, and an EMG sensor were used.Results：The velocity increased and the swing time decreased in the EAM-knee as compared to the locked knee. The abduction, external rotation, and extension of the hip joint decreased in the EAM knee. Increased activity of the rectus femoris muscle in the loading response, and decreased activity of the longissimus doris in the swing phase were observed in the EAM knee.Conclusions：It was suggested that EAM KAFO could improve the gait parameter and reduce the movement on the paretic side by compensatory motions in the swing phase, thereby reducing the muscle activity of the longissimus doris muscle.
RÉSUMÉ
BACKGROUND: At present, the traditional orthosis manufacturing technology needs a lot of time and materials. The larger expansion coefficient of gypsum and the springback of material cooling will reduce the accuracy of orthosis. Therefore, the application of computer-aided design technology and three-dimensional printing technology in the field of orthosis is booming. OBJECTIVE: Based on the concept of multidisciplinary collaboration, a new scoliosis orthopedic device was designed and manufactured by optical scanning, computer-aided design and 3D printing, and its correction effect was evaluated. METHODS: Seven adolescent idiopathic scoliosis patients, who were treated in the Three-Dimensional Printing Center of Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University between March and October 2019, were enrolled in this study. The patient’s trunk was scanned with three-dimensional scanner. Virtual orthopedic treatment was conducted in Rodin4D software. Data were imported into Magics to carry out the hollow out design of orthosis, which was made by three-dimensional printing technology. Seven patients were followed up for 6 months after wearing orthopedic devices for more than 20 hours every day. The scoliosis before and after intervention was analyzed to observe the clinical efficacy. RESULTS AND CONCLUSION: (1) The contactless iPad scanner was successfully used for mold taking. The orthopedic model was designed in the French Rodin4D software, and the orthopedic model was hollowed-out by the Magics software. A suitable three-dimensional printed personalized scoliosis orthopedic device was produced through three-dimensional printing. (2) All the seven patients were improved significantly. Cobb angle before treatment was (29.43±7.68)°, and the angle of trunk inclination was (11.57±2.76)°. At 6 months after treatment, Cobb angle was (8.71±5.96)° (corrected 72%), and the angle of trunk inclination was (3.57±2.57)° (corrected 70%). The Cobb angle and angle of trunk inclination were significantly different before and after treatment (P < 0.01). (3) The digital medicine and 3D printing technology are applied in the field of rehabilitation AIDS, based on the concept of multidisciplinary collaboration. The production of personalized scoliosis orthopedic program is feasible, and the orthopedic rehabilitation effect is remarkable.