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To assess the variable “Ostophyte Formation”, the two anterior (e1, e2), two posterior (e3, e4), two right lateral (e5, e6) and two left lateral edges (e7, e8) of the adjacent vertebral bodies are screened for osteophytes. Their number is counted and their length is measured along their long axis beginning at the former border of the vertebral body and ending at their tips (white lines in the edges e1, e2, e5, e6, e7 and e8)
