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Presentation of the three flexiblity parameters of L4/5 and the relationship between a modified grading system on degenerative disk disease based on 1. radiographs, 1.1 AP/lateral position (Mimura-score), 1.2 oblique position (Pathria-score) and 2. patho-anatomic criteria, 2.1 macrsocopic findings (Nachemson-score), 2.2 microscopic findings (Vernon-Roberts-score)
