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China Journal of Oral and Maxillofacial Surgery. 2017, (06)

MRI evaluation of disc status changes of anterior displacement with reduction and without reductionChinese Full Text

HU Ying-kai;YANG Chi;CAI Xie-yi;XIE Qian-yang;Department of Oral Surgery,Shanghai Ninth People’s Hospital,College of Stomatology,Shanghai Jiao Tong University School of Medicine,Shanghai Key Laboratory of Stomatology;

Abstract: PURPOSE: The aim of the study was to evaluate disc status changes of anterior disc displacement with reduction（ADDWR） and without reduction（ADDWo R）,in order to get a better understanding of the disease progress without intervention. METHODS: This longitudinal retrospective study included 217 joints in 165 patients, which were divided into ADDWR group and ADDWo R group based on magnetic resonance imaging（MRI）. The joints were assessed quantitatively for disc length and displacement distance at initial and follow-up visits. Disc morphology, which was classified into 5 types, as well as Wilkes stages were also evaluated. Paired t test and Wilcoxon signed rank test were used to assess intra-group differences and independent t test for inter-group differences using SPSS 17.0 software package.RESULTS:There were 86 joints in ADDWR group and 131 joints in ADDwo R group. The follow-up interval was 9.38 months in ADDWR group, compared to 8.54 months in ADDWo R group. Discs tended to become shorter, move further forward and distort more seriously in ADDWo R group than in ADDWR group during follow-up period. Type I disc morphology dominated in ADDw R group both at first and follow-up visits, demonstrating great value of disc repositioning.However, major disc morphology changed from type II to type IV in ADDWo R group, indicating decrease of the value of disc repositioning. CONCLUSIONS: Discs tended to become shorter, move further forward and distort more seriously,especially in ADDWo R group, which reminds TMJ surgeons to perform disc repositioning surgery as soon for ADDWo R patients with risk factors, instead of nonsurgical surgery for 6 months that may lead to serious deterioration in disc status.
Keywords：

Temporomandibular joint; Anterior disc displacement; MRI;

  • DOI：

    10.19438/j.cjoms.2017.06.006

  • Series：

  • Subject：

  • Classification Code：

    R782.6

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