Fig 4.

Arthroscopic visualization before and after medial tibial spine resection. Side-by-side arthroscopic images of a left knee in the supine position with the knee flexed to 90°, viewed using a 30° arthroscope from the anteromedial portal. (A) Preresection: Prior to resection, the upsloping medial tibial spine (E, outlined in red) impinges on the visual field and obstructs instrument access to the posterior root of the medial meniscus (C). The medial femoral condyle (A), medial tibial plateau (B), and a radiofrequency ablation probe (D), introduced through the anterolateral portal, are also visible. The elevated profile of the medial tibial eminence limits guide positioning and restricts surgical maneuverability. (B) Postresection: Following controlled removal of the medial tibial spine (E), an unobstructed view of the posterior root of the medial meniscus (C) is obtained. The resection creates a flatter working surface, allowing easier placement of drill guides and improved visualization for root repair. A probe (D) introduced through the anterolateral portal confirms access and positioning. The medial femoral condyle (A) and tibial plateau (B) are again shown for orientation.