Which type of whirlpool would NOT allow full extension of a lower extremity in a hydrotherapy tank?

The highboy tank is designed for hydrotherapy where the water is deeper, allowing for aquatic exercises that can submerge the torso and lower extremities. However, the dimensions of the highboy tank may limit the ability to achieve full extension of the lower extremities, as the water level is typically high enough to support the body but not conducive to movements requiring full extension, especially for taller patients.

In contrast, the Hubbard tank, lowboy tank, and walk tank are structured in ways that better accommodate full extension of the lower extremities. The Hubbard tank is very spacious and allows for a range of movements, while the lowboy tank is specifically designed to support lower extremity exercises with sufficient depth for full extension. The walk tank is also designed to facilitate mobility and full range of motion for lower extremities.

Therefore, the highboy tank is the type that would not allow for full extension of a lower extremity, making it the correct answer.