How many degrees of posterior slope is built into the Legion Tibia Baseplate (MALE)?

• A. 3 degrees
• B. 0 degrees
• C. 4 degrees
• D. 7 degrees

Answer: (A)

The amount of posterior slope built into a tibial baseplate shapes how the knee moves as it bends. The Legion Tibia Baseplate for the MALE is designed with a fixed posterior slope of 3 degrees. This modest tilt mirrors the typical slope of the native tibial plateau and helps the femur roll back smoothly during flexion, improving the knee’s flexion arc and overall kinematics. It also helps align the articulation with the rest of the implant without needing extra bone resection.

If the slope were zero, there would be less natural rollback, which can limit flexion. If the slope were larger, like 4 or 7 degrees, it could alter ligament tension and potentially cause impingement or instability in some patients. So 3 degrees is the balanced choice built into this baseplate.