Received: 2014/06/24 | Accepted: 2014/08/26 | Published: 2014/12/16
URL: http://ijwph.ir/article-1-423-en.html
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2- Rehabilitation Department, Rehabilitation Sciences Faculty, Iran University of Medical Sciences, Tehran, Iran
3- Biomedical Engineering Department, Engineering Faculty, Malaya University, Kuala Lampur, Malaysia
Aims: Below the
knee amputation is the most common of lower limb amputations. The suspension system of the below the knee prostheses,
is an important component of
it. The aim of this study was
to compare the piston movement of two types of prostheses including "conventional
supracondylar PTB" and "supracondylar PTB with pneumatic
suspension" in the unilateral below the knee amputee.
Patient & Methods: This simple quasi-experimental study was done in the Rehabilitation
Clinic of Orthotics and Prosthetics Department of Iran Rehabilitation Sciences
School, inviting the unilateral below the knee amputee in 2014. After
air-cushion designing and manufacturing process, the piston movement of a
conventional supracondylar PTB prostheses and supracondylar PTB prosthesis with
pneumatic suspension was measured using imaging and markers in 4-step constant
loading test including full weight bearing, semi-weight bearing, non-weight
bearing and the 30N loading.
Findings: The
mean vertical movement of the markers in conventional prostheses in non-weight
bearing was ±15mm, whereas this value decreased in the
pneumatic prostheses (5±mm). The mean vertical movement of the markers following 3kg loading in the
conventional prostheses was 20±mm while it decreased in the pneumatic
prostheses (10±mm).
Conclusion: Piston
movement decreased using the supracondylar PTB prostheses with pneumatic
suspension.