A Comparison of Blood Loss in Minimally Invasive Surgery with and without Electromagnetic Computer Navigation in Total Knee Arthroplasty
Satit Thiengwittayaporn MD*, Detchart Junsee MD*, Aree Tanavalee MD**
Affiliation : * Department of Orthopaedics Surgery, Bangkok Metropolitan Administration Medical College and Vajira Hospital, Bangkok, Thailand ** Department of Orthopaedics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
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.
Material and Method: 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 (1,075.32 + 419.02 milliliters). The difference
was also not statistically significant.
Conclusion : Electromagnetic computer-assisted surgery did not reduce blood loss in the minimally invasive
surgery total knee arthroplasty (MIS-TKA).
Keywords : Electromagnetic computer-navigation procedure, Minimally invasive surgery, Total knee arthroplasty, Blood loss
