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Clinical Trial Examining the Short and Long-term Effect of Myofascial Trigger Points Injection in Low Back Pain Patients

This study has been completed.
Information provided by (Responsible Party):
Dr. Yoram Shir, McGill University Health Center Identifier:
First received: January 11, 2012
Last updated: July 26, 2013
Last verified: July 2013
The objective of this study is to examine the short and long-term effect of myofascial trigger point injections with either a local anesthetic or saline in patients with chronic low back pain presenting with myofasical pain syndrome.

Condition Intervention Phase
Low Back Pain
Drug: Bupivacaine
Drug: Saline
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Investigator)
Primary Purpose: Treatment
Official Title: A Prospective, Randomized, Double-blind, Clinical Trial of Trigger Point Injection Therapy for the Treatment of Myofascial Pain Syndrome

Resource links provided by NLM:

Further study details as provided by McGill University Health Center:

Primary Outcome Measures:
  • Pressure pain threshold of the myofascial trigger points [ Time Frame: 12 weeks ]
    Change in the pressure pain threshold will be measured using a pressure algometer.

Secondary Outcome Measures:
  • Pressure pain threshold of MTPs [ Time Frame: baseline, 4 weeks, 8 weeks ]
    Change in the pressure pain threshold of MTPs after each MTP injection.

  • VAS Low Back Pain [ Time Frame: baseline, 4 weeks, 8 weeks, 12 weeks ]
    Change in pain intensity after each MTPI and at the end of the study.

  • Roland-Morris Disability Questionnaire (RDQ-20) [ Time Frame: baseline, 4 weeks, 8 weeks, 12 weeks ]
    Change in disability levels after each MTPI and at the end of the study.

  • Short-Form Health Status Survey 12 (SF-12) [ Time Frame: baseline, 4 weeks, 8 weeks, 12 weeks ]
    Change in functional status, well-being and quality of life after each MTPI and at the end of the study.

  • Consumption of analgesic medications [ Time Frame: 12 weeks ]
    Change in the consumption of analgesic medications.

  • Number of participants with Adverse Events [ Time Frame: 12 weeks ]
    Adverse events resulting from the intervention.

Enrollment: 40
Study Start Date: January 2012
Study Completion Date: July 2013
Primary Completion Date: June 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: bupivacaine Drug: Bupivacaine
2ml per injection up to a maximum of 8ml (4 identified trigger points) per visit
Other Name: lidocaine
Placebo Comparator: saline Drug: Saline
2ml per injection up to a maximum of 8ml (4 identified trigger points) per visit


Ages Eligible for Study:   18 Years to 75 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • CLBP of non-malignant origin, with or without accompanying leg pain, including patients with history of previous back surgery or trauma
  • MPS as evident by at least one active MTP, located medial or lateral to the posterior iliac crest involving the gluteus maximus or medius, quadratus lumborum and erector spinae muscles
  • While not precluding the participation in the study, MTP in other areas will not make patients eligible
  • Pain lasting for at least six months

Exclusion Criteria:

  • Any current motor weakness, but not sensory loss or abnormal reflexes in the lower limbs
  • Any injection or nerve block in the low back in the last 6 months
  • Local or systemic infection
  • Bleeding disorder or the use of anticoagulation medications
  • Known allergy to local anesthetics
  • Poor understanding of written and spoken English or French
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01520415

Canada, Quebec
Alan Edwards Pain Management Unit - Montreal General Hospital
Montreal, Quebec, Canada, H3G 1A4
Sponsors and Collaborators
Dr. Yoram Shir
Principal Investigator: Yoram Shir, MD MUHC-RI
  More Information

Responsible Party: Dr. Yoram Shir, Doctor, McGill University Health Center Identifier: NCT01520415     History of Changes
Other Study ID Numbers: AEPMU-01
Study First Received: January 11, 2012
Last Updated: July 26, 2013

Additional relevant MeSH terms:
Back Pain
Low Back Pain
Myofascial Pain Syndromes
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms
Muscular Diseases
Musculoskeletal Diseases
Anesthetics, Local
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents processed this record on May 24, 2017