Effect of Seat Inclination on Seated Pressures of Individuals With Spinal Cord Injury

Maurer, Christine L.; Sprigle, Stephen

doi:10.1093/ptj/84.3.255

Cited by 38 publications

(16 citation statements)

References 11 publications

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“…Although a reduction in the pressure on the ischial tuberosity was found, there was an increase in the peak pressure on the sacrococcygeal region. Furthermore, the study of Maurer and Sprigle 31 ) found no indication that increasing seat angle implies in increased seat interface pressure. Their results showed that less pressure was concentrated under the ischial tuberosities with increasing seat inclination, which seems to load slightly more body weight under the thighs and away from the ishcial tuberosities.…”

Section: Seat and Backrest Anglementioning

confidence: 96%

Aspects of Manual Wheelchair Configuration Affecting Mobility: A Review

et al. 2014

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Many aspects relating to equipment configuration affect users’ actions in a manual wheelchair, determining the overall mobility performance. Since the equipment components and configuration determine both stability and mobility efficiency, configuring the wheelchair with the most appropriate set-up for individual users’ needs is a difficult task. Several studies have shown the importance of seat/backrest assembly and the relative position of the rear wheels to the user in terms of the kinetics and kinematics of manual propulsion. More recently, new studies have brought to light evidence on the inertial properties of different wheelchair configurations. Further new studies have highlighted the handrim as a key component of wheelchair assembly, since it is the interface through which the user drives the chair. In light of the new evidence on wheelchair mechanics and propulsion kinetics and kinematics, this article presents a review of the most important aspects of wheelchair configuration that affect the users’ actions and mobility.

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Section: Seat and Backrest Anglementioning

confidence: 96%

Aspects of Manual Wheelchair Configuration Affecting Mobility: A Review

et al. 2014

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“…To increase the base of support and to bring the body centre of mass closer to the support surface, wheelchair-users who lack postural control often adopt a static kyphotic spinal posture with posterior tilted pelvis Tooms, 1992, Koo et al, 1996). Some individuals even recline the seat support and squeeze the pelvis and lower spine against the backrest for additional postural stability during upperbody movement tasks (Maurer and Sprigle, 2004). Such seating conditions allow much internal and external perturbation before reaching the boundaries of postural instability which makes that very little postural control is needed to remain posturally stable (Seelen et al, 1997).…”

Section: 1mentioning

confidence: 99%

“…To increase the base of support and to bring the body centre of mass closer to the support surface, individuals who lack postural control often adopt a kyphotic spine posture with posterior tilted pelvis Tooms, 1992, Koo et al, 1996). Some individuals even recline the seat support and squeeze the pelvis and lower spine against the backrest for extra postural stability during upper-extremities movement tasks (Maurer and Sprigle, 2004). Clinical observations have indicated that many impaired individuals 'feel' more stable when sitting with posterior tilted pelvis (Maurer and Sprigle, 2004).…”

Section: Mobility Problems 13mentioning

confidence: 99%

“…Some individuals even recline the seat support and squeeze the pelvis and lower spine against the backrest for extra postural stability during upper-extremities movement tasks (Maurer and Sprigle, 2004). Clinical observations have indicated that many impaired individuals 'feel' more stable when sitting with posterior tilted pelvis (Maurer and Sprigle, 2004). However, such flexed spine postures have negative influence on body movement in forward direction (Faiks and Reinecke, 1998).…”

Section: Mobility Problems 13mentioning

confidence: 99%

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Dynamic sitting

Geffen¹

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Individuals who cannot functionally reposition themselves adopt a passive body posture and suffer from physical discomfort in long-term sitting. To regulate body load and to prevent sitting related mobility problems, proper postural control is important. The inability to reposition underlines the importance for seating interventions that control body posture from automatic chair adjustments. We developed an adjustable simulator chair that allows the alignment of the trunk, pelvis and thighs to be controlled independently. This study describes the system for decoupled body segments adjustment and develops a predictive model that computes angular chair configuration for desired body postures. Eighteen healthy male subjects participated in this study. The experiment involved a protocol of five trials, each investigating the effect of individual chair segment angle adjustment on body segments rotation. Quasi-static chair adjustments were performed, in which angular chair configuration and body segments orientation were measured using an infrared motion capturing system and an inertial sensor attached on the pelvis. Linear best-fit equations together with the coefficients of determination were computed. Significant relations have been found between angular chair configuration and body segments orientation leading to an algorithm that predicts chair configuration for desired body posture. The predictive algorithm seems applicable to compute angular chair configuration for desired body posture when the initial body-chair configuration in known. For clinical application, future experiments must be performed on impaired individuals to validate the algorithm in terms of accuracy.

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“…As a potential posture support device, several practical issues needed to be considered. Firstly, the support surface for a seat may be under as high as about 200 mmHg pressure [ 21 , 22 ]. Hence, a system should sustain such loading and actively produce higher pressures/forces to change the shape under high loading.…”

Section: System Design and Implementationmentioning

confidence: 99%

Development of a Modularized Seating System to Actively Manage Interface Pressure

Yu¹,

Chou²,

Chen³

et al. 2014

Sensors

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Pressure ulcers can be a fatal complication. Many immobile wheelchair users face this threat. Current passive and active cushions do reduce the incidence of pressure ulcers and they have different merits. We proposed an active approach to combine their advantages which is based on the concept that the interface pressure can be changed with different supporting shapes. The purpose of this paper is to verify the proposed approach. With practical applications in mind, we have developed a modular system whose support surface is composed by height-adjustable support elements. Each four-element module was self-contained and composed of force sensors, position sensors, linear actuators, signal conditioners, driving circuits, and signal processors. The modules could be chained and assembled together easily to form different-sized support surfaces. Each support element took up a 3 cm × 3 cm supporting area. The displacement resolution was less than 0.1 mm and the force sensor error was less than 1% in the 2000 g range. Each support element of the system could provide 49 N pushing force (408 mmHg over the 3 cm × 3 cm area) at a speed of 2.36 mm/s. Several verification tests were performed to assess the whole system's feasibility. Further improvements and clinical applications were discussed. In conclusion, this modularized system is capable of actively managing interface pressure in real time.

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Effect of Seat Inclination on Seated Pressures of Individuals With Spinal Cord Injury

Cited by 38 publications

References 11 publications

Aspects of Manual Wheelchair Configuration Affecting Mobility: A Review

Aspects of Manual Wheelchair Configuration Affecting Mobility: A Review

Dynamic sitting

Development of a Modularized Seating System to Actively Manage Interface Pressure

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