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Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_16 | Pages 57 - 57
1 Apr 2013
Stephan D Hoffmann S Roth KE Augat P
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Introduction

Metatarsocuneiform (MTC) fusion is a standard treatment for arthritis, instability, and deformity of these joint. The MTC fusion achieves a good clinical outcome, but nonunion rates up to 12% have been reported. There are different methods for fixation of first MTC joint arthrodesis. Our aim was to compare the biomechanical characteristic of internal and external fixation constructs.

Hypothesis

Plantar plate fixation provides higher construct stiffness and endurance stability than intraosseous fixation.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_16 | Pages 13 - 13
1 Apr 2013
Hoffmann S Paetzold R Mair S Stephan D Buehren V Augat P
Full Access

Hypothesis

The proximal geometry and design of trochanteric nails affects initial construct stiffness, fatigue survival, and preservation of biomechanical stability over time.

Materials & Methods

Eight pairs of human cadaveric femora were implanted with two different short intramedullary nails with (Intertan, (S&N)) and without (Gamma 3, (Stryker)) interlocking lag screws. Femoral osteotomies were performed to generate a pertrochanteric multifragmentary unstable fracture (OTA 31-A 2.2). The bones were tested in a cyclic testing protocol with increasing loads of 100 N every 20.000 cycles (start point 50/500 N) simulating one leg stance. The position of the femur was 10° adduction and 10° extension. Stiffness, failure load, and cycles to failure were measured.