Abstract
Abstract The paper introduces a method for the automated generation of patient-specific instruments (PSI), here in particular templates, for the implantation of customized implants. The basis is the derivation of data from the morphology of the bony situation and the medical planning. A developed methodological approach based on an Active Shape Model (ASM) is used for the morphological measurement. Determined geometric dimensions are placed on this ASM and automatically adjusted in each case. In addition, specially developed software tools for the planning and design of medical devices will be presented. This includes, among other things, the intuitive control of template parameters by the user when manual adjustments are necessary. The determined data is bundled and applied to previously methodically thought-out and categorized master CAD (Computer Aided Design) models of surgical templates. These master models are fully configurable and designed to be adjusted within defined ranges of values. The templates are printed from the biocompatible material PA12 using selective laser sintering (SLS).
Highlights
Knee joint implants individually adapted to the patient are advantageous with regard to an exact fit in terms of size, shape and function
Studies show for total knee arthroplasty (TKA) that up to 19% of patients treated with conventional TKA complain of residual symptoms such as pain, functional limitations in certain activities of daily living, or postoperative complication requiring readmission to the hospital. [2, 3]
Appropriate software tools are necessary for digital planning and modeling based on the patient's computed tomography (CT) data to ensure optimal treatment of the patient
Summary
Knee joint implants individually adapted to the patient are advantageous with regard to an exact fit in terms of size, shape and function. Quality and durability have been improved over the last two decades to such an extent that implant survival rates of over 90% after ten or more years are no longer unusual [2]. Despite this improvement, patient satisfaction has not followed this development to the same extent. It is obvious to extend the process for developing patient-specific knee joint implants by automatically generating individual surgical templates followed by additive manufacturing
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