1. Centers for Disease Control and Prevention Arthritis: addressing the nation's most common cause of disability at a glance 2015 http://www.cdc.gov/chronicdisease/resources/publications/aag/arthritis.htm
2. Healthcare Cost and Utilization Project (HCUP) HCUP projections: mobility/orthopedic procedures, 2003 to 2012 http://www.hcup-us.ahrq.gov/reports/projections/2012-03.pdf
3. Total knee arthroplasty volume, utilization, and outcomes among Medicare beneficiaries, 1991-2010;Cram;JAMA,2012
4. Underlying reasons associated with hospital readmission following surgery in the United States;Merkow;JAMA,2015
5. Centers for Medicare & Medicaid Services Readmissions reduction program (HRRP) 2012 https://www.cms.gov/medicare/medicare-fee-for-service-payment/acuteinpatientpps/readmissions-reduction-program.html