The Application Value Of Doppler Ultrasound In Evaluation Of The Optimal Lengthen Rates In Limb Lengthening

Objective : To explore the application value of Doppler ultrasound in the evaluation of limb lengthening in order to find out the optimal lengthen rates.Methods : Thirty New Zealand white rabbits were randomly divided into 3 groups(n=10). In the low lengthening speed group (A group),Lengthening was initiated on an average of 7 days after osteotomy at a rate of 0.25 mm 2 times a day at the distraction site.While the normal lengthening speed group (B group), lengthening was initiated on an average of 7 days after osteotomy at a rate of 0.50 mm 2 times a day at the distraction site and the fast lengthening speed group (C group) wear lengthened at a rate of 0.75 mm 2 times a day at the distraction site.All the animals were examined by X-ray and ultrasound weekly, respectively. All detection results were scored according to a generally accepted standard.Results and Conclusion : Ultrasound is an effective method to evaluate the limb lengthening in early stage. It can not only detect the formation and maturation of the new callus, but also can evaluate the forming speed and the quality of the new calls. Moreover, ultrasound can be used to evaluate the situation of the soft tissue near the distraction site. Complications associated with the limb lengthening can be observed timely by the ultrasound. Ultrasound is of great significance in the evaluation of distraction osteogenesis and confirmation of the best lengthening rate.