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Efficacy Study on Symptomatic Control of Patient With Knee Osteoarthritis Between 0.0125% of Capsaicin to Placebo (OAknee)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00471055
Recruitment Status : Completed
First Posted : May 9, 2007
Last Update Posted : July 9, 2008
Bangkok Laboratories and Cosmetics
Information provided by:
Khon Kaen University

Brief Summary:
The purpose of this study is to determine whether capsaicin gel is effective in treating mild to moderate degrees of osteoarthritis of the knee in the elderly patient compared with placebo gel.

Condition or disease Intervention/treatment Phase
Osteoarthritis, Knee Joint Capsicum Drug: 0.0125% Capsaicin gel "CAPSIKA gel" Drug: Placebo Phase 3

Detailed Description:
Osteoarthritis (OA) is the most common form of arthritis in the population. It is characterized pathologically by both focal loss of articular cartilage and marginal and central new bone formation. OA of knee, the principal large joint to be affected, results in disabling knee symptoms in an estimated 10% of people older than 55 years, a quarter of whom are severely disabled. The risk of disability attributable to knee OA alone is as great as that due to cardiac disease and greater than that due to any other medical disorder in the elderly. A recent World Health Organization report on the global burden of disease indicates that knee OA is likely to become the fourth most important global cause of disability in women and the eighth most important in men. Knee OA is associated with symptoms of pain and functional disability. Physical disability arising from pain and loss of functional capacity reduces quality of life and increases the risk of further morbidity and mortality. Current treatments aim at alleviating these symptoms of mild to moderate OA by several different methods: non-pharmacological treatment (for example education, exercise, lifestyle changes) or pharmacological treatments(for example paracetamol, NSAIDs and Capsaicin gel topical treatments). Current evidence to support the various treatments in current use, however, is very variable. Capsaicin, the active principle of hot chili pepper, is thought to selectively stimulate unmyelinated C fibre afferent neurons and cause the release of substance P. Prolonged application of capsaicin reversibly depletes stores of substance P, and possibly other neurotransmitters, from sensory nerve endings. This reduces or abolishes the transmission of painful stimuli from the peripheral nerve fibres to the higher centres.There were many study on Capsaicin gel to confirm the effectiveness of capsaicin gel in many dosages. However, there has been no efficacy study on the capsaicin 0.0125% of the Thai produce "Capsika gel " before, therefore, this study is proposed.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 100 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Efficacy Study on Symptomatic Control of Patient With Knee Osteoarthritis Between 0.0125% of Capsaicin to Placebo
Study Start Date : June 2007
Actual Primary Completion Date : October 2007
Actual Study Completion Date : December 2007

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Osteoarthritis
Drug Information available for: Capsaicin

Arm Intervention/treatment
Experimental: A
Capsaicin and placebo controlled,Cross-over design study
Drug: 0.0125% Capsaicin gel "CAPSIKA gel"
Placebo Comparator: B
Capsaicin and placebo controlled,Cross-over design study
Drug: Placebo

Primary Outcome Measures :
  1. VAS and WOMAC [ Time Frame: 8 months ]
  2. VAS and WOMAC [ Time Frame: 8-month study ]

Information from the National Library of Medicine

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Ages Eligible for Study:   40 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

Subjects eligible for enrollment in the study must meet all of the following criteria:

  1. Subjects who are capable of giving written informed consent, which includes compliance with the requirements and restrictions listed in the consent form.
  2. Ambulatory nom pregnant females and males 40-<80 years of age.
  3. Subjects who withdraw pain medication or nutritional supplements for symptom relief for knee OA for a total of at least 15 days before screening visit 0.
  4. Pain at or below 80 mm on a 100 mm VAS in the index knee.
  5. A documented diagnosis of OA of the knee, or meeting American College of Rheumatology (ACR) clinical criteria for classification of idiopathic (primary) OA for at least 6 months prior to screening. If OA is presented in both knees the investigator will identify which knee will be X-rayed for study entry, with preference for the knee with more severe pain (<80mm VAS).
  6. Has documented radiographic evidence of OA of the knee from the screening Visit radiograph of grade 2 or 3 according to Kellgren and Lawrence Radiographic Grading.
  7. Subjects with baseline minimum joint space width in the medial compartment of the index knee of > 1.5 mm at Baseline, measured from radiographs using the MTP view.
  8. Subjects with baseline minimum joint space width in the lateral compartment of the index knee of > 2.5 mm at Baseline, measured from radiographs using the MTP view.
  9. Subject is able to understand and complete pain/function, global arthritis evaluation, and health outcome assessment.

Exclusion Criteria:

Subjects with any of the following criteria must not be enrolled in the study:

  1. Subjects with history of hypersensitivity to capsaicin.
  2. Subjects with skin lesion at the index knee.
  3. A history of lower extremity surgery within 6 months prior to screening V0.
  4. Significant prior injury to the index knee within 12 months prior to screening V0.
  5. Disease of the spine or other lower extremity joints of sufficient degree to affect the index knee.
  6. Treatment with other drugs potentially affecting bone or cartilage metabolism as described below:

    • chronic systematic corticosteroids
    • hyaluronan injection into the index knee with in the previous 6 months.
    • Diacerin treatment within the last 12 months.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00471055

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Weerachai Kosuwon
Khon kaen University, Khon Kaen, Thailand, 40002
Sponsors and Collaborators
Khon Kaen University
Bangkok Laboratories and Cosmetics
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Principal Investigator: weerachai Kosuwon, M.D Department of Orthopedics, Faculty of Medicine, Khon kaen University
Layout table for additonal information Identifier: NCT00471055    
Other Study ID Numbers: Khonkaen-ortho 1
First Posted: May 9, 2007    Key Record Dates
Last Update Posted: July 9, 2008
Last Verified: April 2008
Keywords provided by Khon Kaen University:
capsaicin gel
Additional relevant MeSH terms:
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Osteoarthritis, Knee
Joint Diseases
Musculoskeletal Diseases
Rheumatic Diseases
Dermatologic Agents
Sensory System Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs