For this study, researchers analyzed usage and outcomes data of 3,271,851 patients who underwent primary TKA and 318,563 patients who underwent revision TKA between 1991 and 2010. Their analysis showed the number of primary TKA procedures increased from 93,230 in 1991 to 243,802 in 2010, an increase of 161.5 percent, and the number of revision TKA procedures increased from 9,650 in 1991 to 19,871 in 2010, an increase of 105.9 percent.
This increase is driven principally by an increase in the number of Medicare enrollees and increase in per capita utilization. While the number of TKA procedures has gone up, researchers also found hospital readmissions and infection rates have gone up (although hospital length of stay for TKA patients has gone down).
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