Ability to Achieve Mediolateral Gap Balance with Instrumented Navigated Total Knee Arthroplasty – A Review of the First 150 Cases

Abstract

Appropriate management of the soft tissue envelope at the time of the surgery is critical to the long- term success of total knee arthroplasty (TKA). In this regard, thiscomputer-assisted orthopedic surgery (a force-controlled intraarticular distractor. The first 150 cases performed by 16 surgeons were reported without any exclusions, and for each of these cases, the final mediolateral (ML) laxity was compared to the predicted ML laxity. The average signed ML laxity was well aligned with a neutral differential throughout the full arc of motion and ranged from -0.05mm at 35° of flexion to 0.37mm at 85° of flexion. The signed ML laxity curves tend to be surgeon specific. The average unsigned ML laxity was linear throughout the full arc motion and ranged from 1.14mm at 85° of flexion to 1.27mmat 30° of flexion.the targeted ML gap balance when using afeaturingDespite data from all the users (not only design surgeons) involved with this pilotrelease were considered and the learning curve cases were not excluded, it was observed a high abilitystudy evaluated the ability to achieveCAOS) systemto achieve the targeted ML laxity using the proposed method.