The Grouping Research In Femoral Neck Anteversion Rectification In The Therapy Of Children With Developmental Dislocation Of The Hip

Objective: Observes 3DCT phantom material of children with Deve- lopmental Dislocation of the Hip .Discusses the best angle number of children with the different dislocation degree and the different age degree during the surgery to instruct the surgery operates .Materials and methods: There were 69 children(altogether 99hips) with DDH Collected from Mar 2005 to Mar 2008 in our hospital,and their ages ranged from 1 to 12 years (on average 3 years and 10 months), and 51 left hips,48 right hips,61 female and 8 male. There were 16 normal children with 20 normal hips as normal control groups to study the changes of fe- moral neck anteversion between prior-operation and post-operation,and difference between normal and after operation groups.①Select 31 child- ren(61hips) with DDH whose prior-operation and post-operation CT datum were in their integritiy, and their ages ranged from 2 to 8 years (on average 33 months), and 31 left hips,30 right hips,27 female and 4 male. They were devided into prior-operation and post-operation groups. According to the dislocation degree and Dunn minute, devided the prior-operation and post-operation groups into I°group 37 hips;Ⅱ°group 13 hips;Ⅲ°group 11 hips, surveyed the FNA and observed the different dislocation degree to correct FNA to the technique in the in- fluence.②According to the age, post-operation group was divided into 1.5~3 year old of group, 3~5 year old of group, 5~7 year old of group, above 7 years old the group. we survey the FNA before and after the ope- ration. And observed age factor corrects the FNA to the operation in the influence.③The post-operation group was divided into the both sides contrast about the FNA.④Took 69 example DDH trouble integrity prior-operation CT material(altogether 99 hips) and divided into 1.5~3 year old of group, 3~5 year old of group, 5~7 year old of group, above 7 years old the group according to the age. Observed the age to the trouble side growth situation influence.⑤Took the healthy side of DDH chil- dren altogether 38 hips to take the healthy side group and surveyed its FNA value. Divided group into 1~3 year old of group, 3~5 year old of group, 5~7 year old of group, above 7 years old group and observated age to healthy side growth situation influence.⑥The patients were examined with spiral CT(Aquilion/Multi,Toshiba CO.).The 3D Pictures were taken and the relevant measurements were made interms of SSD , MPR on an independent computer workstation.⑦Uses the SAS8.1 statistics software separately to carry on statistics examination to the data, the prior-operation and post-operation average value of FNA, the standard deviation,divided the value of FNA into the 0~4.9°, 5~9.9°, 10~14.9°, 15~19.9°, 20~24.9°, 25~30°several group sections counts FNA the distributed situation, and observes postoperation function and the X-ray performance, thus obtains an effect good FNA correction scope to use to instruct clinically. Results:①There were significant difference between prior-treatment ,post-treatment and normal groups.②There were no significant difference between left side and right side groups.③The mean FNA degree of normal side of children with DDH was higher than the normal FNA degree. And the difference was significant.④Children with contralateral FNA value increases with age was increased after the first decrease trend, but without statistical significance.⑤The FNA value of trouble side increased with age increased, and there was statistical significance.⑥T he mean FNA degree number of the post-operation group was 17.321°,ranged from 1to 31 degrees. 70.5% of the members were in the range from 11 to 25 degrees,10 cases of 0°to 10°(of which five cases of 0 ~ 5°), 43 cases of 11 ~ 25°(15 cases of 11 ~ 14.9°, 4 cases 15 ~ 19.9°, 24 cases of 20 ~ 25°), 8 cases than 26°(7 cases of 26 ~ 30°, one case of more than 30°).⑦DunnⅠ, DunnⅡ, DunnⅢtypes in the correct operation of the FNA despited differences, but without statistical significance.⑧The FNA value of post-operation group was increased after the first lower scalloped trends with age increasing, but the survey results had no significantly different.Conclusions: The FNA value of trouble side of DDH children was significantly higher than normal value. In operation, we would correct FNA to slightly higher than the normal range, rather than the normal standard. The normal side FNA value of DDH children was higher than the normal value. Trouble side FNA value increased with age increasing.The FNA degree should be correct to 11~25°scope in for good. Different ages and the extent of the dislocation had no significant effect in the operation.