title: A comparison of blood loss in minimally invasive surgery with and without electromagnetic computer navigation in total knee arthroplasty.
abstract: OBJECTIVE
  To compare the blood loss after minimally invasive surgery total knee arthroplasty (MIS-TKA) between the procedures performed with and without electromagnetic computer navigation.
  
  
  METHODS
  Eighty patients were recruited for a cohort study of the minimally invasive surgery total knee arthroplasty (MIS-TKA) for the treatment of osteoarthritis. They were divided into two groups, 40 patients had a computer-assisted surgery procedure for the minimally invasive surgery total knee arthroplasty (CAS-MIS-TKA) and the other 40 patients had a conventional procedure for the minimally invasive surgery total knee arthroplasty (MIS-TKA). The surgery in both groups was carried out by a single surgeon at one institution using a uniform approach. The blood loss in each group was evaluated and analyzed for the statistical difference.
  
  
  RESULTS
  The result showed that the mean blood loss from the drainage of the CAS-MIS-TKA group (389.88 +/- 215.57 milliliters) was slightly lower than the MIS-TKA group (425.25 +/- 269.40 milliliters), which had no significant difference (p-value 0.519). Moreover, the whole blood loss in the CAS-MIS-TKA group (948.45 +/- 431.63 milliliters) was slightly lower than the MIS-TKA group (1075.32 +/- 419.02 milliliters). The difference was also not statistically significant.
  
  
  CONCLUSIONS
  Electromagnetic computer-assisted surgery did not reduce blood loss in the minimally invasive surgery total knee arthroplasty (MIS-TKA).
authors.affiliation: Department of Orthopaedics Surgery, Bangkok Metropolitan Administration Medical College and Vajira Hospital, Bangkok, Thailand. satitthh@hotmail.com
authors.forename: Satit
authors.initials: S
authors.lastname: Thiengwittayaporn
authors.forename: Detchart
authors.initials: D
authors.lastname: Junsee
authors.forename: Aree
authors.initials: A
authors.lastname: Tanavalee
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000379:methods* / Q000534:rehabilitation; D016063:Blood Loss, Surgical; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000009:adverse effects / Q000379:methods* / Q000534:rehabilitation; D020370:Osteoarthritis, Knee / Q000601:surgery*; D011183:Postoperative Complications; D020127:Recovery of Function; D025321:Surgery, Computer-Assisted / Q000379:methods*