What is femoral anteversion?
Femoral anteversion is an inward twisting of the thigh bone, also known as the femur (the bone that is located between the hip and the knee). Femoral anteversion causes the child’s knees and feet to turn inward, or have what is also known as a “pigeon-toed” appearance.
What is femoral retroversion?
Femoral retroversion (also known as hip retroversion) is a rotational or torsional deformity in which the femur (thighbone) twists backward (outward) in relation to the knee. Because the lower part of the femur is connected to the knee, this also means that the knee is twisted outward relative to the hip.
How do you calculate femoral anteversion?
Measure the Condyle-Horizontal Angle (CH). Calculate the angle of the Neck relative to the Condyles (NC=NH-CH). ←For the example to the left, the Neck-Horizontal angle=30°, the Condyle-Horizontal=10°, thus the relative angle between the Femoral Neck and Condyles =20°. This is the Femoral Anteversion angle.
What is the angle of anteversion retroversion?
Femoral neck anteversion angle is typically symmetrical from the left side to the right side. 5. In contrast to FNA, femoral neck retroversion is present when the head and neck of the femur are angled less than the average FNA angle (15°–20°) along the frontal plane of the body (Fig.
How is hip retroversion treated?
As the underlying problem with acetabular retroversion is one of the hip joint being malpositioned, it may require correction with surgery. Having an acetabular retroversion treatment may involve either arthroscopic trimming of the bone, or osteotomy (cutting the pelvis and realigning it).
What is a normal femoral anteversion angle?
Femoral anteversion averages between 30-40° at birth, and between 8-14° in adults 1, with males having a slightly less femoral anteversion than females 2.
What is anteversion of the pelvis?
Also called hip anteversion, femoral anteversion is a forward (inward) rotation in the femur (thighbone), which connects to the pelvis to form the hip joint. In other words the knee is excessively twisted inward relative to the hip. Femoral anteversion can occur in one or both legs.
Does femoral anteversion cause knock knees?
This shape causes intoeing (sometimes called pigeon-toed) and knock knees. This can be seen in a child as early as when the child begins to walk and sometimes becomes more obvious as they grow.
How common is femoral retroversion?
The prevalence of femoral retroversion was higher in hips with SCFE for the proximal methods of Lee et al. and Reikerås et al. (91% [95% CI 85% to 97%] and 84% [95% CI 76% to 92%], respectively) than for the distal measurement methods of Tomczak et al.
Why does femoral anteversion occur?
Femoral anteversion forms during development of the fetus in the womb. It typically affects both legs and is more common in girls. The exact mechanism behind femoral anteversion is unknown. It is thought to be related to genetic factors and the position of the fetus in the uterus.