Semitendinosus atrophy post ACL graft harvest

Case contributed by Dr Henry Knipe


Posterior thigh pain. Sports injury.

Patient Data

Age: 30 years
Gender: Female

Prior left ACL reconstruction. Absent distal semitendinosus tendon, presumably ACL graft donor site without regeneration.

Semitendinosus has a slightly wavy, redundant appearance. Reduced bulk of the distal semitendinosus muscle belly around the distal myotendinous junction with moderate fatty atrophy on T1WI. Superimposed STIR hyperintensity for a length of 9.5 cm and >50% cross-sectional diameter. No discrete fiber disruption. No myofascial fluid.

Case Discussion

The distal semitendinosus tendon, usually in conjunction with the distal gracilis tendon, can be used as a donor site for an ACL graft repair. The semitendinosus tendon has been shown to regrow in most (~95%) but not all patients. This case demonstrates long-standing changes of atrophy. 

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Case information

rID: 69729
Published: 19th Jul 2019
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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