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Case Report

A Case of Synovial Chondromatosis of Temporomandibular Joint with Numerous Loose Bodies

Yumiko Matsusue ,

1,2

Kazuhiko Yamamoto,

1

Nobuhiro Yamakawa,

1

Ikumi Yamamoto,

1

Shinpei Matsuda,

3

Hitoshi Yoshimura,

3

Tetsuji Kawakami,

1,2

and Tadaaki Kirita

1

1Department of Oral and Maxillofacial Surgery, Nara Medical University, Japan

2Department of Oral and Maxillofacial Surgery, Takita Hospital, Japan

3Department of Dentistry and Oral Surgery, Unit of Sensory and Locomotor Medicine, Division of Medicine, Faculty of Medical Science, University of Fukui, Japan

Correspondence should be addressed to Yumiko Matsusue; yumikoch@naramed-u.ac.jp Received 7 September 2021; Accepted 2 November 2021; Published 11 December 2021 Academic Editor: Rui Amaral Mendes

Copyright © 2021 Yumiko Matsusue et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Here, we report a case of synovial chondromatosis of the temporomandibular joint (TMJ) with numerous loose bodies. A 56-year- old woman was examined in the oral surgery department for trismus and pain in the left TMJ when opening the mouth. Imaging indicated TMJ synovial chondromatosis, and the patient was referred to our department for further examination. Her facial features were symmetrical, and no occlusal abnormalities were found. The maximum mouth opening was 30 mm, and movement of the left mandibular condyle was restricted and accompanied by pain and joint sounds. Panoramic radiography showed deformation of the left mandibular condyle and radiopaque lesions surrounding it. Computed tomography showed numerous small granules around the left mandibular condyle, some of which were calcified. Magnetic resonance imaging showed anterior disc displacement without reduction in the left TMJ and hypointense lesions on T2-weighted images. Bone scintigraphy showed an accumulation in the area of the left TMJ. Based on the diagnosis of the left TMJ synovial chondromatosis, the lesions were removed, and plastic surgery on the mandibular condyle was performed under general anesthesia. We removed 386 white loose bodies. Histopathologically, the loose bodies were consistent with synovial chondromatosis lesions. The postoperative course was uneventful, with no recurrence or TMJ dysfunction approximately 5 years after the surgery, indicating that open surgery is the best course of intervention in such cases.

1. Introduction

Synovial chondromatosis is a benign disease in which syno- vial cells create cartilaginous metaplasia in synovial tissue, resulting in loose cartilage bodies in the joint cavity. The most common sites include the knee, elbow, and hip. Syno- vial chondromatosis of the temporomandibular joint (TMJ) was first described by Von Haller in 1764 [1]. Synovial chon- dromatosis is not frequently encountered in the TMJ, but reports of such cases have increased along with recent advances in diagnostic imaging, including magnetic reso- nance imaging (MRI). Here, we report a case of TMJ syno- vial chondromatosis with numerous loose bodies to draw attention to this rare condition and suggest a suitable course

of action for its treatment. We also review the related litera- ture of reported TMJ synovial chondromatosis cases.

2. Case Presentation

A 56-year-old woman presented to our department with a chief complaint of pain in her left TMJ in December 2014.

Around November 2012, the patient had noticed pain in her left TMJ when widely opening her mouth, but the symp- toms disappeared, and she did not address the matter.

Around July 2014, the symptoms recurred, and she began experiencing trismus. She visited the dental and oral surgery department at a hospital for examination. Both computed tomography (CT) and MRI indicated synovial chondromatosis

https://doi.org/10.1155/2021/5927215

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of the TMJ, and she was referred to our department for treatment.

Clinical examination found that she had a fairly healthy physique and no signs of nutritional de ficiency. There was no visible facial deformation, and the maximum mouth opening was 30 mm. Movement of the left mandibular con- dyle was poor, and there was pain as well as joint sounds when widely opening the mouth but no occlusal abnormality (Figure 1).

Panoramic radiography showed that the left mandibular condyle was flattened, with a radiopaque image near the superior joint cavity (Figure 2). The TMJ radiograph also showed deformation in the left mandibular fossa. With mouth opening, both mandibular condyles were able to move to near the lowest point of the articular eminence.

CT showed that the left mandibular condyle was flattened, and small and granular nodules were observed in the joint capsule of the left TMJ, some of which were calci fied (Figure 3).

T1-weighted MRI of the left TMJ showed deformity of the left mandibular condyle and anterior disc displacement without reduction, and T2-weighted MRI showed fine nod- ular areas of hypointensity in the superior joint cavity (Figures 4(a)–4(c)). Bone scintigraphy showed accumulation at an area matching the left TMJ (Figure 4(d)). Based on these findings, the final diagnosis was of left synovial chon- dromatosis of the TMJ.

Approximately 2 months after the initial examination, the masses were removed, and plastic surgery was performed on the mandibular condyle under general anesthesia. Incision lines were set according to the Al-Kayat–Bramley method [2]. The skin incisions were made, detaching up to the tempo- ral fascia. An incision was made in the superficial temporal fascia, then in between the superficial and deep layers to the zygomatic arch, where the periosteum was incised to expose the joint capsule. The joint capsule was punctured, and approximately 2 mL of slightly viscous synovial fluid was col- lected. Incising the joint capsule revealed numerous white loose bodies around the mandibular condyle and in the supe- rior joint cavity. The loose bodies were not adherent to the sur- rounding tissue and were carefully removed.

