Four-channel telemetry system for in vivo measurement of hip joint forces |
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| Institution: | 1. Department of Industrial Engineering, University of Padova, Italy;2. Centre for Mechanics of Biological Materials, University of Padova, Italy;3. Department of Biomedical Sciences, University of Padova, Italy;1. Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A.;2. Department of Orthopedic Surgery, Loma Linda University Medical Center, Loma Linda, California, U.S.A.;1. Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI, USA;2. Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, MO, USA;3. Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI, USA;4. Department of Mechanical Engineering, Michigan State University, East Lansing, MI, USA;1. Department of Orthopaedic Surgery, University Hospitals Cleveland Medical Center, Cleveland, Ohio, U.S.A.;2. Case Western Reserve University School of Medicine, Cleveland, Ohio, U.S.A.;3. MedStar Union Memorial Orthopaedics, Baltimore, Maryland, U.S.A.;1. Department of Orthopedic Surgery, Chugoku Rousai Hospital, Kure, Hiroshima, Japan;2. Department of Orthopaedic Surgery, Hiroshima University, Hiroshima, Japan |
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| Abstract: | The long-term loosening of artificial hip joints remains a serious clinical problem. Optimization of implant design and material will improve the fixation, but it requires a detailed knowledge of the forces which act on the implant. A four-channel telemetric transmitter was developed and arranged completely inside a hermetically closed artificial hip joint. This permits long term in vivo measurements of the three-dimensional forces without endangering the patient. The external telemetry system consists of an inductive power supply, an RF receiver, a microcomputer with hardware extension and a VHS video system. The personal computer offers real-time data processing of three orthogonal force components as well as slow motion analysis of recorded measurements. After several years of animal tests, two instrumented prostheses were implanted in the first patient (male) in May and August of 1988. In March 1990 a third prosthesis was implanted in a second patient (female). Joint force measurements have regularly been performed from the first post-operative day until now for several kinds of activity. |
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