Influence of transphyseal pin placement on bone growth: an experimental study in pigs
2002
Gal, P. | Teyschl, O. | Fabian, P. | Bibrova, S. (Masarykova Univ., Brno (Czech Republic). Lekarska Fakulta) | Kecova, H.
The aim of this study was to determine the influence of two Steinmann pin diameters inserted in different numbers and directions into distal radial physis on longitudinal growth of this bone. Thirty two-months-old piglets were divided into groups A (n=10), B (n=5), C (n=5) and D (n=10) according to 4 different combinations of pin diameter and number of implants placed through the distal radial physis. Placement of 2 crossed Steinmann pins of 1.7 mm diameter through the distal radial physis did not influence the growth of the bone (group A). The growth of radius in animals of groups B (3 pins of 1.7 mm diameter placed), C (2 crossed pins of 2.5 mm diameter inserted) and D (3 parallel pins of 2.5 mm diameter) was significantly altered. Differences in the growth of radius in animals of groups B and C were found. Histology showed that the diameter of the implant influences the degree of ossification in the area of pin passage through the distal radial physis and thus indirectly the growth of this bone. These findings suggest that during pinning of growth plate fractures the diameter, number of pins, and insertion technique should be considered, because possible physeal damage caused by the implants can produce bone bridge formation with consequent growth disturbance.
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