Hospitalization for Total Knee Replacement Among Inpatients Aged 45 and Over: United States, 2000-2010.

In 2010, total knee replacement was the most frequently performed inpatient procedure on adults aged 45 and over. In the 11-year period from 2000 through 2010, an estimated 5.2 million total knee replacements were performed.

Hospitalization for total hip replacement among inpatients aged 45 and over: United States, 2000-2010.

　Total hip replacement, in which both the head of the femur and its socket are replaced, is done to restore movement to hips damaged by osteoarthritis, late-stage degenerative bone and cartilage disease, or other injuries and disease (1). The number of total hip replacements is expected to increase over the next few decades (2). National Hospital Discharge Survey (NHDS) data show trends and estimates of the number and rate of total hip replacements and average length of stay among inpatients aged 45 and over.