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Mechanical properties of a spring-hinged floor reaction orthosis
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ESMAC 2012 abstract / Gait & Posture 38 (2013) S1–S116
Discussion and conclusions: The first case has showed therapeutic effect of wearing HAL and the second and the last showed function improvements while wearing HAL. The current problems about clinical use of HAL found through this trial are it’s lack in corrective function for deformation and in controlling function for standing balance. http://dx.doi.org/10.1016/j.gaitpost.2013.07.165 P69 Mechanical properties of a spring-hinged floor reaction orthosis
Discussion and conclusions: Our results indicate that the five springs seem to be useful in optimizing orthoses with respect to energy cost of walking in children with CP. Hysteresis, probably mainly caused by friction of the spring in the shaft of the hinge, is present in all springs, resulting in a loss of energy that potentially could be used for ankle push-off. Nevertheless, FROs with integrated springs might still be more beneficial compared to conventional FROs, in which no energy can be stored at all. However, it remains unknown whether the stiffness of the springs is sufficient to counteract knee flexion in stance. This will be subject of further research to investigate the effects of the mechanical properties of the springs on gait in CP.
Yvette L. Kerkum, Merel A. Brehm, Annemieke I. Buizer, Josien C. Van den Noort, Jaap Harlaar
Further reading
VU University Medical Center, Rehabilitation Medicine, Amsterdam, The Netherlands
[1] Rogozinski, et al. The Journal of Bone & Joint Surgery 2009;91:2440–7. [2] Bregman, et al. Neurorehabilitation and Neural Repair 2011, submitted. [3] Bregman, et al. Gait & Posture 2009;30(2):144–9.
Introduction: For children with cerebral palsy (CP) whose gait pattern is characterized by excessive knee flexion in midstance, a Floor Reaction Orthosis (FRO) is commonly prescribed. FROs are very stiff and aim to counteract excessive knee flexion in midstance, by shifting the ground reaction force anteriorly. Although an FRO is effective in this respect [1], it impedes plantar flexion in preswing, thereby obstructing push-off power. A spring-like FRO could potentially be more beneficial, since it can store energy at the beginning of the stance phase, being returned in preswing, thereby creating ankle push-off power. Literature shows that energy cost of walking with a typical spring-like Ankle-Foot Orthosis can be minimized by selecting an optimal stiffness [2]. Recently, a new type of hinge with adjustable springs was designed, which can be integrated into an FRO. However, exact knowledge of the mechanical properties of the hinge is lacking. This study aims to quantify the mechanical properties of this new hinge build within an FRO. Patients/materials and methods: One test FRO with an integrated 14 mm Neuro Swing® ankle joint (Fior & Gentz, Germany) was constructed. We used five springs within the hinge, with different stiffnesses. The spring’s mechanical properties were measured with BRUCE [3]. Each spring was fully compressed and released slowly (i.e. a few seconds for the whole range of motion (ROM)) three times, while the hinge angle and the exerted net moment were continuously measured [3]. ROM (deg) (i.e. elastic range), stiffness (Nm/deg) (i.e. slope of the linear fit of the relation between angle and net joint moment in the ROM), threshold (Nm) (i.e. exerted moment at the start of ROM), and hysteresis [%ESTOR ] (i.e. storage (ESTOR ) minus release (ERLS ) of energy) were averaged for each spring. ESTOR was defined as the surface underneath the compression phase (upper line) and ERLS as the surface underneath the release phase (lower line). Results
http://dx.doi.org/10.1016/j.gaitpost.2013.07.166 P71 An electromyographic study of patients with masticatory muscle disorders: A randomozed controlled clinical trial Daniela Aparecida Biasotto-Gonzalez 1 , Tabajara de Oliveira Gonzalez 2 , Fabiano Politti 2 , Daniel Ventura de Andrade 1 , Yasmin El Hage 1 , Cid André Fidelis de Paula Gomes 2 , Dowglas Fernando Magalhães de Sousa 1 , Graziela F. Aparecido 1 , Carolina M. Herpich 1 , Cesar Ferreira Amorin 3 , Fausto Berzin 4 1 July Nine University, Master of Rehabilitation Sciences, São Paulo, Brazil 2 July Nine University, Physiotherapy, São Paulo, Brazil 3 Cidade de São Paulo University, Physiotherapy Master’s Program, São Paulo, Brazil 4 College of Dentistry, State University of Campinas, Morphology, Piracicaba, Brazil
Introduction: The most common etiologic agent regarding the myogenic TMD is the muscular hyperactivity. This hyperactivity can contribute to internal disarrangements of the TMJ. Several treatment options are proposed to muscular disorder [1]. Nevertheless, the intent of this project is to assess the physiotherapeutic and odontologic approach of massage therapy and occlusal splint in miogenic TMD volunteers through the analysis of the
ESMAC 2012 abstract / Gait & Posture 38 (2013) S1–S116
Discussion and conclusions: The first case has showed therapeutic effect of wearing HAL and the second and the last showed function improvements while wearing HAL. The current problems about clinical use of HAL found through this trial are it’s lack in corrective function for deformation and in controlling function for standing balance. http://dx.doi.org/10.1016/j.gaitpost.2013.07.165 P69 Mechanical properties of a spring-hinged floor reaction orthosis
Discussion and conclusions: Our results indicate that the five springs seem to be useful in optimizing orthoses with respect to energy cost of walking in children with CP. Hysteresis, probably mainly caused by friction of the spring in the shaft of the hinge, is present in all springs, resulting in a loss of energy that potentially could be used for ankle push-off. Nevertheless, FROs with integrated springs might still be more beneficial compared to conventional FROs, in which no energy can be stored at all. However, it remains unknown whether the stiffness of the springs is sufficient to counteract knee flexion in stance. This will be subject of further research to investigate the effects of the mechanical properties of the springs on gait in CP.
