Objective:To dynamically observe the change of intra-articular pressure of the hip by means of injecting 2‰Noradrenaline(NA)into the hip joint cavity

to study the effects of intra-articular pressure change on transient synovitis of hip(TSH).Methods:Fourty-eight dogs aged 2~3 months had been randomly divided into 12 groups

with four in each group All were injected 2‰NA into the hip joint an four assessments had been done.①The intra-articular pressure of hip was determined at different times.②99m TC-MDP triphasic imaging was used to observe the local blood supply of femoral head.③Pathological changes were observed to understand the disease course.④X-ray was adopted to exmine the hip.Result:Noradrenaline induced transient synovitis of hip

and synovitis resulted in the increase of intra-articular pressure of hip which was over 20mmHg and lowered to be normal with the inflammation fading away.Transient blood insufficiency was observed in femoral head

but with no putrescence.Conclusion:In transient synovitis of hip

synovitis resulted in the change of intra-articular pressure hip

which changed to be normal as the inflammation faded away;and the intra-articular pressure change would influence the blood supply in femoral head

and could canse transient blood insufficiency.