Biceps femoris injury - BAC grade 3c

Case contributed by Dr Henry Knipe


Sports injury. Posterior thigh pain.

Patient Data

Age: 25 years
Gender: Male

Injury to the proximal myotendinous junction of biceps femoris with hyperintensity extending for a craniocaudal length of approximately 16 cm involving more than 50% cross-sectional diameter of the muscle belly. Fiber disruption length of approximately 9 cm with involvement of the central tendon slip. There is extension to the fascia with myofascial fluid both posterior and anterior, notably with fluid tracking around the sciatic nerve. There is no extension into the proximal free tendon nor any involvement of the distal myotendinous junction or free tendon.

Case Discussion

The proximal myotendinous junction of biceps femoris is the most common site of a hamstring injury. Using the British Athletics muscle injury classification this is grade 3c (extensive). 

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Case information

rID: 69730
Published: 19th Jul 2019
Last edited: 24th Feb 2020
Inclusion in quiz mode: Included

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