What angle characterizes coxa vara?

Coxa vara is a condition characterized by a decreased angle between the neck and the shaft of the femur, which is known as the femoral neck-shaft angle. Typically, this angle is around 125 degrees in a normal hip joint. When the angle measures less than 120 degrees, this indicates coxa vara.

The condition can lead to a variety of functional impairments in the hip, including altered gait mechanics and increased risk of hip joint issues. In evaluating the options, a less than 120-degree femoral neck-shaft angle aligns precisely with the definition of coxa vara, affirming choice B as the most accurate response.