What is the purpose of the Hubsher Maneuver, also known as Jack's Test?

• A. To assess the range of motion in the ankle
• B. To measure the flexibility of a pes cavus
• C. To diagnose flatfoot in children
• D. To evaluate the stability of the knee joint

Answer: (B)

The Hubsher Maneuver, commonly referred to as Jack's Test, is specifically designed to measure the flexibility of a pes cavus. This test involves bringing the forefoot into a position of dorsiflexion while the subtalar joint is plantarflexed. The goal is to observe how the arch behaves under these conditions, indicating whether it is a flexible or rigid pes cavus.

In individuals with a flexible pes cavus, the arch may lower when the forefoot is loaded through this maneuver, demonstrating the adaptability of the foot structure. Conversely, a rigid pes cavus will not show this lowerable arch, which is indicative of a structural deformity rather than one that can flex. This differentiation is crucial for treatment decisions and understanding the underlying mechanics of the foot.

Other options, while related to foot examination, do not pertain to the specific purpose of Jack's Test. The assessment of ankle range of motion, diagnosis of flatfoot in children, and evaluation of knee joint stability each focus on different aspects of musculoskeletal assessment, which are not the focus of the Hubsher Maneuver.