Comparative Study Between Computer Assisted-Navigation and Conventional Technique in Minimally Invasive Surgery Total Knee Arthroplasty, Prospective Control Study
Thanainit Chotanaphuti MD*, Pipat Ongnamthip MD*, Krit Teeraleekul MD*, Chalermrit Kraturerk MD*
Affiliation : * Department of Orthopaedics, Phramongkutklao Hospital & College of Medicine, Bangkok
Background : Both Minimally Invasive surgery (MIS) and Computer-Assisted Surgery (CAS) are useful in
Total Knee Arthroplasty (TKA). Minimally invasive total knee arthroplasty was associated with decreased
blood loss, shorter hospital stays, and increased range of motion. Computer-assisted surgery in total knee
arthroplasty was developed to improve the positioning of implants during surgery.
Objective : To evaluate radiographic results relative to component position and limb alignment when using a
navigation system compared with conventional technique in MIS-TKA.
Material and Method: A prospective control study was performed in 180 patients who underwent total knee
arthroplasty by one surgeon. All patients were randomly divided into two groups, Conventional and Navigation
TKA. Intra-, post-operative data, and postoperative limb alignment were recorded for comparison in both
groups.
Results : The postoperative mechanical axis was within 3° of neutral mechanical alignment in 94% of the
navigation group and 87% in conventional group (p = 0.13). Registration time of navigation group is 13.58
minutes. No statistical significant difference was found in tourniquet time and postoperative blood loss in
both groups.
Conclusion : The use of navigation in total knee arthroplasty increases accuracy in limb and implants alignment,
and does not increase complications and surgical times.
Keywords : Computer-assisted surgery, Minimally invasive surgery, Total knee arthroplasty
