The Simulab Arthrocentesis Model allows learners to diagnose and manage the presence of knee effusion. The trainer represents an extended left leg with ultrasound compatible areas. These areas include the patella, patella ligament, tibia, fibula, femur, synovial sac, and synovial fluid. Synovial fluid can be aspirated from a joint cavity using the medial or lateral approach. Insertion sites include suprapatellar and parapatellar.