Methods Inf Med - Automatic joint alignment measurements in pre- and post-operative long leg standing radiographs.

Tópicos

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Resumo

JECTIVES: For diagnosis or treatment assessment of knee joint osteoarthritis it is required to measure bone morphometry from radiographic images. We propose a method for automatic measurement of joint alignment from pre-operative as well as post-operative radiographs.METHODS: In a two step approach we first detect and segment any implants or other artificial objects within the image. We exploit physical characteristics and avoid prior shape information to cope with the vast amount of implant types. Subsequently, we exploit the implant delineations to adapt the initialization and adaptation phase of a dedicated bone segmentation scheme using deformable template models. Implant and bone contours are fused to derive the final joint segmentation and thus the alignment measurements.RESULTS: We evaluated our method on clinical long leg radiographs and compared both the initialization rate, corresponding to the number of images successfully processed by the proposed algorithm, and the accuracy of the alignment measurement. Ground truth has been generated by an experienced orthopedic surgeon. For comparison a second reader reevaluated the measurements. Experiments on two sets of 70 and 120 digital radiographs show that 92% of the joints could be processed automatically and the derived measurements of the automatic method are comparable to a human reader for pre-operative as well as post-operative images with a typical error of 0.7? and correlations of r = 0.82 to r = 0.99 with the ground truth.CONCLUSIONS: The proposed method allows deriving objective measures of joint alignment from clinical radiographs. Its accuracy and precision are on par with a human reader for all evaluated measurements.

Resumo Limpo

jectiv diagnosi treatment assess knee joint osteoarthr requir measur bone morphometri radiograph imag propos method automat measur joint align preoper well postop radiographsmethod two step approach first detect segment implant artifici object within imag exploit physic characterist avoid prior shape inform cope vast amount implant type subsequ exploit implant delin adapt initi adapt phase dedic bone segment scheme use deform templat model implant bone contour fuse deriv final joint segment thus align measurementsresult evalu method clinic long leg radiograph compar initi rate correspond number imag success process propos algorithm accuraci align measur ground truth generat experienc orthoped surgeon comparison second reader reevalu measur experi two set digit radiograph show joint process automat deriv measur automat method compar human reader preoper well postop imag typic error correl r r ground truthconclus propos method allow deriv object measur joint align clinic radiograph accuraci precis par human reader evalu measur

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