*We accept our last walk-in at 6:15 PM Monday – Friday and at 4:15 PM on Saturday and Sunday* OS1 Orthopedic & Sports Injury Clinic is a full-service, orthopedic urgent care walk-in clinic. OS1 specializes in urgent care treatment of acute to serious orthopedic injuries and select chronic conditions. Patients are able to walk-in to see a sports medicine physician quickly, and the commitment to offering expert, technology-based care sets it apart from ER's and traditional urgent care centers.