Assessing joint effusion and bone changes of the head of the mandible in MR images of symptomatic patients.
Magnetic resonance imaging (MRI) provides an excellent representation of soft tissues in anatomical and semi-functional relationships. The multi-section images it generates allow a tridimensional analysis of the temporomandibular joint (TMJ), providing the most complete assessment of the relationship between TMJ components. (1)
Examination by MRI may be used to analyze the articular disc position in the coronal and parasagittal planes, the translation movement of the head of the mandible, and the disc movement during mouth opening and closing. MRI may also be used to detect the presence of effusion, bone erosions and degenerative diseases. (2,3)
Joint effusion (JE) is generally defined as a pathological collection of fluid in articular spaces. It appears in MR images as high signal intensity in the TMJ space, observed on T2-weighted images. It often appears accompanied by disc displacement (DD) and by pathological changes, such as inflammatory processes or synovitis, and is considered a very useful indicator in assessing the progression and severity of temporomandibular dysfunction (TMD). (4)
Degenerative bone changes of the TMJ are significantly more frequent in the head of the mandible than in the articular eminence, and are characterized by the development of osteophytes, erosions, avascular necroses, subchondrial cysts and intra-articular foreign bodies. (4,5) These changes are considered radiological signs of osteoarthritis (OA), and have been observed in symptomatic TMJs. (5,6)
If a strong association between the presence of JE and OA were to be established, this could be the basis for valuable additional diagnostic information. The aim of this study was thus to investigate the relationships between OA in the head of the mandible and the presence of JE, by analyzing MR images of the TMJs of symptomatic patients.
MR images of 148 TMJs from 74 adult patients submitted to this examination after indication by their dentists or physicians were used. The images were retrieved from the archives of a private institution. The inclusion criterion was the presence of at least one sign or symptom of TMD reported during clinical examination. Patients who reported any systemic involvement or who were using medication that could entail bone changes were disregarded.
The exams were performed with a Signa apparatus (GE Medical Systems, Madison, USA) with 1.5 Tesla field strength, using T2 and PD weighted sequences, with the aid of a double surface coil 20 cm in diameter (GE Medical Systems, Madison, USA). The images were obtained in the sagittal plane with 3-mm-thick cuts, saved in DICOM format and evaluated by two experienced radiologists (a physician and a dentist). Each of them evaluated the images only once and the resulting reports were obtained by consensus.
The mandible heads were surveyed for OA characteristics, which were classified as osteophytosis, sclerosis or erosion.
The presence of JE was checked in the T2-weighted images whenever high signal intensity was observed in the articular space (Figure 1).
The study was approved by the Research Ethics Committee, University of Sao Paulo, under protocol 119/2009.
The conditions assessed were recorded as present or absent, and then submitted to descriptive statistics. The data regarding gender, OA of the mandible head and presence of JE were analyzed through absolute and relative frequency calculation, and then plotted in charts. Following the descriptive analysis, Fisher's exact test was performed to ascertain whether the OA characteristics of the mandible heads were associated with the presence of JE, at a significance level of 5% (P < 0.05). The statistical analyses were conducted with Statistical Package for Social Sciences software (SPSS for Windows, version 11.0, Chicago, USA).
From the 74 patients evaluated (148 TMJs), 51 (68.9%) were female, and 23 (31.1%) were male. The mean age of female patients was 40.4 [+ or -] 14.5 years (range: 13-69 years). The mean age of male patients was 35.9 [+ or -] 11.2 years (range: 17-58 years).
The TMJs were assessed bilaterally for the occurrence of OA and JE. OA characteristics were observed in 30% of the samples (Figure 2), the most frequent of which were osteophytosis (n = 13, 9%) and sclerosis (n = 8, 5%); erosion was the least frequent change observed (n = 1, 1%). The OA characteristics observed were associated, as follows:
* erosion and osteophytosis (n = 8, 6%);
* erosion, sclerosis and osteophytosis (n = 6, 4%);
* erosion and sclerosis (n = 5, 3%); and
* sclerosis and osteophytosis (n = 3, 2%).
JE was observed in 10% of the samples, as shown in Figure 3.
Table 1 illustrates the descriptive analysis of the association between OA characteristics and the presence of JE.
The results of the statistical tests revealed that the OA characteristics of the head of the mandible were associated with the presence of JE (p = 0.006). Subjects with JE on at least one side presented the same OA profile (p = 0.835). Subjects with no JE on either side presented a higher rate of TMJs with no OA, on both sides, when compared to patients with JE on at least one side (p = 0.048).
MRI is considered a choice method to assess the soft components of joints, as well as changes in the quantity of articular fluid. (5,7)
The present study assessed the relationship between mandibular condyle OA and the presence of JE. MRI is a reliable method to detect JE. (8) Bone changes may be assessed by viewing the TMJ in the position used in this examination with an accuracy of 93%. (3)
The inclusion criterion was the presence of pain in the TMJ or in the neighboring temporal, frontal or auricular regions. Studies found in the related literature show a strong correlation between TMJ pain, disc displacement and JE. (6,9) Pain persisting after TMJ arthrocentesis is generally related to a great amount of JE and erosive condylar OA. (9) There are, however, several studies showing a weak correlation between JE and TMJ pain. (10,11) Furthermore, JE has also been detected in asymptomatic TMJs, with no observable pathology. (12)
We also observed a predominance of female over male subjects, an observation consistent with a tendency reported in the related literature. (5,6,13,14)
Osteoarthritis, on the other hand, was observed in 30% of the samples, which is in agreement with other studies stating that bone abnormalities are not always related to symptom reports by patients. (5,9) We also observed that the condylar OA characteristics were associated, predominated by the erosion/osteophyte combination. This finding is corroborated by a study reporting a higher frequency of osteophytes and erosions combined. (5)
JE was found in 10.1% of subjects, which agrees with the findings of another study reporting this same percentage in symptomatic patients. (12) The minute size of the intra-articular space and the similarity between the synovial liquid and the JE signals on MR images make it difficult to distinguish these signals. Furthermore, there is no consensus on the amount of fluid that would be involved in safely characterizing a JE. (2) The criterion used in our study to make the distinction between effusion and synovial liquid was high signal intensity in the intraarticular space in T2-weighted images. No quantitative analysis of fluids was performed; only the presence or absence of JE was detected.
