Kambin’s Triangle Approach of Lumbar Transforaminal Epidural Injection with Spinal Stenosis
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Objective To compare the short-term effect and advantage of transforaminal epidural steroid injection (TFESI)performed using the Kambin’s triangle and subpedicular approaches. Method Forty-two patients with radicular pain from lumbar spinal stenosis were enrolled. Subjects were randomly assigned to one of two groups. All procedures were performed using C-arm KMC 950. Th e frequency of complications during the procedure and the effect of TFESI at 2 and 4 weeks after the procedure between the two groups were compared. Short-term outcomes were measured using a visual numeric scale (VNS) and a five-grade scale. Multiple logistic regression analyses were performed to evaluate the relationship between possible outcome predictors (Kambin’s triangle or subpedicular approach, age, duration of symptoms and sex) and the therapeutic effect. Results VNS was improved 2 weeks after the injection and continued to improve until 4 weeks in both groups. There were no statistical diff erences in changes of VNS, effectiveness and contrast spread pattern between these two groups. No correlation was found between the other variables tested and therapeutic effect. Spinal nerve pricking occurred in five cases of the subpedicular and in none of the cases of the Kambin’s triangle approach (p<0.05). Conclusion The Kambin’s triangle approach is as efficacious as the subpedicular approach for short-term effect and offers considerable advantages (i.e., less spinal nerve pricking during procedure). The Kambin’s triangle approach maybe an alternative method for transforaminal epidural steroid injection in cases where needle tip positioning in the anterior epidural space is difficult.
Abstract
Objective To compare the short-term effect and advantage of transforaminal epidural steroid injection (TFESI)performed using the Kambin’s triangle and subpedicular approaches. Method Forty-two patients with radicular pain from lumbar spinal stenosis were enrolled. Subjects were randomly assigned to one of two groups. All procedures were performed using C-arm KMC 950. Th e frequency of complications during the procedure and the effect of TFESI at 2 and 4 weeks after the procedure between the two groups were compared. Short-term outcomes were measured using a visual numeric scale (VNS) and a five-grade scale. Multiple logistic regression analyses were performed to evaluate the relationship between possible outcome predictors (Kambin’s triangle or subpedicular approach, age, duration of symptoms and sex) and the therapeutic effect. Results VNS was improved 2 weeks after the injection and continued to improve until 4 weeks in both groups. There were no statistical diff erences in changes of VNS, effectiveness and contrast spread pattern between these two groups. No correlation was found between the other variables tested and therapeutic effect. Spinal nerve pricking occurred in five cases of the subpedicular and in none of the cases of the Kambin’s triangle approach (p<0.05). Conclusion The Kambin’s triangle approach is as efficacious as the subpedicular approach for short-term effect and offers considerable advantages (i.e., less spinal nerve pricking during procedure). The Kambin’s triangle approach maybe an alternative method for transforaminal epidural steroid injection in cases where needle tip positioning in the anterior epidural space is difficult.
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