Fig. 1From: Diagnostic considerations in the clinical management of sudden swelling of the knee: a case report and review of the literatureArthroscopy images taken during emergent arthroscopic lavage of the patient’s knee. a Arthroscopy image shows slight synovitis at the injection site with petechial bleeding. b Arthroscopy image after debridement of the synovitis. c Arthroscopy image revealing bleeding and necrosis at the injection siteBack to article page