Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : The calcar screw in angular stable plate fixation of proximal humeral fractures - a case study | Osterhoff et al. Journal of Orthopaedic Surgery and Research 2011 6 50 http content 6 1 50 JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH RESEARCH ARTICLE Open Access The calcar screw in angular stable plate fixation of proximal humeral fractures - a case study Georg Osterhoff Christian Ossendorf Guido A Wanner Hans-Peter Simmen and Clément M Werner Abstract Background With new minimally-invasive approaches for angular stable plate fixation of proximal humeral fractures the need for the placement of oblique inferomedial screws calcar screw has increasingly been discussed. The purpose of this study was to investigate the influence of calcar screws on secondary loss of reduction and on the occurrence of complications. Methods Patients with a proximal humeral fracture who underwent angular stable plate fixation between 01 2007 and 07 2009 were included. On AP views of the shoulder the difference in height between humeral head and the proximal end of the plate were determined postoperatively and at follow-up. Additionally the occurrence of complications was documented. Patients with calcar screws were assigned to group C patients without to group C-. Results Follow-up was possible in 60 patients C M C- M . Humeral head necrosis occurred in 6 C and 3 C- cases. Cut-out of the proximal screws was observed in 3 C and 1 C- cases. In each group 1 patient showed delayed union. Implant failure or lesions of the axillary nerve were not observed. In 44 patients true AP and Neer views were available to measure the head-plate distance. There was a significant loss of reduction in group C- mm compared to C mm p . Conclusions The placement of calcar screws in the angular stable plate fixation of proximal humeral fractures is associated with less secondary loss of reduction by providing inferomedial support. An increased risk for complications could not be shown. Keywords Proximal humerus fracture locked .
