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Transtibial Prosthetic Socket Design and Suspension Mechanism: A Literature Review (JPO031-4B)
Journal of Prosthetics and Orthotics: Volume 31, Issue 4
Introduction: The body weight of the prosthetic user is supported and distributed by the prosthetic socket during the stance phase of gait. Throughout swing phase, inertial forces (pressure and shear) are exerted by the socket suspension mechanism onto the residuum to facilitate suspension. Objectives in the study were to identify and investigate available evidence in transtibial (TT) socket design and suspension to highlight the most effective weight transfer mechanisms and suspension techniques.
Methods: A literature research was conducted comprising two parts: socket design and suspension. Boolean search terms and truncation were used using relevant keywords in online search engines to obtain precise results.Results: Seventeen articles that met inclusion criteria were reviewed.
Conclusions: A conclusion on whether socket preference is due to the suspension mechanism or socket design itself cannot be drawn. Patellar tendon bearing (PTB) sockets are still successfully used and, in some studies, preferred over total surface bearing (TSB) sockets. Biomechanically, however, TSB sockets allow for a more even weight distribution when combined with suction, particularly vacuum-assisted socket suspension (VASS). Some limited evidence exists to support that such designs may have some effect on wound healing and early ambulation. Further research must be conducted to standardize acclimation periods. Crossover randomized controlled trials with larger sample sizes are required to establish an evidence base to improve clinical practice. (J Prosthet Orthot. 2019;31:224–245)
Credit
CEU:2.0
Author(s)
Nadhira Al Shuaili, Bsc (Hons); Navid Aslani, PhD; Lynsey Duff, Bsc (Hons); Anthony McGarry, PhD
Description
Lower-limb amputation is a challenging consequence of diabetes and dysvascular disease. The incidence of transtibial (TT) amputation has reduced in the United Kingdom; however, it remains the most common amputation level according to the latest statistics. After amputation, function and cosmesis are replaced by an unnatural biomechanical device: the prosthesis. TT prostheses consist of four main parts: the prosthetic socket and its interface, suspension mechanism, pylon, and foot.