%0 Journal Article %A Behtash, Hamid %A Ameri, Ebrahim %A Mobini, Bahram %A Vahid Tari, Hossein %A Ghandhari, Hassan %A Khaki Nahad, Mohammad %T Proximal junctional kyphosis in adolescent idiopathic scoliosis following segmental posterior spinal instrumentation and fusion minimum 2 years follow-up %J Medical Journal of the Islamic Republic Of Iran %V 23 %N 3 %U http://mjiri.iums.ac.ir/article-1-93-en.html %R %D 2009 %K adolescent idiopathic scoliosis, posterior spinal fusion, proximal junctional kyphosis., %X   Abstract   Background: To evaluate proximal junctional segment changes in Adolescent Idiopathic   Scoliosis(AIS) the posterior spinal fusion and also instrumentation also and   finding of probable risk factors, were all considered in this study.   Methods: We retrospectively reviewed radiographs of 121 consecutive patients   who underwent posterior spinal fusion for AIS from T3 or below, with a mean follow-   up of 32.8 months(range,24-83). All coronal and sagittal measurements including   the proximal junctional kyphosis (PJK)angle recorded on standing anteroposterior   and lateral radiographs preoperative, early postoperative and on follow-up radiographs.   The data were analyzed using the Spss 10.0 software. Dependent(paired)   samples student t-test was used for analysis between the groups   Results: There was PJK angle above normal for the same junctional segment preoperatively in 13 patients (10.7%) and the incidence of the PJK postoperatively was   7.4% (9 patients, 7 female and 2 male), all detected until 2 years postoperation.The   mean increase in the PJK angle from pre-operation until 6 weeks postoperation was   5.9° (range,0-13°)(P=0.02) and until 2 years post operation was 14.3° (range, 2-   16°)(p=0.000). The mean proximal junctional angle increased 1.6° until 2 years postoperation in non-PJK group(n=112).   Conclusion: The prevalence of Proximal Junctional Kyphosis was low and a   silent radiographic problem. In some cases is preventable with perfect pre-operative   planning. There is no specific demographic or radiographic variables or instrumentation   types associated with developing PJK . %> http://mjiri.iums.ac.ir/article-1-93-en.pdf %P 139-147 %& 139 %! %9 Original Research %L A-10-1-75 %+ Shafa Yahyaiian Hospital, Iran university of Medical Sciences, Tehran, Iran. %G eng %@ 1016-1430 %[ 2009