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Meralgia paresthetica is characterized by compression of the lateral femoral cutaneous nerve, which leads to sensory disturbances in the thigh. The correct clinical feature to evaluate in this condition is the sensation of the lateral aspect of the thigh. This area corresponds to the distribution of the lateral femoral cutaneous nerve, which primarily provides sensation to the skin on the outer side of the thigh.

By assessing the sensation in this area, a therapist can determine if there is a loss of sensation, tingling, or pain, which are common symptoms associated with meralgia paresthetica. Evaluating this sensory function is critical in establishing a diagnosis and understanding the extent of nerve involvement.

The other options focus on the strength of specific muscles or sensory evaluation in regions not affected by meralgia paresthetica. Evaluating muscle strength in the adductor longus or quadriceps femoris does not directly relate to the changes in sensation experienced by the patient. Similarly, assessing sensation of the superior medial aspect of the thigh is not relevant for meralgia paresthetica, as this area is not affected by the lateral femoral cutaneous nerve.