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Biomechanics of limb prostheses directly attached to bone

Newcombe, Lindsay Kathleen; (2009) Biomechanics of limb prostheses directly attached to bone. Doctoral thesis , UCL (University College London). Green open access

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The technique of attaching a limb directly to the skeleton has clear benefits, when compared with socket-attachment, for the many amputees who encounter skin problems. A potential risk of attaching a limb to the skeleton is the wound where the implant breaches the skin. At the Centre for Biomedical Engineering in the Institute of Orthopaedics and Musculoskeletal Science at UCL, a method has been devised which enhances epithelial attachment to the implant, resisting infection, and this has been used to develop a system for attaching a limb to the skeleton: Intraosseous Transcutaneous Amputation Prosthesis, or ITAP. In a transfemoral prosthesis, protection of bone from external loading is anticipated and in this thesis a fail-safe component is designed to prevent fracture. It has adjustable activation levels and has been tested to the appropriate International Standards. In order to determine loads that are to be allowed and prevented, normal loading of the femur during ordinary activities is researched failure modes of femoral bone are investigated. Finite element analysis is employed to investigate the stress distribution throughout the femur with the attachment of a prosthetic leg. A cylindrical model is used to assess the effect of varying geometry and material properties of the bone and implant. An anatomical model, derived from a CT scan, is used to analyse the effect of stump length. There are three risk groups that the amputee can be allocated depending on the level of amputation, the size of the bone, and the amount of bone contact with the implant. At the beginning of rehabilitation the fail-safe is set low to protect the poorer bone and bone-implant interface. The settings are gradually increased during rehabilitation to 60Nm, 80Nm or 100Nm in bending and 10Nm, 15Nm and 25Nm in torsion for high, medium and low risk amputees respectively.

Type: Thesis (Doctoral)
Title: Biomechanics of limb prostheses directly attached to bone
Identifier: PQ ETD:591259
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Thesis digitised by ProQuest. Third party copyright material has been removed from the ethesis. Images identifying individuals have been redacted or partially redacted to protect their identity.
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1443994
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