Treatment of large lumbar disc herniation with percutaneous ozone injection via the posterior-lateral route and inner margin of the facet joint

Figure 1 The placement of the needle tip measured accurately by Dyna-CT reconstruction under rotary digital subtraction angiography (DSA). A: The needle advanced into the disc through the inner margin of the facet joint and the needle tip was placed in the hernia under Dyna-CT cross-sectional reconstruction; B: The needle tip advanced into the disc through the posterior-lateral route under Dyna-CT sagittal reconstruction.