Which test assesses the dynamic medial longitudinal arch collapse of the foot?

Which test assesses the dynamic medial longitudinal arch collapse of the foot?

• A. Navicular drop test
• B. Thompson test
• C. Syndesmosis squeeze test
• D. Anterior drawer test

Answer: (A)

The main concept is assessing how much the medial longitudinal arch collapses under load. The navicular drop test does this by measuring the navicular tuberosity’s height from the floor in a nonweight-bearing position and then again in a weight-bearing position. The difference between these two measurements shows how much the arch drops when the foot bears weight; a larger drop indicates dynamic arch collapse or flexible flatfoot. This test specifically targets the arch’s function under load, unlike the others: the Thompson test checks Achilles tendon integrity, the syndesmosis squeeze test assesses the distal tibiofibular ligaments, and the anterior drawer test evaluates ankle joint laxity, not the arch height under load.

The main concept is assessing how much the medial longitudinal arch collapses under load. The navicular drop test does this by measuring the navicular tuberosity’s height from the floor in a nonweight-bearing position and then again in a weight-bearing position. The difference between these two measurements shows how much the arch drops when the foot bears weight; a larger drop indicates dynamic arch collapse or flexible flatfoot. This test specifically targets the arch’s function under load, unlike the others: the Thompson test checks Achilles tendon integrity, the syndesmosis squeeze test assesses the distal tibiofibular ligaments, and the anterior drawer test evaluates ankle joint laxity, not the arch height under load.