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. 2011 Oct;21(7):539-543.
doi: 10.1007/s00590-010-0747-9. Epub 2011 Jan 5.

Biplane double-supported screw fixation (F-technique): a method of screw fixation at osteoporotic fractures of the femoral neck

Orlin Filipov  1
Affiliations

Biplane double-supported screw fixation (F-technique): a method of screw fixation at osteoporotic fractures of the femoral neck

Orlin Filipov. Eur J Orthop Surg Traumatol. 2011 Oct.

Abstract

The present work introduces a method of screw fixation of femoral neck fractures in the presence of osteoporosis, according to an original concept of the establishment of two supporting points for the implants and their biplane positioning in the femoral neck and head. The provision of two steady supporting points for the implants and the highly increased (obtuse) angle at which they are positioned allow the body weight to be transferred successfully from the head fragment onto the diaphysis, thanks to the strength of the screws, with the patient's bone quality being of least importance. The position of the screws allows them to slide under stress with a minimal risk of displacement. The method was developed in search of a solution for those patients for whom primary arthroplasty is contraindicated. The method has been analysed in relation to biomechanics and statics. For the first time, a new function is applied to a screw fixation-the implant is presented as a simple beam with an overhanging end.

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Figures

Fig. 1
Fig. 1
Radiography. a A–P view; b Lateral view
Fig. 2
Fig. 2
Static models of the implant. a A beam on elastic foundation; b A simple beam with an overhanging end. F load, L = length of beam; a distance between points A and B
Fig. 3
Fig. 3
Fixation of the femoral neck (scheme): a Conventional method; b The BDSF method
See this image and copyright information in PMC

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