What angular threshold is used to define genu varum?

What angular threshold is used to define genu varum?

• A. <180
• B. 180-190
• C. >180
• D. 160-170

Answer: (C)

In this context, the angle used to judge knee alignment is the tibiofemoral angle measured on a full-leg radiograph. A neutral alignment sits at about 180 degrees. When the leg bows outward, the distal segment shifts medially and the angle becomes obtuse, crossing past 180 degrees. So genu varum is defined by an angle greater than 180 degrees. Measurements are typically taken with the knee in full extension using the femoral and tibial axes. Angles at or below 180 degrees correspond to neutral or valgus deformities, not varus.

In this context, the angle used to judge knee alignment is the tibiofemoral angle measured on a full-leg radiograph. A neutral alignment sits at about 180 degrees. When the leg bows outward, the distal segment shifts medially and the angle becomes obtuse, crossing past 180 degrees. So genu varum is defined by an angle greater than 180 degrees. Measurements are typically taken with the knee in full extension using the femoral and tibial axes. Angles at or below 180 degrees correspond to neutral or valgus deformities, not varus.