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Dimethyl sulfoxide

Biomechanical effects on tendons

Fort Collins Sports Medicine Clinic, Fort Collins, Colorado

John S. Harvey, JR, MD

Fort Collins Sports Medicine Clinic, Fort Collins, Colorado

Forty-eight mice were treated for 12 time periods from 0 days through 28 days at 24-hour intervals by rinsing the skin area of the Achilles tendon of each hindleg with 100 µl of a solution of 70% drug grade dimethyl sulfoxide in 30% sterile water. After the treatment period the mice were killed and the Achilles tendons were subjected to separation force analysis to determine tensile strength. The mean separation force was shown to be a function of the treatment pe riod (P = 0.0294) with a significant linear compo nent (P = 0.0049), a significant quadratic com ponent (P = 0.0036), and a significant cubic compo nent (P = 0.0049). The model identified an initial area of decreasing mean separation force (0 to 7 days), an area of increasing mean separation force (7 to 22 days), and a subsequent area of decreasing mean separation force (22 to 28 days). The maximum de crease in the group mean separation force was 20.2% and was observed in the 7-day treatment group. The clinical significance of the results of this study was that the topical application of dimethyl sulfoxide was associated with periods of decreased mean separa tion forces in tendons. The avoidance of vigorous muscular activity is recommended during therapy with dimethyl sulfoxide.

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