Fig. 1

The primary unique elements of the SEIP technique include the following: a shows a more distal tibial entry point (the red arrow represents a traditional HFIP entry point while the blue arrow represents a SEIP entry point); b represents modern IMN designs, including suitable Herzog curvature on the proximal side, curvature on the distal side, and a short proximal jig; c shows an extra-articular approach with the knees flexed about 30°; and d indicates the use of a protective soft pad on the femoral side. SEIP semi-extended infrapatellar, HFIP hyperflexed infrapatellar