Figure 2
From: Simple method for confirming tibial osteotomy during total knee arthroplasty
View of our original intraoperative protractor ( right , anteroposterior view; left , lateral view). The protractor is constructed with a 10-cm bar and a 20-cm bar. There is a projection at a point of intersection where the 10-cm bar is at the tibial tuberosity and the distal 20-cm bar is at the anterior tibial crest. The angle made by the two bars make is displayed on a scale at their intersection.