Patient Portal; Find a Doctor; Care & Services. Back to Main Menu; ... Orthopaedic Surgical Associates, PC. 14 Research Place North Chelmsford, MA 01863 (978) 454-0706 (978) 259-4692 Website. Additional Office Locations. Orthopaedic Surgical Associates, PC. 14 Research Place North Chelmsford, MA 01863 (978) 454-0706 (978) 259-4692 Website ....