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Original ArticleOpen Access
Efficacy of Symptomatic Control of Knee Osteoarthritis with 0.0125% of Capsaicin Versus Placebo
Kosuwon W 
,
Sirichatiwapee W ,
Wisanuyotin T ,
Jeeravipoolvarn P ,
Laupattarakasem W
,
Sirichatiwapee W ,
Wisanuyotin T ,
Jeeravipoolvarn P ,
Laupattarakasem W Background: Knee osteoarthritis (OA) is prevalent and associated with both pain and functional disability. Current treatments
aim to alleviate mild to moderate symptoms by various methods. Topical capsaicin (0.075% and 0.05%) has been evaluated
for the treatment of the painful joints. A burning sensation was the most common side effect at these strengths. Therefore, the
authors aimed to evaluate the efficacy of 0.0125% capsaicin gel (Capsika gel) compared to a placebo (the vehicle gel) in
patients with symptomatic OA knee.
Material and Method: This was a cross-over, double blinded, randomized, controlled trial of 100 patients with mild to
moderate knee OA. All of the patients received either capsaicin gel or placebo gel applied to the affected knee, three times daily
for 4 weeks with one week washout period after which the treatment switched to either capsaicin gel or placebo gel for the next
4 weeks. A blinded examiner used the visual analog scale (VAS) and WOMAC score to do weekly assessments.
Results: Subjects averaged 61 years of age (range, 44 to 82). During the enrollment phase, only female farmers presented.
Mean body weight and height was 62.97 + 10.25 kg and 1.54 + 0.053 m, respectively. The respective baseline VAS and
WOMAC score was 6.40 + 1.64 and 51.65 + 13.3. The severity of OA, according to the KL criteria was: 83 patients with
grade 2 and 16 with grade 3.The respective mean difference of VAS and total WOMAC score in the capsaicin group vs. the
placebo group was statistically significant (p < 0.05). The mean difference of the WOMAC pain, stiffness and functional
subscales in the capsaicin vs. the placebo group was also significant (p < 0.05). The only adverse event reported was a
burning sensation. During the 4-week treatment with capsaicin, ~67% of patients had a burning sensation but none withdrew
for this reason.
Conclusion: 0.0125% capsaicin gel was an effective treatment in mildly to moderately painful OA knees. The burning
sensation reported by patients in the capsaicin group was less disturbing than in previous studies and none of the present
patients withdrew for this reason.
Keywords: 0.0125% capsaicin gel, OA knee
aim to alleviate mild to moderate symptoms by various methods. Topical capsaicin (0.075% and 0.05%) has been evaluated
for the treatment of the painful joints. A burning sensation was the most common side effect at these strengths. Therefore, the
authors aimed to evaluate the efficacy of 0.0125% capsaicin gel (Capsika gel) compared to a placebo (the vehicle gel) in
patients with symptomatic OA knee.
Material and Method: This was a cross-over, double blinded, randomized, controlled trial of 100 patients with mild to
moderate knee OA. All of the patients received either capsaicin gel or placebo gel applied to the affected knee, three times daily
for 4 weeks with one week washout period after which the treatment switched to either capsaicin gel or placebo gel for the next
4 weeks. A blinded examiner used the visual analog scale (VAS) and WOMAC score to do weekly assessments.
Results: Subjects averaged 61 years of age (range, 44 to 82). During the enrollment phase, only female farmers presented.
Mean body weight and height was 62.97 + 10.25 kg and 1.54 + 0.053 m, respectively. The respective baseline VAS and
WOMAC score was 6.40 + 1.64 and 51.65 + 13.3. The severity of OA, according to the KL criteria was: 83 patients with
grade 2 and 16 with grade 3.The respective mean difference of VAS and total WOMAC score in the capsaicin group vs. the
placebo group was statistically significant (p < 0.05). The mean difference of the WOMAC pain, stiffness and functional
subscales in the capsaicin vs. the placebo group was also significant (p < 0.05). The only adverse event reported was a
burning sensation. During the 4-week treatment with capsaicin, ~67% of patients had a burning sensation but none withdrew
for this reason.
Conclusion: 0.0125% capsaicin gel was an effective treatment in mildly to moderately painful OA knees. The burning
sensation reported by patients in the capsaicin group was less disturbing than in previous studies and none of the present
patients withdrew for this reason.
Keywords: 0.0125% capsaicin gel, OA knee
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