Brockman B, et al. - Given that increased complication rates have been shown in posttraumatic arthritis (PTA) patients undergoing total knee arthroplasty (TKA), researchers sought to directly compare the results of TKA performed for osteoarthritis (OA) and PTA. To identify patients undergoing elective TKA between 2006 and 2015 for OA and PTA, the National Inpatient Sample (NIS) was utilized. The prevalence of preoperative comorbidities and the incidence of postoperative complications including superficial wound infection, deep joint infection, acute deep venous thrombosis (DVT), and pulmonary embolus (PE) have been analyzed. The NIS database accounted for 1,301,394 patients diagnosed with either PTA (14,206) or OA (1,287,188) undergoing TKA between 2006 and 2015. In patients with PTA diagnosis, the incidence of superficial wound infection, deep joint infection and acute DVT were found to occur at a higher rate compared with OA. Investigators found that PTA patients had a higher prevalence of drug and alcohol abuse, psychosis, and liver disease. On the other hand, patients with OA had a higher prevalence of obesity, diabetes, heart disease and lung disease. The data presented in this work showed an increased risk of complications in patients undergoing TKA for PTA vs OA. Surgeons can use this data to assist with preoperative counseling of patients. In addition, this information offers objective proof that could affect the establishment of bundled payment reimbursement in this patient population.