What is the intercondylar eminence ridge location and its significance?

• A. Location: anterior tibial crest; Significance: resection.
• B. Location: posterior tibial surface; Significance: tension.
• C. Location: intercondylar notch; Significance: varus valgus.
• D. Location: based upon the axis of the point probe, halfway up the tibial spine making sure to protect the ACL. Significance: Sizing: ML distance btw IER and Most Medial Point; Planning: sets the rotation of the tibial implant based upon the anticipated sagittal cut.

Answer: (D)

The intercondylar eminence ridge is a central landmark on the tibial plateau, located along the tibial spine. In knee reconstruction, this ridge provides a reproducible reference point for aligning the tibial component. Using an axis defined by the point probe and positioned halfway up the tibial spine helps protect the ACL footprint while planning.

This reference is used for two main purposes: sizing the tibial component in the medio-lateral direction (measuring the ML distance between the intercondylar region and the most medial point) and planning the rotation of the tibial implant based on the anticipated sagittal cut. By anchoring the implant orientation to this ridge, surgeons can achieve correct alignment and avoid compromising the ACL.