The statistical results showed that condylar OA characteristics were associated with the presence of TMJ effusion (p = 0.006). However, JE was also observed in normal TMJs. Hence, additional data may be necessary to confirm this relationship and to ascertain whether OA characteristics are initial or contributing factors in the onset of JE.
According to the results obtained in this study, the incidence of JE was correlated to OA characteristics of the head of the mandible. Erosions and osteophytes were the most frequently observed mandibular condyle OA characteristics. However, most symptomatic patients evaluated showed neither bone alterations nor signal intensity consistent with joint effusion.
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Jefferson Xavier de Oliveira
Jucely Aparecida da Rosa
Marcelo Eduardo Pereira Dutra
Karina Cecilia Panelli Santos
Discipline of Dental Radiology, Department of Stomatology, School of Dentistry, Univ de Sao Paulo--USP, Sdo Paulo, SP, Brazil.
Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.
Jucely Aparecida da Rosa
Submitted: Jul 17, 2012
Accepted for publication: Sep 26, 2012
Last revision: Sep 29, 2012
Table 1--Distribution of subjects according to bone changes of the head of the mandible and the presence of intra-articular effusion. AA: absent on both sides; AP: absent on the right side and present on the left side; PA: present on the right side and absent on the left side; PP: present on both sides; ErS ErS: erosion and sclerosis on both sides; ErS N: erosion and sclerosis on one side and normal on the other side; ErSO S: erosion, sclerosis and osteophytosis on one side and sclerosis on the other side; ErSO N: erosion, sclerosis and osteophytosis on one side and normal on the other side; ErSO O: erosion, sclerosis and osteophytosis on one side and osteophytosis on the other side; ErO ErO: erosion and osteophytosis on both sides; ErO S: erosion and osteophytosis on one side and sclerosis on the other side; ErO N: erosion and osteophytosis on one side and normal on the other side; ErO O: erosion and osteophytosis on one side and osteophytosis on the other side; S S: sclerosis on both sides; SO S: sclerosis and osteophytosis on one side and sclerosis on the other side; SO N: sclerosis and osteophytosis on one side and normal on the other side; N Er: normal on one side and erosion on the other side; N S: normal on one side and sclerosis on the other side; N N: normal on both sides; N O: normal on one side and osteophytosis on the other side; O O: osteophytosis on both sides. Bone change Intra-articular effusion status status A A A P P A P P ErS ErS 1 (1.6%) -- -- -- ErS N 3 (4.8%) -- -- -- ErSO S -- 1 (20.0%) -- -- ErSO N 2 (3.2%) -- 1 (50.0%) 1 (25.0%) ErSO O -- -- 1 (50.0%) -- ErO ErO 1 (1.6%) -- -- -- ErO S -- -- -- 1 (25.0%) ErO N 4 (6.3%) -- -- -- ErO O 1 (1.6%) -- -- -- S S 2 (3.2%) -- -- -- SO S -- 1 (20.0%) -- -- SO N 2 (3.2%) -- -- -- N Er -- -- -- 1 (25.0%) N S 1 (1.6%) -- -- -- N N 39 (61.9%) 2 (40.0%) -- 1 (25.0%) N O 4 (6.3%) 1 (20.0%) -- -- O O 3 (4.8%) -- -- -- Total 63 (100.0%) 5 (100.0%) 2 (100.0%) 4 (100.0%) Bone change Total status ErS ErS 1 (1.4%) ErS N 3 (4.1%) ErSO S 1 (1.4%) ErSO N 4 (5.4%) ErSO O 1 (1.4%) ErO ErO 1 (1.4%) ErO S 1 (1.4%) ErO N 4 (5.4%) ErO O 1 (1.4%) S S 2 (2.7%) SO S 1 (1.4%) SO N 2 (2.7%) N Er 1 (1.4%) N S 1 (1.4%) N N 42 (56.8%) N O 5 (6.8%) O O 3 (4.1%) Total 74 (100.0%) Figure 2--Distribution of TMJs according to bone changes of the head of the mandible. Er 1 ErS 5 ErSO 6 ErO 8 S 8 SO 3 N 104 O 13 Er: erosion ErS: erosion and sclerosis ErSO: erosion, sclerosis and osteophytosis ErO: erosion and osteophytosis S: sclerosis SO: sclerosis and osteophytosis N: normal O: osteophytosis Note: Table made from bar graph. Figure 3--Distribution of TMJs according to JE presence. Present 15; 10.1% Absent 133; 89.9% Note: Table made from pie chart.
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|Title Annotation:||Oral Radiology|
|Author:||de Oliveira, Jefferson Xavier; da Rosa, Jucely Aparecida; Dutra, Marcelo Eduardo Pereira; Santos, Ka|
|Publication:||Brazilian Oral Research|
|Date:||Jan 1, 2013|
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