Figure 4 Planning of the approach and the needle route. (a) Preliminary axial CT image shows measurement of the distance between the proposed puncture site and the midline, as well as the depth and the angulation to targeted biopsy site in L5 vertebral body. (b) Axial CT fluoroscopic image taken with the patient lying prone shows the Ostycut needle inserted into the same vertebral body via the right transpedicular route.

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