Inpatient Mortality Rate for Knee Replacement Knee replacement (knee arthroplasty) has a relatively low mortality rate. In 2011, the inpatient mortality rate for knee replacement at Highland Hospital was 0.00%, which is better than the University HealthSystem Consortium (UHC) Rate of 0.10%. The mortality rate (measured as a percentage) provides general information about the quality of care delivery, and can be an important quality indicator. However, some hospitals care for patients with a greater severity of illness and therefore may have a higher mortality rate. The known predictors of inpatient mortality include age and the presence of any significant coexisting conditions such as diabetes, obesity, or heart disease. University HealthsSystem Consortium (UHC), is an alliance of 107 academic medical centers and 220 of their affiliated hospitals, representing approximately 90% of the nation’s non-profit academic medical centers.