title: Is minimally invasive total knee arthroplasty associated with lower costs than traditional TKA?
abstract: BACKGROUND
  Studies of minimally invasive surgery (MIS) approaches to TKA have shown decreased postoperative pain, earlier return to function, and shorter lengths of stay in the hospital. However, it is unclear whether these differences translate into decreased costs or charges associated with care.
  
  
  OBJECTIVE
  We asked whether a minimally invasive approach to TKA is associated with lower inpatient charges and direct inpatient costs than the traditional approach.
  
  
  METHODS
  We retrospectively reviewed one high-volume arthroplasty surgeon's first 100 minimally invasive TKAs with the last 50 traditional TKAs with respect to all perioperative inpatient medical and billing records. Total charges minus implants (which were excluded across groups), total direct costs, and individual cost centers were analyzed.
  
  
  RESULTS
  The mean nonimplant total charge was less for patients receiving a minimally invasive TKA than a traditional TKA ($13,505 versus $14,552). With the numbers available, there was a trend for lower mean direct cost for minimally invasive TKA ($6156) versus traditional TKA ($6410).
  
  
  CONCLUSIONS
  The total inpatient charges associated with a minimally invasive TKA were less than those associated with a traditional TKA; however, the magnitude of the difference (7.2%) was modest, and there was no reduction in direct hospital costs. Other studies will need to determine whether any economic benefits associated with minimally invasive TKA accrue after discharge. The decision regarding whether to perform minimally invasive TKA should be made on clinical grounds, as the medical-economic case on the inpatient side is not compelling.
authors.affiliation: Department of Orthopaedics and Sports Medicine, University of Washington School of Medicine, Box 356500, Seattle, WA 98195, USA.
authors.forename: Jason C
authors.initials: JC
authors.lastname: King
authors.forename: Paul A
authors.initials: PA
authors.lastname: Manner
authors.forename: Daniel L
authors.initials: DL
authors.lastname: Stamper
authors.forename: Douglas C
authors.initials: DC
authors.lastname: Schaad
authors.forename: Seth S
authors.initials: SS
authors.lastname: Leopold
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000191:economics / Q000379:methods*; D003362:Cost-Benefit Analysis; D004180:Direct Service Costs; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000191:economics*; D010149:Postoperative Pain / Q000517:prevention & control*; D016059:Range of Motion, Articular / Q000502:physiology*; D020127:Recovery of Function; D012189:Retrospective Studies