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Fig. 8 | BMC Musculoskeletal Disorders

Fig. 8

From: Navigation-assisted suture anchor insertion for arthroscopic rotator cuff repair

Fig. 8

Cone phenomenon for arthroscopic instrument movement. The top of the cone represents the instrument portal. The red line represents the range of instrument or anchor, and the eyes show the viewing portals from the lateral, posterior, and top positions of the cone. Looking from the posterior or lateral portal can result in angles and locations of the anchor or instrument that can vary and be difficult to measure. The view from the top of the cone can better select the anchor or instrument location, and the angle can be determined based on the ratio of cone height to the anchor tip distance from the radial center, tan θ (θ= instrument angle to the cortical surface)

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