Identification of the critical level of implantation of an osseointegrated prosthesis for above-knee amputees |
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Authors: | Elder Michael Andrango Castro Svatava Konvickova Matej Daniel Zdenek Horak |
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Affiliation: | 1. Department of Mechanics, Biomechanics and Mechatronics, Faculty of Mechanical Engineering, Czech Technical University in Prague, Prague, Czech Republic;2. Department of Technical Studies, College of Polytechnics Jihlava, Jihlava, Czech Republic |
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Abstract: | The aim of our study was to identify potential critical levels of implantation of an osseointegrated prosthesis for above-knee amputees. The implant used was the OPRA system. It was inserted in the femur at four different amputation heights, characterized by their residual limb ratios (0.299, 0.44, 0.58 and 0.73). The stress and strain distribution was evaluated in the bone-implant system during walking, considering a body mass of 100 kg. Considerably high stimulus (11,489 με) in the tissue near the tip was found at the highest implantation level. All models presented small non-physiologic stress values in the tissue around the implant. The results revealed that the implantation level has a decisive effect on bone-implant performance. Mainly, the analysis indicates adverse biomechanical conditions for implantations in very short residual limbs. |
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Keywords: | Critical implantation level osseointegrated prosthesis above-knee amputees residual limb length OPRA system finite element analysis |
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