Coxa vara and coxa valga are abnormalities of the femoral shaft-to-neck angle. The normal angle is ≈150 degrees at birth, decreasing to 120 to 135 degrees in adults. Coxa vara occurs when the angle is less than 120 degrees and may be secondary to trauma, tumor, SCFE, or a congenital abnormality. Coxa valga occurs when the angle is greater than 135 degrees and is usually neuromuscular in origin but may also be seen in blood dyscrasias such as thalassemia.
Coxa vara and coxa valga
