Int J Med Robot - A pre-operative approach of range of motion simulation and verification for femoroacetabular impingement.

Tópicos

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Resumo

CKGROUND: Femoroacetabular impingement (FAI) is increasingly recognized as a potential cause of hip osteoarthritis. A system capable of pre-operatively simulating hip range of motion (ROM) by given surface models from either healthy or FAI diseased bone is desirable.METHODS: An impingement detection system using bounding sphere hierarchies was first developed. Both precision and accuracy of the impingement detection system were verified by a custom-designed phantom to imitate ball-and-socket hip movement. The impingement detection system was then implemented into the hip ROM simulation system to simulate the ROM of (1) healthy pelvis and femur, and (2) healthy pelvis and pathologic femur. The ROM simulation system was also verified by manipulating sawbones under the navigation of an optical tracking system.RESULTS: The impingement detection system achieved a distance error of 0.53 ? 0.06 mm and an angular error of 0.28 ? 0.03?. The impingement detection accuracies were 100%, 100%, and 96% in three different phantom orientations, respectively. The mean errors between simulated and verified ROM were 0.10 ? 1.39? for the 'healthy pelvis and femur' group, and - 2.38 ? 3.49? for the 'healthy pelvis and pathologic femur' group.CONCLUSION: The present study demonstrates a pre-operative approach to virtually simulate and predict the functional hip ROM based on the given bone models. The impingement detection and ROM simulation systems developed may also be used for other orthopedic applications.

Resumo Limpo

ckground femoroacetabular imping fai increas recogn potenti caus hip osteoarthr system capabl preoper simul hip rang motion rom given surfac model either healthi fai diseas bone desirablemethod imping detect system use bound sphere hierarchi first develop precis accuraci imping detect system verifi customdesign phantom imit ballandsocket hip movement imping detect system implement hip rom simul system simul rom healthi pelvi femur healthi pelvi patholog femur rom simul system also verifi manipul sawbon navig optic track systemresult imping detect system achiev distanc error mm angular error imping detect accuraci three differ phantom orient respect mean error simul verifi rom healthi pelvi femur group healthi pelvi patholog femur groupconclus present studi demonstr preoper approach virtual simul predict function hip rom base given bone model imping detect rom simul system develop may also use orthoped applic

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