St. John's Wort Oil on Osteoarthritis

Not Applicable

Completed

• Conditions: Pain; Osteoarthritis, Knee
• Interventions: Other: locally applied to the skin

• Registration Number: NCT05663996
• Lead Sponsor: TC Erciyes University

Brief Summary

This study investigated the effect of St. John's Wort oil on pain intensity and physical functions in people with knee osteoarthritis. This study adopted a randomized, placebo-controlled, and qualitative mixed design. The sample consisted of 60 patients randomized into intervention (n=30) and placebo control (n=30) groups. The experimental group participants were treated with St. John's Wort oil three times a week for three weeks, while the placebo control group participants were treated with olive oil three times a week for three weeks. Quantitative data were collected using a patient identification form, the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), and the Visual Analogue Scale (VAS). Qualitative data were collected through semi-structured interviews. .

Detailed Description

This study adopted a randomized, placebo-controlled, and qualitative mixed design. Qualitative data were collected using a semi-structured interview questionnaire.

The study was conducted in the physical therapy and rehabilitation outpatient clinic of a public hospital in Türkiye. The study population consisted of all patients admitted to the outpatient clinic for osteoarthritis-related pain. The data collection process continued from December 2017 to August 2018 and was reported in accordance with the Consolidated Standards of Reporting Trials (CONSORT) guidelines. A pilot study was conducted with five patients before data collection.

Patients diagnosed with osteoarthritis by a physical therapy and rehabilitation specialist according to ACR criteria were randomized into the study by the University Biostatistics Unit. The initial sample consisted of 72 patients divided into intervention (n=36; St. John's wort oil) and placebo control (n=36; olive oil) groups. However, six experimental group participants were excluded because they either could not be contacted on the phone during the follow-ups (n=4) or stated that they would be out of town for a long time (n=2). Six control group participants were also excluded because they either could not be contacted on the phone during the follow-ups (n=3), did not want to keep up with the intervention (n=1), or wanted to withdraw from the study (n=2). Therefore, the final sample consisted of 30 experimental and 30 control group participants.

Study Timeline

• Study Start: 2017-12-25
• Primary Completion: 2018-08-06
• Study Completion: 2018-08-06
• Status Verified: 2022-12
• Study First Submitted: 2022-12-02
• Study First Submitted QC: 2022-12-15
• Last Update Submitted: 2022-12-15
• Study First Posted: 2022-12-23
• Last Update Posted: 2022-12-23

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 60

Inclusion Criteria

• being literate,
• planning no pregnancy during the study,
• not being pregnant,
• having been diagnosed with knee osteoarthritis according to ACR (American College of Rheumatology),
• having had knee pain for the past month,
• needing analgesics for more than 15 days in a month,
• having osteoarthritis-related knee pain despite routine treatment with analgesics,
• having a VAS score of ≥ 4 on one knee,
• speaking Turkish,
• having no communication problems, and
• volunteering

Exclusion Criteria

• Pregnant,
• Having a physical disability in the area where the application will be made,
• Having any skin disease in the area to be treated,
• Having large scar tissue in the area to be treated,
• Having a history of physical trauma in the last three months in the area to be treated,
• Having any peripheral vascular disease in the area to be treated,
• Having inflammatory joint disease,
• Having a history of rheumatoid arthritis and fibromyalgia,
• Using any complementary and integrative (integrated) health application in the last three months,
• Those who have undergone intra-articular treatment in the last three months,
• Receiving pain blocking treatment in the last year,
• Receiving physical therapy in the last three months and during the application,
• Patients with 2 or more pain in the other knee according to the VAS scale were not included in the study.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Olive Oil	locally applied to the skin	Control group participants were treated with olive oil.
St. John's Wort oil	locally applied to the skin	Experimental group participants were treated with St. John's Wort oil.

Primary Outcome Measures

Name	Time	Method
WOMAC Scale	Change from baseline score at the end of the third week	The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) is a health status scale assessing osteoarthritis-related disability. WOMAC was developed (1982) and revised (1998) by Bellamy et al. The index consists of 24 items rated on a five-point Likert-type scale. The index has three subscales: pain (five items), stiffness (two items), and physical function (17 items). WOMAC can detect significant health status changes following various pharmacological, surgical, and physical therapy interventions. The instrument has been adapted into many languages. The total score of the "pain" subscale ranges from 0 to 20. The total score of the "stiffness" subscale ranges from 0 to 8. The total score of the "physical function" subscale ranges from 0 to 68. Higher scores indicate more symptoms and physical limitations.
Visual Analog Scale	change in baseline scores at the end of the third week.	The Visual Analog Scale was developed by Price et al. (1983). It is an easy-to-use and reliable scale used to convert some values that cannot be measured numerically into numbers. The VAS is a 10 cm long horizontal or vertical line with anchor statements "no pain or pain at its least" at the left-most end and "unbearable pain or worst pain imaginable" at the right-most end. The participant marks a point on the line that best represents their pain level. The distance of the mark to the left end is measured with a ruler. This distance, usually measured in millimeters, is reported and recorded as "points.

Trial Locations

Locations (1)

Osmaniye Korkut Ata University; 🇹🇷 Osmaniye, Turkey