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[Internal fixation of proximal humerus fractures]
M H Hessmann1, W Sternstein, F Krummenauer
1Klinik und Poliklinik für Unfallchirurgie, Johannes-Gutenberg-Universität. Hessmann@unfall.klinik.uni-mainz.de
Der Chirurg; Zeitschrift Fur Alle Gebiete Der Operativen Medizen
|September 21, 2004
Summary
The spiral blade interlocking nail (PHN-S) demonstrated superior biomechanical performance in unstable proximal humerus fractures compared to other implants. Elastic implant properties were found to be disadvantageous for fracture fixation.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Trauma research
Background:
- Proximal humerus fractures are commonly treated with intramedullary nails and angle-fixed plates.
- Osteoporotic bone increases the risk of implant failure with rigid fixation devices.
Purpose of the Study:
- To compare the biomechanical properties of four different fixation devices for unstable proximal humerus fractures.
- To evaluate the performance of a novel nail with spiral blade interlocking (PHN-S) against conventional implants.
Main Methods:
- Unstable surgical neck fractures were created in 24 human humeri pairs.
- Four implants were tested: PHN-K, PHN-S, T-plate, and an elastic screw internal fixator.
- Specimens underwent axial loading and torque to assess stiffness, plastic deformity, and load to failure.
Main Results:
- The PHN-S exhibited greater stiffness than the internal fixator and showed less subsidence.
- The PHN-K and T-plate demonstrated stiffness primarily under torque.
- The PHN-S achieved a higher load to failure compared to the other tested implants.
Conclusions:
- The PHN-S provides significant biomechanical advantages for treating unstable proximal humerus surgical neck fractures.
- Implants with elastic properties are not recommended for these fracture types due to biomechanical disadvantages.