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Fig. 1 | BMC Musculoskeletal Disorders

Fig. 1

From: Epidemiology of ossification of the spinal ligaments and associated factors in the Chinese population: a cross-sectional study of 2000 consecutive individuals

Fig. 1

Sagittal radiologic parameters and examples of each type of OSL on whole spine computed tomography. a Measurement methods for CL, TK, LL, SS, and SVA. b A 50-year-old man had OPLL (red arrow), OLF (yellow arrow), and OALL (white arrow). c A 70-year-old man had OLF (yellow arrow), DISH (white arrow), and ONL (green arrow). Abbreviations: CL, cervical lordosis; TK, thoracic kyphosis; LL, lumbar lordosis; SS, sacral slope; SVA, sagittal vertical axis; OPLL, ossification of the posterior longitudinal ligament; OLF, ossification of the ligamentum flavum; OALL, ossification of the anterior longitudinal ligament; DISH, diffuse idiopathic skeletal hyperostosis; ONL, ossification of the nuchal ligament

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