EXPERIMENTAL AND THEORETICAL VALIDATION OF DOUBLE COLUMN INTERNAL FIXATION THEORY FOR DISTAL FEMORAL FRACTURES

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Abstract

Purpose of the study – to experimentally compare efficiency of lateral and bilateral (lateral and medial) plate fixation of distal femoral fractures and to validate the appropriateness of double column theory of distal femur anatomy for internal fixation for these fractures.

Material and methods. The authors performed a biomechanical study in two series on polyurethane models of right femur corresponding in dimensions to natural femur. After simulating a 33 C2 fracture type it was fixed by one lateral plate or two (lateral and medial) plates. After fixation the models were tested in six load ranges with maximal load from 20 to 120 kgf in cyclic mode.

Results. The authors obtained a significant difference in absolute values of fragments displacement amplitude depending on fixation method. In the first series of the experiment – one plate fixed on the lateral surface of the femur – under minimal load the displacement value was reported as0.3 mm and under maximal load —1.9 mm; in the second series of experiment – two plates fixed on the lateral and medial surfaces of the femur – displacement values were reported as0.35 mm and0.95 mm respectively.

 Conclusion. The presence or absence of medial support after internal fixation has a profound impact on ensuring stability in cases of comminuted fractures of distal femoral fractures. In this context the use of double column theory of distal femur anatomy for internal fixation can significantly improve the treatment outcomes for such patients. After trials of minimally invasive fixation method on anatomical specimen the described theory can be implemented into the clinical practice.

About the authors

I. G. Belenky

Pavlov First Saint Petersburg State Medical University

Author for correspondence.
Email: belenkiy.trauma@mail.ru

Igor G. Belenky – Dr. Sci. (Med.), Associate Professor of Department of Traumatology and Orthopedics 

6-8, ul. L’va Tolstogo, St. Petersburg, 197022

Russian Federation

G. D. Sergeev

Pavlov First Saint Petersburg State Medical University

Email: fake@neicon.ru

Gennady D. Sergeev — Orthopedic Surgeon, Department of Traumatology and Orthopedics 

6-8, ul. L’va Tolstogo, St. Petersburg, 197022

Russian Federation

B. A. Mayorov

Pavlov First Saint Petersburg State Medical University

Email: fake@neicon.ru

A. Mayorov — Junior Lecturer, Department of Traumatology and Orthopedics 

6-8, ul. L’va Tolstogo, St. Petersburg, 197022

Russian Federation

S. G. Semenov

Emperor Alexander I St. Petersburg State Transport University

Email: fake@neicon.ru

Sergey G. Semenov — Head of Dynamic Test Group 

9, Moskovskii pr., St. Petersburg, 190031

Russian Federation

A. V. Benin

Emperor Alexander I St. Petersburg State Transport University

Email: fake@neicon.ru

Andrey V. Benin — Head of Research Department 

9, Moskovskii pr., St. Petersburg, 190031

Russian Federation

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