18 February 2024: Clinical Research
Vertical Relationship Ratio (VRR): A High Reliability and Accuracy Radiographic Measurement for Basilar Invagination in Rheumatoid Arthritis
Monchai Ruangchainikom 1ABDEF , Ekkapoj Korwutthikulrangsri 1E , Apisit Rattanatanasarn 1C , Ishthayapong Kanjanakeereewong 1C , Win Boonsirikamchai 2C , Panlop Tirawanish 3C , Surin Thanapipatsiri 1A , Werasak Sutipornpalangkul 1ADE*DOI: 10.12659/MSM.943329
Med Sci Monit 2024; 30:e943329
Figure 1 The measurement method of the Vertical Relationship Ratio (VRR): D/H, D: The distance between the midpoint of the base of C2 and a line from the center of the anterior and posterior arch of C1, H: mean of vertebral body height of C3 ((Anterior vertebral height+posterior vertebral height)/2). The figure was created using PowerPoint for Windows version 2311, Microsoft Corporation (Redmond, WA, USA).