Biomechanical evaluation of a new fixation technique for internal fixation of three-part proximal humerus fractures in a novel cadaveric model

Clinical Biomechanics
Stefano BrianzaKarsten Schwieger

Abstract

The optimal surgical treatment for displaced proximal humeral fractures is still controversial. A new implant for the treatment of three-part fractures has been recently designed. It supplements the existing Expert Humeral Nail with a locking plate. We developed a novel humeral cadaveric model and the existing implant and the prototype were biomechanically compared to determine their ability in maintaining interfragmentary stability. The bone mineral density of eight pairs of cadaveric humeri was assessed and a three-part proximal humeral fracture was simulated with a Greater Tuberosity osteotomy and a surgical neck wedge ostectomy. The specimens were randomly assigned to either treatment. A bone anchor simulated part of a rotator cuff tendon pulling on the Greater Tuberosity. Specimens were initially tested in axial compression and afterward with a compound cyclic load to failure. An optical 3D motion tracking system continuously monitored the relative interfragmentary movements. The specimen stabilized with the prototype demonstrated higher stiffness (P=0.036) and better interfragmentary stability (P values<0.028) than the contralateral treated with the existing implant. There was no correlation between the bone mineral densi...Continue Reading

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Citations

Oct 31, 2012·American Journal of Veterinary Research·Stephan RothstockStefano Brianza
Jun 12, 2012·Medical Engineering & Physics·Damiano SchiumaBoyko Gueorguiev
Nov 18, 2011·Injury·Stefano BrianzaAndrea E Tami
Jul 26, 2011·Journal of Shoulder and Elbow Surgery·Roxanne M ChowMartin J Bouliane
Aug 26, 2015·Der Unfallchirurg·A ScolaG Röderer
Jun 5, 2013·The Open Orthopaedics Journal·Alexander ScolaGötz Röderer
Dec 9, 2020·Journal of Biomechanics·Luca CristofoliniEnrico Guerra
Mar 9, 2021·JSES International·Florian GrubhoferSamy Bouaicha
Nov 6, 2021·European Journal of Orthopaedic Surgery & Traumatology : Orthopédie Traumatologie·Dmitry PokhvashchevMarmor T Meir

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