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. 2015 Jan 16;14:6. doi: 10.1186/1475-925X-14-6

Figure 1.

Figure 1

Examples of AOs classes of the cervical x-ray images. Samples of Macnab’s classification and their osteophyte severity grading in the cervical vertebrae x-ray images, (a) normal (b) moderate traction (c) severe claw and (d) slight claw-traction.