MUSCLE UNBALANCE INFLUENCE TO HIP IMPLANT MIGRATION

Abstract eng:
In general all orthopaedic operations may cause the change of muscle balance. This unbalance various not only range of movement but also the loading vector during the movement. In case of hemiarthroplasty when the new joint is created by femoral replacement and intact acetabulum could be the unbalance very dangerous. Migration of the implant head after hemiarthoplasty is the problem which is observed to nearly at all patients. Muscle unbalance and shape of acetabulum are the two main problems solved by numerical analysis of hip joint FE model. The paper deals with numerical analysis of hip joint surgery that effects changes of acetabulum stress field and implant migration in acetabulum area. Pelvic bone geometry was obtained from computer tomography by semiautomatic generation. The numerical analysis compares shapes and peak values of stress field in acetabulum area. Ultimate values of first principal stress, third principal stress and total displacements were used as reference magnitudes and confront with after-surgery exploration.

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