• Yajing Chen, Qiang Zhu, Bing Huang, Qianying Liu, Qiuli He, Yibing Yao, Kang An, Chunyan Zhu, Wei Chen, and Ming Yao.
• Bengbu Medical College, Bengbu, Anhui Province, China; First Affiliated Hospital of Jiaxing University, Jiaxing, Zhejiang Province, China.
• Pain Physician. 2019 Jul 1; 22 (4): 377-387.

BackgroundPercutaneous infrazygomatic radiofrequency (PIR) is a common approach used to block isolated maxillary nerve (V2) pain through the foramen rotundum (FR) in patients with trigeminal neuralgia (TN). Nevertheless, when using this method, there is a risk of accidental penetration of the superior orbital fissure (SOF) and the optic canal (OC) that may result in the injury of the vessels and nerves in that area, and in some severe cases may lead to blindness. According to the blocking of the external orifice of the FR and whether a curved needle was used, combined angle deviation from the path of percutaneous infrazygomatic approach, the FR to the SOF or the OC in the treatment of V2 pain, in which no research has reported the angle, we analyzed the value and application of personalized needle modification in PIR in isolated maxillary nerve pain through the FR.ObjectivesThe following study examined the relationship between the FR and the SOF, and analyzed the clinical significance of personalized needle modification in computed tomography (CT)-guided PIR ablation of the maxillary nerve through the FR in patients with TN.Study DesignRandomized, review, clinical research study.SettingDepartment of Anesthesiology and Pain Medical Center, Jiaxing, China.MethodsThree-dimensional reconstruction was performed in 88 patients and 136 patients with PIR ablation in isolated maxillary nerve pain through the FR. According to the blocking of the external orifice of the FR and whether a curved needle was used, patients were divided into 4 groups: curved-needle blocking group (CB), straight-needle blocking group (SB), straight needle no-blocking group (SN), and curved-needle no-blocking group (CN).ResultsThe results obtained revealed minimum H (shortest diameter of the FR) = 1.0 mm and minimum L (length of the FR tubes) = 3.7 mm. The distance between the external orifice of the FR and the SOF (FS) was 5.16 ± 1.33 mm. The angle A (between the radiofrequency needle and the sagittal plane) was 39 ± 3.95°; the angle between the canthomeatal line and the CT scan line (ACT) was 58.99 ± 6.23°; the puncture depth (LS) was 63.99 ± 4.24 mm; the deviation angle of the misplacement into the SOF (SAF) was 2.96 ± 0.71°; the deviation angle of the misplacement into the OC (OAF) was 4.95 ± 0.73°. In addition, the postoperative Numeric Rating Scale scores in the CB group were significantly lower compared with the SB group, whereas the probability of entering the SOF in the CB group was significantly lower compared with the SB group. The total number of punctures in the SN group was less than that in the CN group.LimitationsAdditional clinical data should be collected to preserve the results in future work.ConclusionsThe distance between the FR and the SOF or the OC was only few millimeters, and slight angle error could lead to the SOF and the OC. For patients with blockage in the path, the treatment of radiofrequency with personalized needle modification could improve the curative effect and reduce the risk of accidental SOF penetration.Key WordsTrigeminal neuralgia, foramen rotundum, superior orbital fissure, radiofrequency, personalized needle modification.

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