Apparatus for monitoring load bearing rehabilitation exercises of a transfemoral amputee fitted with an osseointegrated fixation: A proof-of-concept study |
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| Authors: | Laurent Frossard David Lee Gow Kerstin Hagberg Nicola Cairns Bill Contoyannis Steven Gray Richard Brånemark Mark Pearcy |
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| Affiliation: | 1. School of Engineering Systems, Queensland University of Technology, Brisbane, Australia;2. Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia;3. Centre for Health Innovation and Solutions, The University of Queensland, Brisbane, Australia;4. Caulfield General Medical Centre, Melbourne, Australia;5. Centre of Orthopaedic Osseointegration, Sahlgrenska University Hospital, Göteborg, Australia;6. RehabTech, Monash Rehabilitation Technology Research Unit, Melbourne, Australia;7. Plastic Surgery Unit/Osseointegration OPRA Programme, The Alfred Hospital, Melbourne, Australia;1. Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL, United States;2. Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, United States;1. Ottawa Hospital Research Institute, 725 Parkdale Avenue, Ottawa, ON K1Y 4E9, Canada;2. University of Ottawa, Department of Mechanical Engineering, 161 Louis Pasteur, Ottawa, ON K1N 6N5, Canada;3. Canadian Forces Health Services, 1745 Alta Vista Drive, Ottawa, ON K1A 0K6, Canada;4. University of Ottawa, Faculty of Medicine, 451 Smyth Road, Ottawa, ON K1H 8M5, Canada;5. Glenrose Rehabilitation Hospital, Alberta Health Services, 10230 111 Avenue NW, Edmonton, AB T5G 0B7, Canada;6. University of Alberta, 116 Street and 85 Avenue, Edmonton, AB T6G 2R3, Canada;1. Department of Orthopaedics, The First Central Hospital of Tianjin, N24 Fu Kang Road, NanKai District, Tianjin 300192, China;2. Department of Mechanical Engineering Sciences University of Surrey, Guildford, Surrey GU2 7XH, UK;1. Department of Rehabilitation Medicine, University of Washington, Seattle, WA;2. Research Department, Miami Veterans Affairs Healthcare System, Miami, FL;3. Department of Physical Therapy, University of Miami Miller School of Medicine, Coral Gables, FL |
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| Abstract: | The purpose of this proof-of-concept study was to determine the relevance of direct measurements to monitor the load applied on the osseointegrated fixation of transfemoral amputees during static load bearing exercises. The objectives were (A) to introduce an apparatus using a three-dimensional load transducer, (B) to present a range of derived information relevant to clinicians, (C) to report on the outcomes of a pilot study and (D) to compare the measurements from the transducer with those from the current method using a weighing scale. One transfemoral amputee fitted with an osseointegrated implant was asked to apply 10 kg, 20 kg, 40 kg and 80 kg on the fixation, using self-monitoring with the weighing scale. The loading was directly measured with a portable kinetic system including a six-channel transducer, external interface circuitry and a laptop. As the load prescribed increased from 10 kg to 80 kg, the forces and moments applied on and around the antero-posterior axis increased by four-fold anteriorly and 14-fold medially, respectively. The forces and moments applied on and around the medio-lateral axis increased by nine-fold laterally and 16-fold from anterior to posterior, respectively. The long axis of the fixation was overloaded and underloaded in 17% and 83% of the trials, respectively, by up to ±10%. This proof-of-concept study presents an apparatus that can be used by clinicians facing the challenge of improving basic knowledge on osseointegration, for the design of equipment for load bearing exercises and for rehabilitation programs. |
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