gartland classification gartland classification the gartland classification is a system of categorizing supracondylar humerus fractures, clinically useful as it predicts the likelihood of associated neurovascular injury, such as anterior interosseous nerve neurapraxia or brachial artery disruption. classification supracondylar fractures: gartland classification type³ description i non-displaced ii angulated with intact posterior cortex iia angulation iib angulation with rotation iii complete displacement but have perisosteal (medial/lateral) contact iiia medial periosteal hinge intact. distal fragment goes posteromedially iiib lateral periosteal hinge intact. distal fragment goes posterolaterally iv periostial disruption with instability in both flexion and extension