Abnormally Prolonged Bleeding After an Arthroscopic Knee Reconstruction Because of an Inherited Factor XIII Deficiency: A Case Report.

Case: An 18-year-old man developed ecchymosis after arthroscopic anterior cruciate ligament reconstruction with semitendinosus graft and meniscal repair. The results of routine coagulation studies were normal, but factor assays showed a reduction in factor XIII levels. The bleeding symptoms were dramatically improved after administration of cryoprecipitate.