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KMID : 0381219810130020027
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Journal of RIMSK
1981 Volume.13 No. 2 p.27 ~ p.32
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The Effect of the Gap Healing and Fibular Growth after Tibial Diaphysectomy in Rats
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Abstract
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Fracture healing may be modified by any exogenous and enc_ogerous factor. Authors in this experiment tried to observe the effect of the age, the degree of periosteal injury and bone loss, duration of immobilization and local stress about the fracture on the gap healing after tibial diaphysectomy. The material used for this study consisted 42 rats, which were divided into 3 groups depending upon the age. In group 1, 14 rats, aged 3 weeks. In group II, 14 rats, aged 6 weeks. In group III, 14 rats, aged 12 weeks. The length of tibial diaphysectomy was 3 times of its diameter. After diaphysectomy in each group, tibial gap was radiologically observed at immediately and 3, 5, 7, 8, 9,14 weeks.
The results obtained were the following;
In group I, bone union in 3 cases was made in 5 weeks and all but one united in 7 weeks. In group II, fractures in 4 cases united at 7 weeks and non-union in 3 cases was noted by 14 weeks, In group III, bone union was 3 cases and doubtful union was 4 cases at 9 weeks, non-union in 7 cases was noted by 14 weeks.
The younger, the more rapidly bone union was made, and bone union was retarded after cessation of the growth although the periosteum was intact.
In all group, fibular of the affected limb was hypertrophied. In group I, fibular diameter after bone union was 2. 7 times more than that of fibular at the time of diaphysectomy and 1. 8 times to unaffected side. In group II, 1.8 times to the immediate diameter and 1.5 times to unaffected side. In group III, 1.9 times to the immediate diameter and 1.6 times to unaffected side. This stress hypertrophy was discontinued after the bone union.
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