Fig. 5From: Navigation-assisted anchor insertion in shoulder arthroscopy: a validity studyComparison of the vertical angle errors at the first and second anchor spots. In the phantom-based anchor insertion experiments, the anchoring angle error in the expert group significantly decreased when the proposed navigation system was used (*). The mean for each participant, including those in the expert and novice groups, shows a significant difference between the conventional and proposed navigation systems in terms of anchoring angle error (**)Back to article page