Patient specific parametric geometric modelling of cementless hip prosthesis

Total hip replacement is a surgical procedure to replace a diseased or injured hip by a prosthetic implant. Though the geometry of commercially available implants has been standardized, due to changes in biological features, the available choice of implant may not be the best-fit for a particular patient's hip joint. The present work aims at creating a framework for subject specific femoral implant design. Initially a set of prespecified femoral features that can be used for custom implant design have been identified for this study based on interaction and discussion with orthopaedic surgeons. The identified features are extracted from the femur geometry reconstructed from computed tomography images. A parametric implant design is proposed based on the extracted femur features. The framework has been implemented in SolidWorks® using its application programming interface. An example case study is presented to demonstrate and validate the framework and its implementation. © 2012 Taylor & Francis Group, London.