In this study. we investigated the correlation between fracture classification and secondary screw penetration. We retrospectively identified 189 patients with displaced proximal humeral fractures treated by ORIF at our hospital between June 2006 and June 2013. All fractures were classified radiographically before surgery and follow-up for least 2 years after surgery was recommended. https://www.roneverhart.com/275-55R20-X-FIT-AT/