Comprehensive Analysis Of Socket-type And Osseointegrated Lower-limb Prostheses - Advancing Forward To Improve Comfort, Safety And Walking Ability | QUT ePrints QUT Home Contact Home Browse About Login Comprehensive Analysis Of Socket-type And Osseointegrated Lower-limb Prostheses - Advancing Forward To Improve Comfort, Safety And Walking Ability Lee, Winson, Frossard, Laurent, & Zhang, Ming (2006) Comprehensive Analysis Of Socket-type And Osseointegrated Lower-limb Prostheses - Advancing Forward To Improve Comfort, Safety And Walking Ability. In 2006 Joint Local Symposium, 2006-05-08 - 2006-05-08. Description Introduction There are at least 3 million people globally who need prosthetic treatment. A lower-limb prosthesis is conventionally attached to the residual limb by a socket and/or some suspension devices. Although this approach has been used for over 50 years, previous studies have pointed the phenomena that residual limb pain, gait deviation and prosthetic structural failure are common. Poor socket fit, rigid ankle joint and improper prothesis design are the main causes of the problems. On the other hand, a few teams are developing a surgical approach for directly connecting a prosthesis into the femur using a titanium implant (osseointegration). The advantages are improved comfort and sensory feedback, and greater hip range of motion. However, occasional mechanical failure of fixation is probably one major downside aspect of this surgical procedure. There is a need for analysis and further improvement in both conventional and osseointegrated prostheses. This article presents a series of our two studies on socket-type and osseointegrated prostheses. Methods Socket-type prostheses: A step-to-step method was used to design and evaluate a particular prosthesis type- monolimb- a low-cost trans-tibial prosthesis with the socket and shank moulded into one piece of thermoplastic. Taguchi method and computational modelling were used to optimize the design of a monolimb giving appropriate overall flexibility and structural integrity. Finite element modelling was used to study the effect of flexibility on socket-limb interface stress, which is believed to be related to comfort of the use of socket-type, prostheses. Experimental fatigue test was performed upon repeated loading. Gait tests were performed comparing the optimized flexible monolimb to conventional "rigid" prostheses. Osseointegration: Load applied on the fixation was monitored by a transducer when the transfemoral amputees walked in a straight line. Twelve participants were involved, representing about 15% of the global population fitted with lower-limb osseointegrated fixations. Step-tostep and subject-to-subject variability in load were studied. Temporal gait parameters were studied from the force-time data obtained by the transducer. The temporal parameters were compared with amputees using socket-type prostheses and non-amputees. Results An optimized shank design for a monolimb was suggested. Increased overall prosthesis flexibility tends to reduce socket-limb interface stress. Fatigue test showed there is no visual necking of material after 500,000 cycles of load. Gait tests suggested the optimized monolimb gave amputees better comfort and gait performance- offering similar functional advantages to the some commercialized high-cost prosthetic components. Three-dimensional forces and moments of each participant fitted with osseointegrated prostheses during normal walking were revealed. Variations of load between steps and among subjects were quantified. Cadence of the amputees fitted with osseointegrated fixations were found lower than the nonamputees, but in the range of amputees using socket-type prostheses. Discussion and Conclusions Using appropriate computational and experimental approaches, socket-type and osseointegrated prostheses were analysed and designed. Initial success in the socket-type prosthesis design, and the collection of crucial information for osseointegrated prostheses was achieved. Further investigations, such as field test of monolimbs, study of the impact of a given parameter on loading, and mechanical design of osseointegrated fixations are necessary. Impact and interest: Search Google Scholar™ Citation counts are sourced monthly from Scopus and Web of Science® citation databases. These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards. Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search. Notify us of incorrect data How to use citation counts More information More statistics... ID Code: 4165 Item Type: Contribution to conference (Abstract) Refereed: No Measurements or Duration: 0 Keywords: Comfort, Osseointegrated Prosthesis, Safety, Socket-type Prosthesis, Walking Ability Pure ID: 33839781 Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering ?? 1409 ?? Current > QUT Faculties and Divisions > Faculty of Health Current > Schools > School of Exercise & Nutrition Sciences Current > Institutes > Institute of Health and Biomedical Innovation Current > QUT Faculties and Divisions > Science & Engineering Faculty ?? 32 - ?? Copyright Owner: Consult author(s) regarding copyright matters Copyright Statement: This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au Deposited On: 17 May 2006 00:00 Last Modified: 07 Jan 2021 14:51 Export: EndNote | Dublin Core | BibTeX Repository Staff Only: item control page Home Browse research About CRICOS No. 00213J ABN 83 791 724 622 Accessibility Copyright Disclaimer Privacy Right to Information
