Is there difference of the pre operative planning of the total knee arthroplasty between orthopedic surgeons?

To our knowledge, no studies have yet been conducted comparing the pre-operative planning of patients between orthopedic surgeons, experienced with patient specific matched instruments.
This study is designed to address the following research question: is there a significant difference between the alignment of the individual femoral and tibial components as planned.

We hypothesise that there would be no significant difference between the preoperative planning between different orthopedic surgeons.

N/A

Fifty cases will be random selected from the total cohort. The planning of these cases will be evaluated by 10 international orthopedic surgeons experienced with patient matched instruments. No patients are involved, only the pre operative plan of patients will be used.

Based on 50 plans for each surgeon, inter observer variability will be calculated



Twenty five cases will be random selected from the total cohort. The planning of these cases will be evaluated by 4 orthopedic surgeons. Each case will be planned for 3 times by each surgeon. Surgeons in Orbis Medisch Centrum will participate in this study. No patients are involved, only the pre operative plan of operated patients will be used.

Based on 3 plans for each case, intra-observer variability will be calculated

Based on 25 plans for each surgeon, inter observer variability will be calculated