Abstract
The work aimed to evaluate the effectiveness of the developed distraction system based on the rod external monolateral fixation mechanisms by comparing it with the classical technique of long tubular bones distraction based on the circular multi-axial system. The study included patients with a genetically confirmed diagnosis of achondroplasia. The experimental group consisted of 14 patients who underwent surgical limb lengthening by the rod monolateral external fixator with a distraction system developed by the authors. The lengthening was performed on 28 segments of tubular bones. The majority of the experimental group patients achieved the lengthening value close to the planned one and the deformation correction. The fixation period was averagely 83.8 ± 3.7 days, the regenerate length was 8.5 ± 0.6 cm, and the mechanical strength of the distraction regenerate was 10.3° ± 2.18°. The rod external fixator with a control distraction system developed by the authors has small dimensions and low weight of the external supporting elements of high durability. It is reported to provide a good psychological tolerance of the treatment process and significantly outperforms the circular multi-axis system. Considering the aforementioned, the proposed apparatus can grant good orthopedic care to patients with achondroplasia.
Highlights
The work aimed to evaluate the effectiveness of the developed distraction system based on the rod external monolateral fixation mechanisms by comparing it with the classical technique of long tubular bones distraction based on the circular multi-axial system
Mechanical stability of the distraction regenerate ranged from 7° to 15°, on average, 10.3 ± 2.18°
The fixation time in the apparatus before the maturation of the distraction regenerate did not exceed that for other types of apparatuses of external fixation when applying the rod external fixator with an advanced distraction s ystem[20,22,23,24]
Summary
The work aimed to evaluate the effectiveness of the developed distraction system based on the rod external monolateral fixation mechanisms by comparing it with the classical technique of long tubular bones distraction based on the circular multi-axial system. The experimental group consisted of 14 patients who underwent surgical limb lengthening by the rod monolateral external fixator with a distraction system developed by the authors. The rod external fixator with a control distraction system developed by the authors has small dimensions and low weight of the external supporting elements of high durability. Considering the aforementioned, the proposed apparatus can grant good orthopedic care to patients with achondroplasia. Achondroplasia is defined as a genetically determined systemic disease of the skeleton in children with a predominantly impaired endochondral growth of long and short tubular bones. The decision to increase the height in patients diagnosed with this skeletal disorder is specified mostly by the need to lengthen the limbs in order to restore the normal proportions between the torso and limbs, as well as facilitate self-care, for personal and social r ehabilitation[2,3]
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