Journal article
Axial bone-socket displacement for persons with a traumatic transtibial amputation: The effect of elevated vacuum suspension at progressive body-weight loads
Prosthetics and orthotics international, Vol.40(5), pp.552-557
10/2016
DOI: 10.1177/0309364615605372
PMID: 26423107
Abstract
Elevated vacuum suspension systems use a pump to draw air from the socket with the intent of reducing bone-socket motion as compared to passive suction systems. However, it remains unknown if elevated vacuum suspension systems decrease limb displacement uniformly during transitions from unloaded to full-body-weight support.
To compare limb-socket motion between elevated vacuum and passive suction suspension sockets using a controlled loading paradigm.
Comparative analysis.
Persons with transtibial amputation were assessed while wearing either an elevated vacuum or passive suction suspension socket. Digital video fluoroscopy was used to measure axial bone-socket motion while the limb was loaded in 20% body-weight increments. An analysis of variance model was used to compare between suspension types.
Total axial displacement (0%-100% body weight) was significantly lower using the elevated vacuum (vacuum: 1.3 cm, passive suction: 1.8 cm; p < 0.0001). Total displacement decreased primarily due to decreased motion during initial loading (0%-20%; p < 0.0001). Other body-weight intervals were not significantly different between systems.
Elevated vacuum suspension reduced axial limb-socket motion by maintaining position of the limb within the socket during unloaded conditions. Elevated vacuum provided no meaningful improvement in limb-socket motion past initial loading.
Excessive bone-socket motion contributes to poor residual limb health. Our results suggest elevated vacuum suspensions can reduce this axial displacement. Visual assessment of the images suggests that this occurs through the reduction or elimination of the air pocket between the liner and socket wall while the limb is unloaded.
Details
- Title: Subtitle
- Axial bone-socket displacement for persons with a traumatic transtibial amputation: The effect of elevated vacuum suspension at progressive body-weight loads
- Creators
- Benjamin J Darter - Department of Physical Therapy, Virginia Commonwealth University, Richmond, VA, USA bjdarter@vcu.eduKirill Sinitski - Center for the Intrepid, Department of Orthopaedics and Rehabilitation, San Antonio Military Medical Center, JBSA, Fort Sam Houston, TX, USAJason M Wilken - Center for the Intrepid, Department of Orthopaedics and Rehabilitation, San Antonio Military Medical Center, JBSA, Fort Sam Houston, TX, USA
- Resource Type
- Journal article
- Publication Details
- Prosthetics and orthotics international, Vol.40(5), pp.552-557
- Publisher
- England
- DOI
- 10.1177/0309364615605372
- PMID
- 26423107
- ISSN
- 0309-3646
- eISSN
- 1746-1553
- Language
- English
- Date published
- 10/2016
- Academic Unit
- Physical Therapy and Rehabilitation Science
- Record Identifier
- 9984047681602771
Metrics
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