(Fig 4-A.21) Excessive Femoral Anteversion

https://youtu.be/zBhAJpPXQXA

https://youtu.be/vzxclU_34OI?si=B88NykUJHSELzyAC

 

 

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📌 Genu Valgum and Rotational Malalignment

• Lower extremity imaging is essential in evaluating genu valgum and rotational malalignment, such as excessive femoral anteversion and external tibial rotation.

1️⃣ Femoral Anteversion:

• Definition: The angle between the posterior condyle line and the femoral neck axis.
• Clinical Impact: Increased femoral anteversion causes medialization of the trochlea, creating a lateral vector force on the patella, leading to abnormal patellofemoral load and lateral subluxation.
• Measurement: Typically, values greater than 30° on 3D CT indicate excessive femoral anteversion.
• Management: Derotational osteotomy is recommended for significant rotational deformity.

 

✅ Considerations:

• Age Dependency: Femoral anteversion decreases from birth (30-40°) to adulthood (8-14°). Males usually have slightly less anteversion compared to females.

2️⃣ Tibial Torsion:

• Impact: Increased external tibial torsion leads to foot external rotation and knee valgus, contributing to a lateral force on the patella.

 

➡️ References:

Radiographics. 2023 Jun;43(6):e220177

J Orthop Surg Res. 2022 Jul 28;17(1):366

Knee Surg Sports Traumatol Arthrosc. 2021 Apr;29(4):1075-1082

Radiology 2012; 263:475–483

 

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#GenuValgum, #RotationalMalalignment, #FemoralAnteversion, #PatellofemoralLoad, #LateralSubluxation, #DerotationalOsteotomy, #OrthopedicImaging, #KneeValgus, #FemoralTorsion,