PMC6937524_01
(Left) Sagittal imaging before treatment showed C1/2 vertical subluxation (Ranawat index of 1.18 cm, normal range: 1.5 cm), ankylosis of the C2/3 facet joint, osteophytic lipping of the cervical vertebrae, especially at C4 to C6 levels, narrowing of the C3 prevertebral soft-tissue contour (hollow arrow), Cobb angle of 28  (normal range: 20 -35 ) and forward misalignment as measured by the increase of C2 to C7 sagittal vertical alignment (SVA 3.85 cm, normal range <2.13 cm). (Right) In the third month after treatment initiation, the parameters of cervical morphology, including cervical spine curvature, prevertebral soft-tissue contours, Cobb angle, Ranawat index, and C2 to C7 SVA were all improved.
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PMC6937524_01_10.1177_1179547619882707-fig1.jpg
fig1-1179547619882707
Imaging studies (Figure 1, left) revealed Ranawat index of 1.18 cm (normal reference >1.5 cm), ankylosis of the C2/3 facet joint, osteophytic lipping of the cervical vertebrae, especially at C4 to C6 levels, narrowing of the C3 prevertebral soft-tissue contour (hollow arrow), and forward misalignment as measured by increased C2 to C7 sagittal vertical alignment (SVA). Radiographs were repeated after treatment completion, parameters of the cervical morphology, including cervical curvature, Cobb angle, Ranawat index, and C2 to C7 vertical alignment were all improved (Figure 1, right).