Int J Comput Assist Radiol Surg - Analysis of the micro-migration of sliding hip screws by using point-based registration.

Tópicos

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Resumo

RPOSE: The favored treatment for many hip fractures is a sliding hip screw, and its usage is expected to increase in the future. Failures can be reduced, and complications detected earlier by semi-automated CT image analysis. The most frequent failure is due to the screw cut-out from the femoral head.METHODS: An image-based method was developed for early detection of complications and assessment of anchorage quality relative to implant model, bone quality or tip-apex distance (TAD). This method evaluates micro-migration using CT images acquired at different time points (immediately post-op and 3-month later). Serial CT image registration and transformation methods were applied, including point-based registration, to achieve semi-automated evaluations.RESULTS: Qualitative and quantitative validation of the image registration was performed with measurement mean error determination by different observers. The micro-migration evaluation by clinicians compared favorably with semi-automated image-based results.CONCLUSION: Semi-automatic evaluation of hip screw micro-migration using CT images is feasible and can aid observation of convalescence. The method may be amenable to full automation, a future goal for this work.

Resumo Limpo

rpose favor treatment mani hip fractur slide hip screw usag expect increas futur failur can reduc complic detect earlier semiautom ct imag analysi frequent failur due screw cutout femor headmethod imagebas method develop earli detect complic assess anchorag qualiti relat implant model bone qualiti tipapex distanc tad method evalu micromigr use ct imag acquir differ time point immedi postop month later serial ct imag registr transform method appli includ pointbas registr achiev semiautom evaluationsresult qualit quantit valid imag registr perform measur mean error determin differ observ micromigr evalu clinician compar favor semiautom imagebas resultsconclus semiautomat evalu hip screw micromigr use ct imag feasibl can aid observ convalesc method may amen full autom futur goal work

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