Which condition describes the decreased angle of the femur's head and neck to its axis?

Coxa Vara is characterized by a decreased angle between the femoral neck and the femoral shaft, which is typically less than the normal range of 125-135 degrees. In coxa vara, the angle is reduced, which can lead to changes in gait mechanics and potentially result in an altered distribution of forces across the hip joint. This condition can lead to various symptoms such as hip pain or restrict mobility, as it modifies the biomechanical alignment of the hip.

In contrast, coxa valga represents an increase in this angle, leading to a wider positioning of the femoral head relative to the shaft, which may also influence hip function but in the opposite manner. Genu valgum (knock-knees) and genu varum (bowlegs) pertain to angular deformities of the knee rather than the femur and are thus unrelated to the question focusing specifically on the femoral neck angle.