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How does the height of a chair influence the pressure distribution inside and underneath a transfemoral prosthetic socket whilst seated?
Jönköping University, School of Health and Welfare.
Jönköping University, School of Health and Welfare.
2016 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Hur påverkas tryckfördelningen inuti och under en transfemoral proteshylsa av höjden på en stol under sittande? (Swedish)
Abstract [en]

Although sitting is a large part of everyday life is the influence of the sitting positions and chair design on pressure and load distribution as well as comfort for transfemoral amputees quite unexplored. The aim of this study was therefore to examine this further.

Two transfemorally amputated females (49 and 57 years old) participated in the study. Three positions were examined for each subject; sitting without foot support and sitting with the knee joints flexed 90◦ and 105◦. The pressure inside the socket was measured by two pressure sensors, placed distally and proximally on the posterior wall inside the socket. The lengthwise pressure distribution and the sidewise load distribution between the socket and the underlying material was measured by a pressure mat. In addition to this, the subjects answered a questionnaire regarding the subjective comfort for each position. 

The result showed that the pressure underneath the socket were higher distally than proximally without foot support. The pressure transferred proximally as the knee became more flexed. The most even load distribution sidewise was found when the subjects sat with their knees flexed 105 degrees. Sitting with the knees flexed 90◦ was ranked as the most comfortable position. No conclusion could be made regarding the pressure inside of the socket. Additionally, according to this study the level of comfort does not have any clear relation with the sidewise load distribution or the longitudinal pressure distribution.                  

Abstract [sv]

En stor del av livet spenderas sittandes, men den påverkan som sittposition och stoldesign har på tryckfördelning och komfort för transfemoralt amputerade är ganska outforskat. Studien ämnar därför undersöka detta.

Två transfemoralt amputerade kvinnor (49 och 57 år) medverkade i studien. Tre sittpositioner undersöktes för varje testperson; sittande utan fotstöd samt sittande med knäleden i 90◦ respektive 105◦ flexion. Trycket inuti hylsan mättes med hjälp av två trycksensorer, som placerades distalt och proximalt på den bakre hylsväggen. Tryckfördelningen i längsriktningen och lastfördelningen i sidled mellan hylsan och underlaget mättes med en tryckmatta. Förutom detta svarade testpersonerna även på ett frågeformulär angående den subjektiva komforten för varje position.

Resultatet visade att trycket under hylsan var högre distalt än proximalt när inget fotstöd användes. Trycket förflyttades proximalt då knät böjdes. Den mest jämna lastfördelningen mellan sidorna påträffades när knät var flekterat 105◦. Enligt frågeformuläret var den mest bekväma positionen den med 90◦ i knäleden. Ingen slutsats kunde göras angående trycket inuit hylsan. Ingen tydlig relation kunde heller inte hittas mellan den subjektiva komforten och tryck- eller lastfördelningen. 

Place, publisher, year, edition, pages
2016. , 23 p.
Keyword [en]
transfemoral amputee, pressure distribution, load distribution, sitting, subjective comfort
Keyword [sv]
transfemoralt amputerade, tryckfördelning, lastfördelning, sittande, subjektiv komfort
National Category
Other Medical Sciences not elsewhere specified
URN: urn:nbn:se:hj:diva-30523ISRN: JU-HHJ-OTE-1-20160009OAI: diva2:936817
Subject / course
HHJ, Prosthetic and Orthotic
2016-06-07, Science Center, Jönköping, 11:00 (Swedish)
Available from: 2016-06-15 Created: 2016-06-14 Last updated: 2016-06-15Bibliographically approved

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Hägg, JenniferNielsen, Signe Sander
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