(Fig 3-B.23) Anatomy of Biceps Femoris Arms: Direct and Anterior

https://youtu.be/ivHVNJxEIcM

https://youtu.be/6WOItzqJj1g

 

📌 Anatomy of the Biceps Femoris Tendon

 

• Distal Biceps Femoris Tendon The distal tendon of the biceps femoris merges with the lateral collateral ligament (LCL) 1 cm above the fibular head, inserting as a single conjoined tendon onto the lateral aspect of the fibular head. 
• The LCL inserts anteriorly and the biceps femoris tendon inserts posteriorly.
• Tendon Composition on Axial Imaging On axial imaging, the biceps femoris tendon does not appear as a single structure. 
• Instead, it consists of different tendinous and fascial components, most attaching to the fibular head, with potential tibial attachment.

 

✅Long Head Tendon Arms The long head 

• Anterior Arm - Inserts on lateral fibular head/neck
• Direct Arm - Inserts posteriorly on lateral fibular head/neck

 

✅ Short Head Tendon Arms

• Direct Arm - Inserts anteromedially on fibular head
• Anterior Arm - Does not attach to fibula, passes medial to LCL to attach on superolateral tibial condyle

★ Additional Point 

• The anterior arm of the short head attaches posterior to Gerdy's tubercle, distal to the anterolateral ligament insertion.
• Therefore, a Segond fracture (avulsion of the mid-third lateral capsular ligament) may involve this tendon arm.

Radiol Clin North Am. 2018 Nov;56(6):935-951

RadioGraphics 2016; 36:1776–1791

Radiographics. 2016 Oct;36(6):1776-1791. 

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