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Observational Study
. 2016 Aug;95(35):e4715.
doi: 10.1097/MD.0000000000004715.

Does condylar height decrease more in temporomandibular joint nonreducing disc displacement than reducing disc displacement?: A magnetic resonance imaging retrospective study

Ying-Kai Hu  1 , Chi Yang, Xie-Yi Cai, Qian-Yang Xie
Affiliations
Observational Study

Does condylar height decrease more in temporomandibular joint nonreducing disc displacement than reducing disc displacement?: A magnetic resonance imaging retrospective study

Ying-Kai Hu et al. Medicine (Baltimore). 2016 Aug.

Abstract

The aim of the study was to compare condylar height changes of anterior disc displacement with reduction (ADDwR) and anterior disc displacement without reduction (ADDwoR) in temporomandibular joint (TMJ) quantitatively, to get a better understanding of the changes in condylar height of patients with anterior disc displacement who had received no treatment, and to provide useful information for treatment protocol. This longitudinal retrospective study enrolled 206 joints in 156 patients, which were divided into ADDWR group and ADDwoR group based on magnetic resonance imaging examination. The joints were assessed quantitatively for condylar height at initial and follow-up visits. Also, both groups were further divided into 3 subgroups according to age: <15 years group, 15 to 21 years group, and 22 to 35 years group. Paired t test and independent t test were used to assess intra- and intergroup differences. The average age of the ADDwR group was 19.65 years with a mean of 9.47 months' follow-up. The follow-up interval of the patients with ADDwoR was 7.96 months, with a mean age of 18.51 years. Condylar height in ADDwoR tended to decrease more than those in ADDwR, especially during the pubertal growth spurt and with the presence of osteoarthrosis, meaning ADDwoR could cause a severe disturbance in mandibular development. Thus, an early disc repositioning was suggested to avoid decrease in condylar height.

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Conflict of interest statement

The authors have no conflicts of interest to disclose.

Figures

Figure 1
Figure 1
Measurement of condylar height on MRI. (A) In MRI image and (B) schematic diagram. MRI = magnetic resonance imaging.
Figure 2
Figure 2
MRI scans of a 14-year-old female ADDwoR patient with the interval of 8 months, showing significant loss of condylar height and volume. (A) First visit and (B) follow-up visit. ADDwoR = anterior disc displacement without reduction, MRI = magnetic resonance imaging.
Figure 3
Figure 3
MRI scans of a 16-year-old female ADDwR patient with the interval of 21 months, showing condylar growth. (A) First visit and (B) Follow-up visit. ADDwR = anterior disc displacement with reduction, MRI = magnetic resonance imaging.
See this image and copyright information in PMC

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