Seizures as the cause of skeletal fractures are well recognized. The commonest is fracture of the humerus. Bilateral fractures are rare and extremely rare in combination with posterior dislocation of the shoulder joint. Two cases of this condition with very unusual etiology are described here. The mechanism of the injury is described and the treatment discussed. Regardless of the method of primary reposition employed, no difference in the subsequent joint function appears to be observed. Nevertheless, recognition of the condition and early reduction are of importance for the result.