Fig. 1

Aiming guides for medial meniscus (MM) posterior root repair. a A conventional meniscal root marking hook (upper, Arthrex). The Unicorn Meniscal Root (UMR) guide (lower). An inlet denotes the difference between each guide in shape, sizing scale, and aiming system. A guide-wire catching point (red arrows) is set at the tip of the UMR guide. The catching point of the conventional guide is set at the neck of the hook. The length of a curving part between a border (dashed lines) and catching point is longer in the UMR guide than in the conventional guide. The UMR guide has a more anatomic design to aim the native MM posterior root attachment compared with the conventional guide. b A push-button locking system for both sides of the knee. c A point-contact aiming system of the UMR guide. d The UMR guide has a narrow/slim curving shape based on an anatomic design. e The UMR and meniscus posterior root tear (MMPRT) guides. f The difference in a guide-wire catching system between the two guides