The angular deformities of tibia which developed after experimentally induced fracture in 15 rats were followed up by regular X-ray studies of 2 to 3 weeks intervals to estimate the spontaneous correctability of the deformity by growth. Also contribut...
The angular deformities of tibia which developed after experimentally induced fracture in 15 rats were followed up by regular X-ray studies of 2 to 3 weeks intervals to estimate the spontaneous correctability of the deformity by growth. Also contribution of proximal and distal tibia growth plates to longitudinal growth were extimated by same technique through this study and following data were obtained.
1. The longitudinal growth of tubular bones of rat was ceased about 11 weeks of age by the spontaneous closure of the epiphyseal plate on X-ray at this periods.
2. The iatrogenically induced angular deformity was spontaneously corrected about 45% of its total deformity during 4 to 11 weeks of age, and maximum correction was obtained during 1-3 weeks after fracture. During this periods, 62.3% of total correction was obtained.
3. The posterior angulation was better corrected than anterior one.
4. The maximum tibial growth was occured in 4-6 weeks of age and about 77.5% of total tibial length was due to the growth of the proximal epiphyseal plate.
5. The daily growth of tibia during 4-6 weeks of age was 0.02㎜/day, 0.14㎜/day in 6-8 weeks and 0.09㎜/day in 8-11 weeks.
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