Complication after knee intra-articular betamethasone injection, a thrombocytopenic purpura: a case report

The corticosteroid injection was likely to have caused the symptoms owing to the following evidence: firstly, the acute clinical presentation (only a few hours after the injection); secondly, the rapid improvement in the patient's condition; and thirdly, the absence of further signs indicating other serious complications. Thrombocytopenic purpura, a rare systemic adverse drug reaction, has not been previously described.