Yvette L. Kerkum, Merel A. Brehm, Annemieke I. Buizer, Josien C. Van den Noort, Jaap Harlaar
Further reading
VU University Medical Center, Rehabilitation Medicine, Amsterdam, The Netherlands
[1] Rogozinski, et al. The Journal of Bone & Joint Surgery 2009;91:2440–7. [2] Bregman, et al. Neurorehabilitation and Neural Repair 2011, submitted. [3] Bregman, et al. Gait & Posture 2009;30(2):144–9.
Introduction: For children with cerebral palsy (CP) whose gait pattern is characterized by excessive knee flexion in midstance, a Floor Reaction Orthosis (FRO) is commonly prescribed. FROs are very stiff and aim to counteract excessive knee flexion in midstance, by shifting the ground reaction force anteriorly. Although an FRO is effective in this respect [1], it impedes plantar flexion in preswing, thereby obstructing push-off power. A spring-like FRO could potentially be more beneficial, since it can store energy at the beginning of the stance phase, being returned in preswing, thereby creating ankle push-off power. Literature shows that energy cost of walking with a typical spring-like Ankle-Foot Orthosis can be minimized by selecting an optimal stiffness [2]. Recently, a new type of hinge with adjustable springs was designed, which can be integrated into an FRO. However, exact knowledge of the mechanical properties of the hinge is lacking. This study aims to quantify the mechanical properties of this new hinge build within an FRO. Patients/materials and methods: One test FRO with an integrated 14 mm Neuro Swing® ankle joint (Fior & Gentz, Germany) was constructed. We used five springs within the hinge, with different stiffnesses. The spring’s mechanical properties were measured with BRUCE [3]. Each spring was fully compressed and released slowly (i.e. a few seconds for the whole range of motion (ROM)) three times, while the hinge angle and the exerted net moment were continuously measured [3]. ROM (deg) (i.e. elastic range), stiffness (Nm/deg) (i.e. slope of the linear fit of the relation between angle and net joint moment in the ROM), threshold (Nm) (i.e. exerted moment at the start of ROM), and hysteresis [%ESTOR ] (i.e. storage (ESTOR ) minus release (ERLS ) of energy) were averaged for each spring. ESTOR was defined as the surface underneath the compression phase (upper line) and ERLS as the surface underneath the release phase (lower line). Results
http://dx.doi.org/10.1016/j.gaitpost.2013.07.166 P71 An electromyographic study of patients with masticatory muscle disorders: A randomozed controlled clinical trial Daniela Aparecida Biasotto-Gonzalez 1 , Tabajara de Oliveira Gonzalez 2 , Fabiano Politti 2 , Daniel Ventura de Andrade 1 , Yasmin El Hage 1 , Cid André Fidelis de Paula Gomes 2 , Dowglas Fernando Magalhães de Sousa 1 , Graziela F. Aparecido 1 , Carolina M. Herpich 1 , Cesar Ferreira Amorin 3 , Fausto Berzin 4 1 July Nine University, Master of Rehabilitation Sciences, São Paulo, Brazil 2 July Nine University, Physiotherapy, São Paulo, Brazil 3 Cidade de São Paulo University, Physiotherapy Master’s Program, São Paulo, Brazil 4 College of Dentistry, State University of Campinas, Morphology, Piracicaba, Brazil
Introduction: The most common etiologic agent regarding the myogenic TMD is the muscular hyperactivity. This hyperactivity can contribute to internal disarrangements of the TMJ. Several treatment options are proposed to muscular disorder [1]. Nevertheless, the intent of this project is to assess the physiotherapeutic and odontologic approach of massage therapy and occlusal splint in miogenic TMD volunteers through the analysis of the