Physical Therapy Assistant Practice Exam

When using the Semmes-Weinstein monofilament in sensory testing, an expected outcome is the deformation of the monofilament into a "C" shape at the point of application to the skin. This occurs when sufficient force is applied to bend the monofilament, indicating that a sensory response has been elicited. The test primarily aims to assess the integrity of the light touch and protective sensation in patients—particularly those at risk for diabetic neuropathy or other conditions affecting sensory perception.

Detecting the monofilament's bending is crucial, as it confirms that the sensory receptors in the skin are functioning properly. This deformation not only signifies that the pressure threshold has been met but also allows the clinician to determine the sensitivity of the patient's skin in specific areas, which can guide further assessment and intervention in a rehabilitation setting.