Biceps femoris injury - BAC grade 3b

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% crosses sectional diameter of the muscle belly. Fiber disruption length of approximately 9 cm. 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 3b (extensive). 

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Case information

rID: 69730
Published: 19th Jul 2019
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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