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Comment
. 2017 Aug;137(8):1167-1171.
doi: 10.1007/s00402-017-2716-9. Epub 2017 Jun 30.

Biomechanics and indications for application of the method of BDSF. Answer to manuscript draft number AOTS-D- 17-00378, Letter to the Editor concerning ''Femoral neck fracture osteosynthesis by the biplane double-supported screw fixation method (BDSF) reduces the risk of fixation failure: clinical outcomes in 207 patients'' by Filipov O, Sommer C, et al. (2017) Arch Orthop Trauma Surg. Apr 8. [Epub ahead of print]

Orlin Filipov  1 , Karl Stoffel  2 , Boyko Gueorguiev  3 , Christoph Sommer  4
Affiliations
Comment

Biomechanics and indications for application of the method of BDSF. Answer to manuscript draft number AOTS-D- 17-00378, Letter to the Editor concerning ''Femoral neck fracture osteosynthesis by the biplane double-supported screw fixation method (BDSF) reduces the risk of fixation failure: clinical outcomes in 207 patients'' by Filipov O, Sommer C, et al. (2017) Arch Orthop Trauma Surg. Apr 8. [Epub ahead of print]

Orlin Filipov et al. Arch Orthop Trauma Surg. 2017 Aug.
No abstract available

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Conflict of interest statement

The authors declare that they have no conflict of interests.

Figures

Fig. 1
Fig. 1
Biomechanical testing [1]. The applied load is vertical and the femoral shaft is inclined at 16° varus inclination to resemble the physiological resultant force inclination of 16° to the vertical in a standing position, according to Bergmann et al. [2]. The femoral neck and the middle BDSF screw which is parallel to the neck axis are in a more vertical orientation. The weight-bearing capacity of the middle BDSF screw is optimal and the shearing forces are smaller than would be in a more vertical varus inclination. Schematic representation of the middle and distal BDSF screws; the proximal BDSF screw is not shown
Fig. 2
Fig. 2
Biomechanical testing [1]. The applied load is vertical and the femoral shaft is inclined at 7° varus inclination to resemble the physiological resultant force inclination of 7° to the vertical when standing on one leg, according to Bergmann et al. [2]. The femoral neck and the middle BDSF screw which is parallel to the neck axis are in a more horizontal position. The middle BDSF screw weight-bearing capacity is significantly decreased and the shearing forces are increased in this more vertical position (7°) of the femur. The obtuse distal BDSF screw now is in optimal orientation for axial weight bearing. Its bearing capacity is added to the middle BDSF screw and helps maintain constant stability. Schematic representation of the middle and distal BDSF screws; the proximal BDSF screw is not shown
Fig. 3
Fig. 3
Shearing forces
See this image and copyright information in PMC

Comment on

References

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