Open Access Research article

Dynamic-locking-screw (DLS)–leads to less secondary screw perforations in proximal humerus fractures

Thomas Freude1, Steffen Schroeter1, Michael Plecko2, Christian Bahrs1, Frank Martetschlaeger3, Tobias M Kraus1*, Ulrich Stoeckle1 and Stefan Doebele1

Author Affiliations

1 Department of Traumatology and Reconstructive Surgery, BG Unfallklinik, Eberhard Karls Universitaet Tuebingen, Schnarrenbergstrasse 95, 72076 Tuebingen, Germany

2 Department of Traumatology, University Hospital Zurich, University of Zurich, Raemistrasse 100, CH-8091 Zurich, Switzerland

3 Department of Orthopeadic Sports Medicine, University Hospital rechts der Isar, Technische Universitaet Munich, Munich, Germany

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BMC Musculoskeletal Disorders 2014, 15:194  doi:10.1186/1471-2474-15-194

Published: 4 June 2014



Loss of reduction and screw perforation causes high failure rates in the treatment of proximal humerus fractures. The purpose of the present study was to evaluate the early postoperative complications using modern Dynamic Locking Screws (DLS 3.7) for plating of proximal humerus fractures.


Between 03/2009 and 12/2010, 64 patients with acute proximal humerus fractures were treated by angular stable plate fixation using DLSs in a limited multi-centre study. Follow-up examinations were performed three, six, twelve and twenty-four weeks postoperatively and any complications were carefully collected.


56 of 64 patients were examined at the six-month follow-up. Complications were observed in 12 patients (22%). In five cases (9%), a perforation of the DLS 3.7 occurred.


Despite the use of modern DLS 3.7, the early complications after plating of proximal humerus fractures remain high. The potential advantage of the DLS 3.7 regarding secondary screw perforation has to be confirmed by future randomized controlled trials.

Dynamic-locking-screw 3.7; Proximal humerus fracture; Locking compression plate; Fracture healing