Stefanie Doht1, Hendrik Jansen, Rainer Meffert, Sönke Frey. 1. Department of Trauma, Hand, Plastic and Reconstructive Surgery, University Clinics of Würzburg, Oberduerrbacher Strasse 6, 97080, Würzburg, Germany. doht_s@klinik.uni-wuerzburg.de
Abstract
PURPOSE: The aim of this study was to determine the biomechanical characteristics of locking plates with the TriLock system with different design and screw settings compared to a non-locking plate in a diaphyseal metacarpal fracture. METHODS: Oblique diaphyseal shaft fractures in porcine metacarpal bones were created in a biomechanical fracture model. After reduction they were fixed with three different locking plates with the TriLock interlocking mechanism or a non-locking linear plate in mono- or bicortical screw fixations. In load to failure tests the maximum load and stiffness were measured. RESULTS: For linear plates, the maximum load was higher for the non-locking plate compared with the locking plate. The maximum load could be increased for the locking plates using a double-row design and a higher screw number. No differences were found for the stiffness between all groups. In contrast to the non-locking plate, the mode of failure of the locking plates in many cases (86 %) was a loss of the interlocking mechanism. CONCLUSIONS: The results suggest that the locking plates with the TriLock system achieve no higher stability compared to a non-locking plate in load to failure tests. Adaptions to increase the stability of the interlocking mechanism are desirable.
PURPOSE: The aim of this study was to determine the biomechanical characteristics of locking plates with the TriLock system with different design and screw settings compared to a non-locking plate in a diaphyseal metacarpal fracture. METHODS: Oblique diaphyseal shaft fractures in porcine metacarpal bones were created in a biomechanical fracture model. After reduction they were fixed with three different locking plates with the TriLock interlocking mechanism or a non-locking linear plate in mono- or bicortical screw fixations. In load to failure tests the maximum load and stiffness were measured. RESULTS: For linear plates, the maximum load was higher for the non-locking plate compared with the locking plate. The maximum load could be increased for the locking plates using a double-row design and a higher screw number. No differences were found for the stiffness between all groups. In contrast to the non-locking plate, the mode of failure of the locking plates in many cases (86 %) was a loss of the interlocking mechanism. CONCLUSIONS: The results suggest that the locking plates with the TriLock system achieve no higher stability compared to a non-locking plate in load to failure tests. Adaptions to increase the stability of the interlocking mechanism are desirable.
Authors: Sabine Ochman; Stephanie Doht; Juergen Paletta; Martin Langer; Michael J Raschke; Rainer H Meffert Journal: J Hand Surg Am Date: 2010-03-17 Impact factor: 2.230
Authors: C D Prevel; B L Eppley; J R Jackson; K Moore; M McCarty; R Sood; R ] Wood R [corrected to Sood Journal: J Hand Surg Am Date: 1995-01 Impact factor: 2.230