Comparison of Impar Ganglion Block and Sacral Erector Spinae Plane Block in Patients with Coccygodynia

March 19, 2025 updated by: Tuba Tanyel Saraçoğlu, Başakşehir Çam & Sakura City Hospital

Comparison of Impar Ganglion Block and Sacral Erector Spinae Plane Block for Chronic Coccygodynia: a Randomized Controlled Trial

Coccygodynia is a condition that causes pain in the tailbone (coccyx) area. While it can develop after trauma, such as a fall or fracture, in some cases, no clear cause is identified. Patients who do not experience relief from standard treatments like pain medications, physical therapy, and posture adjustments may be referred to specialized pain management clinics for further treatment options.

Several interventional procedures can help manage coccygodynia. These include impar ganglion block, radiofrequency ablation, caudal epidural steroid injections, sacral erector spinae plane (ESP) block, and coccygeal nerve blocks. These procedures are commonly performed in pain treatment centers and aim to reduce discomfort by targeting specific nerves responsible for transmitting pain signals.

Impar ganglion block is one of the most frequently used treatments for coccygodynia. It involves injecting a local anesthetic, with or without steroids, into a small nerve cluster in front of the sacrococcygeal joint. This procedure is performed under ultrasound and/or fluoroscopic (X-ray) guidance in a sterile operating room setting to ensure accuracy and safety. While the goal is to relieve pain, potential risks include temporary worsening of pain, bleeding, infection, or, in rare cases, rectal injury.

Another interventional option is the sacral erector spinae plane (ESP) block, a technique that delivers local anesthetic under the erector spinae muscles in the sacrum. This procedure, also performed under ultrasound guidance in a sterile environment, is used to block pain signals from the coccyx and surrounding areas. Like the impar ganglion block, it can be effective for pain relief, but possible side effects include temporary pain increase, bleeding, and infection at the injection site.

Both procedures are minimally invasive.

Study Overview

Detailed Description

Coccygodynia is defined as pain localized in the coccygeal region. While previous trauma and fractures may contribute to its development, in many cases, no identifiable etiology can be determined. Patients who continue to experience pain despite conservative treatment and physiotherapy are often referred to pain management outpatient clinics for interventional treatment options. Various interventional procedures are utilized in the management of coccygodynia, including impar ganglion block and radiofrequency applications, caudal epidural steroid injections, sacral erector spinae plane block, and coccygeal nerve blocks, all of which are commonly performed in pain treatment clinics. Impar ganglion block is administered under sterile conditions in the sacrococcygeal region within an operating room setting, utilizing ultrasound and/or fluoroscopic guidance. This procedure aims to alleviate pain; however, potential complications include increased pain, bleeding at the procedural site, rectal perforation, and infection. Sacral erector spinae plane block is another interventional approach performed under sterile conditions in the operating room using ultrasound guidance. Similar to the impar ganglion block, its primary objective is pain reduction, though it also carries risks such as increased pain, bleeding, and infection at the procedural site

Study Type

Interventional

Enrollment (Estimated)

130

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

    • Başakşehir
      • İstanbul, Başakşehir, Turkey
        • Recruiting
        • Başakşehir Çam and Sakura City Hospital
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Those who have had chronic coccygodynia for at least 3 months
  • Being between the ages of 18-65
  • Patients who do not respond to conservative treatments (analgesics, physical therapy modalities etc.) and are scheduled for interventional pain procedures

Exclusion Criteria:

  • Patients who have undergone surgery to the coccyx region
  • Having undergone an interventional pain procedure in the lumbar, sacral and coccyx regions within the last year
  • Patients with systemic infection, local infection at the application site, and coagulopathy
  • Pregnant and breastfeeding patients
  • Having endocrine or rheumatological disease that may affect the musculoskeletal system in the relevant region and lead to diagnostic complexity (such as spondyloarthropathy)
  • Patients with musculoskeletal system pathology that may contribute to symptoms in the relevant region and affect the evaluation of treatment results (such as lumbar disc herniation, sacroiliitis, spinal stenosis)
  • Those with lumbar, sacral or coccygeal vertebra fractures
  • Those with a history of allergic reactions to the contents of the injectate to be administered during an interventional pain procedure (especially contrast agent and local anesthetic)
  • Those with mental disorders that may affect the evaluation during the follow-up periods during the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Ganglion İmpar Block Group
Participants in this group will performed ganglion impar block
Block of the ganglion impar is performed by injecting a mixture of steroid and local anaesthetic in front of the sacrococcygeal joint. This procedure is performed in a sterile operating theatre under ultrasound and/or fluoroscopic (X-ray) guidance. Radiopaque agents are also used during the procedure to confirm the location.
Other Names:
  • impar block
Active Comparator: Sacral Erector Spinae Plane Block
Participants in this group will performed sacral erector spinae plane block
The sacral erector spina plan block is performed with ultrasound guidance by injecting a high volume mixture of local anaesthetic and steroid into the fascia under the erector spina muscles in the sacral region.
Other Names:
  • Sacral multifidus plane block

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Numeric Rating Scale
Time Frame: Preprocedural, Week 1, Week 4, Week 12
The Numeric Rating Scale (NRS) is an 11-point scale (0-10) used to assess pain intensity, with 0 indicating 'no pain' and 10 representing 'worst possible pain.
Preprocedural, Week 1, Week 4, Week 12

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Short Form-12
Time Frame: Preprocedural, Week 1, Week 4, Week 12
The Short Form-12 (SF-12) is a validated questionnaire assessing health-related quality of life. It generates separate Physical Component Summary (PCS) and Mental Component Summary (MCS) scores, where higher scores indicate better physical and mental health, while lower scores reflect poorer health status.
Preprocedural, Week 1, Week 4, Week 12
Pain-free sitting duration
Time Frame: Preprocedural, Week 1, Week 4, Week 12
Patients will be asked to assess and record their pain-free sitting durations on the hard and soft surfaces they regularly use during pre-procedural and post-procedural follow-ups. They will be specifically instructed to perform these assessments using the same hard and soft surfaces each time.
Preprocedural, Week 1, Week 4, Week 12
Oswetry Disability Index
Time Frame: Preprocedural, Week 1, Week 4, Week 12
The Oswestry Disability Index (ODI) was used to assess the degree of disability. The ODI consists of 10 items, evaluating pain intensity, personal care, lifting, walking, sitting, standing, social life, sleeping, traveling, and pain-related distress.
Preprocedural, Week 1, Week 4, Week 12

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Investigators

  • Principal Investigator: Tuba Tanyel Saraçoğlu, Başakşehir Çam & Sakura City Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

March 15, 2025

Primary Completion (Estimated)

August 15, 2025

Study Completion (Estimated)

October 15, 2025

Study Registration Dates

First Submitted

February 28, 2025

First Submitted That Met QC Criteria

February 28, 2025

First Posted (Actual)

March 25, 2025

Study Record Updates

Last Update Posted (Actual)

March 25, 2025

Last Update Submitted That Met QC Criteria

March 19, 2025

Last Verified

February 1, 2025

More Information

Terms related to this study

Other Study ID Numbers

  • 22.05.2024.01

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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