Shoulder dislocations with fractures are a possible complication of an epileptic seizure and are often missed on the first sight. The incidence of sustaining an avascular humeral head necrosis (AVN) is high, and primary prosthetic replacement is the choice of treatment. In this paper, we describe such a rare case: a 48-year-old male patient sustained simultaneous bilateral posterior shoulder dislocation with fractures of both humeral heads following the first episode of an epileptic convulsion. On the left side, open reduction and internal fixation were performed with angle stable plate osteosynthesis. In the same operation, a hemi-prosthesis was implanted on the right side. One and a half years postoperatively, function on the right side is unsatisfying and AVN is seen on the left side and secondary prosthetic replacement had to be performed. In case of a shoulder dislocation with a complex fracture after an epileptic seizure, prosthetic replacement is the choice of treatment.
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