Hessmann, J Trauma 2005 - Locked Plate Fixation and Intramedullary Nailing for Proximal Humerus Fractures: A Biomechanical Evaluation - Article Summary

Locked Plate Fixation and Intramedullary Nailing for Proximal Humerus Fractures: A Biomechanical Evaluation

Hessmann, Rommens, et al.·J Trauma·2005·122 citations·Biomechanical study

Background

Internal fixation of proximal humeral fractures is associated with a considerable secondary malalignment rate. Fixed-angle implants have been suggested to increase the stability of fixation.

Methods

The biomechanical properties of four different implants were tested.
These included an internal fixator with semielastic properties (reference), the Synthes T-plate, a locked plate with rigid properties, and a spiral blade locked intramedullary nail (PHN).
These implants were assessed in 24 osteotomized pairs of human cadaveric humeri.
Specimens were subjected to 200 cycles of axial loading and torque, followed by loading until failure.

Results

The PHN had greater axial stiffness than the reference and the T-plate.
During torque, all implants were stiffer than the reference.
During cyclic loading, there were no differences between the T-plate and the reference.
Both the rigid internal fixator and the PHN had less irreversible deformation than the reference.
Both implants resisted higher loads before failure.

Conclusions

This study showed that the PHN and the rigid internal fixator are stronger than the semielastic locked plate and the Synthes T-plate for unstable subcapital proximal humeral fractures.

Supplemental

Locked Plate Fixation and Intramedullary Nailing for Proximal Humerus Fractures: A Biomechanical Evaluation.

Hessmann, Rommens, et al.J Trauma2005122 citationsBiomechanical study

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Locked Plate Fixation and Intramedullary Nailing for Proximal Humerus Fractures: A Biomechanical Evaluation

Hessmann, Rommens, et al.·J Trauma·2005·122 citations·Biomechanical study

DOI·PubMed

Background

Internal fixation of proximal humeral fractures is associated with a considerable secondary malalignment rate. Fixed-angle implants have been suggested to increase the stability of fixation.

Methods

The biomechanical properties of four different implants were tested.
These included an internal fixator with semielastic properties (reference), the Synthes T-plate, a locked plate with rigid properties, and a spiral blade locked intramedullary nail (PHN).
These implants were assessed in 24 osteotomized pairs of human cadaveric humeri.
Specimens were subjected to 200 cycles of axial loading and torque, followed by loading until failure.

Results

The PHN had greater axial stiffness than the reference and the T-plate.
During torque, all implants were stiffer than the reference.
During cyclic loading, there were no differences between the T-plate and the reference.
Both the rigid internal fixator and the PHN had less irreversible deformation than the reference.
Both implants resisted higher loads before failure.

Conclusions

This study showed that the PHN and the rigid internal fixator are stronger than the semielastic locked plate and the Synthes T-plate for unstable subcapital proximal humeral fractures.

Background

Internal fixation of proximal humeral fractures is associated with a considerable secondary malalignment rate. Fixed-angle implants have been suggested to increase the stability of fixation.

Methods

The biomechanical properties of four different implants were tested.
These included an internal fixator with semielastic properties (reference), the Synthes T-plate, a locked plate with rigid properties, and a spiral blade locked intramedullary nail (PHN).
These implants were assessed in 24 osteotomized pairs of human cadaveric humeri.
Specimens were subjected to 200 cycles of axial loading and torque, followed by loading until failure.

Results

The PHN had greater axial stiffness than the reference and the T-plate.
During torque, all implants were stiffer than the reference.
During cyclic loading, there were no differences between the T-plate and the reference.
Both the rigid internal fixator and the PHN had less irreversible deformation than the reference.
Both implants resisted higher loads before failure.

Conclusions

This study showed that the PHN and the rigid internal fixator are stronger than the semielastic locked plate and the Synthes T-plate for unstable subcapital proximal humeral fractures.

Background

Internal fixation of proximal humeral fractures is associated with a considerable secondary malalignment rate. Fixed-angle implants have been suggested to increase the stability of fixation.

Methods

The biomechanical properties of four different implants were tested.
These included an internal fixator with semielastic properties (reference), the Synthes T-plate, a locked plate with rigid properties, and a spiral blade locked intramedullary nail (PHN).
These implants were assessed in 24 osteotomized pairs of human cadaveric humeri.
Specimens were subjected to 200 cycles of axial loading and torque, followed by loading until failure.

Results

The PHN had greater axial stiffness than the reference and the T-plate.
During torque, all implants were stiffer than the reference.
During cyclic loading, there were no differences between the T-plate and the reference.
Both the rigid internal fixator and the PHN had less irreversible deformation than the reference.
Both implants resisted higher loads before failure.

Conclusions

This study showed that the PHN and the rigid internal fixator are stronger than the semielastic locked plate and the Synthes T-plate for unstable subcapital proximal humeral fractures.