The behind the knee test was developed to assess the frictional effect and mechanical irritant properties of hygiene products that contact specialized skin areas such as the vulva. Test materials are applied daily to the area behind the knee and held in place for six hours by an elastic knee band. Irritation is graded 30 to 60 minutes after test product removal, preferably in the afternoon, and the following morning before the application of the next sample, using the four-point visual scoring system. It was found that two applications of six hours each on intact skin were sufficient to determine the irritant quality of a product. Depending on what type of product and/or reaction is being examined, one can use dry product on intact skin, dry product on compromised (tape stripped) skin, wet product on intact skin, or wet product on compromised skin. There may also be an association between the subject's reported sensory effects, such as pain, burning, or stinging, and the degree of irritation seen on objective scoring (14,17).
Was this article helpful?
Rosacea and Eczema are two skin conditions that are fairly commonly found throughout the world. Each of them is characterized by different features, and can be both discomfiting as well as result in undesirable appearance features. In a nutshell, theyre problems that many would want to deal with.