Critical Lower-Limb Ischemia and Arterial Thrombosis Following Intraarticular Corticosteroid Injection of the Knee.

We present a case of acute lower-limb arterial thrombosis following intra-articular steroid injection into the knee of a previously fit and active 41-year-old man. Symptoms of acute limb ischemia developed within 24 hours of treatment. Objective assessment with ultrasound arterial duplex and CT angiogram of the lower limb confirmed acute thrombosis of the popliteal artery in the treated leg. Although there is documented evidence of the association between steroid therapy and venous thromboembolic phenomena, there are no cases of arterial thrombosis in the literature. The temporal series of events that we report strongly suggest an association between the corticosteroid injection and the acute thrombotic event, the mechanism of which remains unclear. The patient underwent successful revascularization. It is important to document and disseminate this seemingly rare complication of a commonly associated procedure to increase awareness, invoke caution, and invite others to share similar cases.