10 Questions
What is femoral torsion?
The relative rotation between the bone's shaft and neck.
What is the normal anteversion angle?
About 15 degrees
What can excessive anteversion or retroversion cause?
All of the above
What is the typical femoral anteversion in healthy infants at birth?
About 40 degrees
What is the typical femoral anteversion in teenagers?
About 15 degrees
What is "in-toeing"?
An abnormal gait pattern caused by excessive femoral anteversion.
Who is excessive femoral anteversion common in?
Persons with cerebral palsy
What does the center-edge angle indicate?
The degree to which the acetabulum covers the femoral head
What does a low center-edge angle indicate?
Reduced acetabular coverage of the femoral head
What does a high center-edge angle suggest?
Excessive acetabular coverage of the femoral head
Study Notes
- Femoral torsion is the relative rotation between the bone's shaft and neck.
- A normal anteversion angle is about 15 degrees.
- Excessive anteversion or retroversion can cause hip dislocation, articular incongruence, and osteoarthritis.
- Healthy infants are born with about 40 degrees of femoral anteversion, which usually reduces to about 15 degrees by 16 years of age.
- Excessive femoral anteversion can cause an abnormal gait pattern called "in-toeing."
- Excessive femoral anteversion is common in persons with cerebral palsy.
- The center-edge angle indicates the degree to which the acetabulum covers the femoral head.
- A low center-edge angle indicates reduced acetabular coverage of the femoral head, which can increase joint pressure and lead to premature degeneration or osteoarthritis of the hip.
- A high center-edge angle suggests excessive coverage of the femoral head by the acetabulum, which may lead to impingement and injury to the hip during certain motions.
- The acetabular anteversion angle measures the extent to which the acetabulum faces anteriorly and can cause abnormal stress on the joint interface if it is close to zero or negative.
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