Comparison of in vivo measured loads in knee,hip and spinal implants during level walking |
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| Institution: | 1. Department of Mechanical and Materials Engineering, Queen’s University, McLaughlin Hall, Kingston, Ontario K7L 3N6, Canada;2. Department of Mechanical Engineering, University of Wisconsin, 1513 University Ave, Madison, WI 53706, USA;1. Department of Orthopedic Surgery, McLaren-Greater Lansing Hospital, Lansing, MI, USA;2. Department of Osteopathic Surgical Specialties, Michigan State University, East Lansing, MI, USA;3. Department of Orthopedic Surgery, Sparrow Hospital, Lansing, MI, USA;4. Michigan State University Center for Orthopedic Research, East Lansing, MI, USA;1. Julius Wolff Institute for Biomechanics and Musculoskeletal Regeneration, Charité – University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany;2. BG Trauma Center, Eberhard Karls University Tübingen, Schnarrenbergstraße 95, Tübingen, Germany;3. Centre for Musculoskeletal Surgery, Charité – University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany;1. Aesculap AG Research & Development, Tuttlingen, Germany;2. Ludwig Maximilians University Munich, Department of Orthopaedic Surgery, Physical Medicine & Rehabilitation, Campus Grosshadern, Munich, Germany;3. Julius Wolff Institute, Charité Universitätsmedizin Berlin, Germany;1. Trauma and Orthopaedic Surgeon, Southport and Ormskirk NHS Trust, Southport, PR8 6PN, UK;2. Clinical Fellow in Trauma and Orthopaedics, Health Education East Midlands, Leicester, LE3 5DR, UK;3. Department of Orthopaedics, Atal Bihari Vajpayee Institute of Medical Sciences, Dr Ram Manohar Lohia Hospital, New Delhi, 110001, India;4. Consultant Orthopaedic, Foot and Ankle Surgeon, King''s College Hospital NHS Foundation Trust, Denmark Hill, London, SE5 9RS, UK;5. Consultant Musculoskeletal Radiologist, Royal Orthopaedic Hospital, Birmingham, B31 2AP, UK;6. Department of Orthopaedics, Indraprastha Apollo Hospital, Sarita Vihar, Mathura Road, 110076, New Delhi, India |
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| Abstract: | Walking is a task that we seek to understand because it is the most relevant human locomotion. Walking causes complex loading patterns and high load magnitudes within the human body. This work summarizes partially published load data collected in earlier in vivo measurement studies on 9 patients with telemeterized knee endoprostheses, 10 with hip endoprostheses and 5 with vertebral body replacements. Moreover, for the 19 endoprosthesis patients, additional simultaneously measured and previously unreported ground reaction forces are presented.The ground reaction force and the implant forces in the knee and hip exhibited a double peak during each step. The maxima of the ground reaction forces ranged from 100% to 126% bodyweight. In comparison, the greatest implant forces in the hip (249% bodyweight) and knee (271% bodyweight) were much greater. The mean peak force measured in the vertebral body replacement was 39% bodyweight and occurred at different time points of the stance phase.We concluded that walking leads to high load magnitudes in the knee and hip, whereas the forces in the vertebral body replacement remained relatively low. This indicates that the first peak force was greater in the hip than in the knee joint while this was reversed for the second peak force. The forces in the spinal implant were considerably lower than in the knee and hip joints. |
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| Keywords: | Walking Hip joint Knee joint Spinal loads Telemetry Ground reaction force |
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