Overview It is mainly caused by edema, ankle sprain fracture or arthritis. It is characterized by banding and swelling of the anterior aspect of the joint, loss of ridge, and limited dorsiflexion and plantarflexion of the joint. Presentation Swelling of the anterior aspect of the affected joint or fullness of the joint as a whole; pressure pain in the joint space; limitation of joint movement or pain; aspiration of fluid to confirm the diagnosis. Treatment Ice, elevation of the affected limb, weight restriction, and joint mobility rehabilitation are the treatment options. Puncture and synovial fluid analysis are options for treating acute effusion. After 3 weeks of ankle immobilization, passive joint mobility stretching exercises are performed. High-top shoes are recommended to limit sharp stops and running movements. Stretching exercises for the Achilles tendon and tension exercises for the peroneal tendon are performed daily. Surgical treatment is considered for cases with more than 50% loss of joint range of motion and severe interference with daily activities. Prognosis The prognosis of septic arthritis is difficult to determine.