Hemorrhagic Carpal Synovitis (Hemarthrosis)

Painful unilateral carpal swelling in a Holstein calf approximately 30 days old. The sudden onset and the absence of prior umbilical or enteric disease suggest a traumatic origin for the lesion.
Arthrocentesis reveals the presence of blood, confirming the suspicion of a recent trauma.
Given the severity of the effusion and the risk that the arthrosynovitic process could become chronic, evolving into a hyperplastic and fibrotic form, surgical treatment is preferred to evacuate and drain the synovial fluid.