Although the articular disc was preserved, the mandibu- lar condyle was deformed. Therefore, plastic surgery of the mandibular condyle was performed using an ultrasonic cut- ting instrument (Piezosurgery®, Mectron Medical Technol- ogy, Carasco, Italy). A closed drain was placed in the wound, and the incision was sutured to complete the opera- tion (Figure 5).

At the time of writing, it has been more than 5 years since the surgery. There have been no signs of local recur- rence or trismus. Image findings have also not indicated any recurrence (Figures 6 and 7).

The loose bodies removed were 2 to 5 mm in diameter, white, bone-like, hard, and numbered 386 in total (Figure 8).

Histopathologically, there was proliferation of cartilage tissue with chondrocytes forming round or irregular small masses surrounded by fibrous tissue, along with fibrosis and ossi fication. There were no signs of malignancy, which is consistent with synovial chondromatosis (Figure 9).

3. Discussion

In this report, we presented the case of a patient with TMJ synovial chondromatosis with numerous loose bodies who was successfully treated with surgery and has remained symptom free 5 years after the operation. Synovial chondro- matosis of the temporomandibular joint presents with clini- cal symptoms similar to TMJ disorder, including trismus, restricted movement of the TMJ, pain, and noise [3, 4].

Thus, patients are sometimes treated for TMJ disorder for an extended period rather than receiving proper treatment [5]. Imaging is essential for diagnosing this disease, but

Figure 1: Facial photograph from the first examination. There is no visible facial deformation.

Figure 2: Panoramic radiograph from the first examination. The left mandibular condyle is flattened, and radiopaque images are seen near the superior joint cavity.

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simple radiography often does not show any changes. CT depicts joint and soft tissue swelling, multiple calcifications in a joint, or hardening and resorption of joint surfaces, but lesions may not be depicted in the absence of obvious calci fication or bone changes. MRI shows enlargement of the joint cavity, synovial fluid retention, and a swollen joint capsule with multiple hypointense masses in T2-weighted images [6–8]. Diagnosis is relatively easy in cases with numerous calcifications, such as the present one, but when these are not visible, diagnosis can be complicated. There- fore, both CT and MRI should be used to ensure a compre- hensive diagnosis incorporating all clinical findings [9–11].

This condition must be differentiated from other possible diagnoses such as TMJ internal derangement, tuberculous arthritis, osteochondrosis ossi ficans, osteochondral fracture, and pseudogout [12]. If accompanied by intracranial pro- gression [13], conditions such as meningioma, schwannoma, chondrosarcoma, lymphoma, and cholesteatoma should be considered [4].

Milgram [14, 15] classified synovial chondromatosis of the knee, elbow, and hip into three stages and considered it a self-limited disease that progresses from stages 1 to 3 in this order. In stage 3, synovectomy is not necessary if the loose bodies are removed, and even in stage 2, synovectomy is not always required. Gerard et al. [16] classi fied the disease into four stages of histopathological changes in synovial activity. They recommend expansion surgery in the early stages and reduction surgery in the late stages of synovial

chondromatosis. Our case presented as stage 3 according to Milgram’s classification and stage 2 according to Gerard’s classification. By carefully removing as many of the numer- ous loose bodies as possible and performing plastic surgery of the mandibular condyle, we minimized postoperative dys- function, indicating that this intervention was appropriate.

We located 202 case reports of TMJ synovial chondro- matosis, including the present one, published from 2009 to 2019 [7, 11, 17 –58] (Table 1). The cases covered a wide age range from 15 to 86 years and included 144 women and 58 men. The clinical symptoms were swelling in 60 cases, pain in 104 cases, trismus in 97 cases, and joint sounds in 67 cases. All patients were examined at a medical institu- tion for these symptoms. Approximately 90% of patients had open surgeries, but approximately 10% had arthroscopic surgeries. In addition to removing the lesions, resection arthroplasty was performed in 14 cases, mandibular plastic surgery or resection in 8 cases, discectomy in 11 cases, and synovectomy in 12 cases. Conservative surgery was selected if the surrounding tissue was normal. Loose bodies were found in most cases, but ours was the only one where more than 300 loose bodies were removed.

The therapy for TMJ synovial chondromatosis is princi- pally surgical intervention, as the number of loose bodies increases or the symptoms worsen [59]. If the loose bodies are con fined to the superior joint space, arthroscopic surgery can be selected, although some studies have reported recur- rence after arthroscopic surgery [60]. If the goal is de finite

(a) (b)

(c) (d)

Figure 3: CT images from first examination: (a) axial image, (b) coronal image, and (c, d) 3D image. Deformation of the left mandibular condyle is seen, with many small, granular nodules in the area of the left TMJ, some of which are calcified.

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(a) (b)

(c) (d)

Figure 4: MR image and bone scintigraphy from the first examination. (a, b) T1-weighted image; (c) T2-weighted image. In the left TMJ, T1-weighted images show deformity of the left mandibular condyle and anterior disc displacement without reduction, and T2-weighted images show areas of small, nodular hypointensity around the left mandibular condyle. (d) Bone scintigraphy. An accumulation is seen in the area of the left TMJ.

(a) (b)

Figure 5: Intraoperative findings: (a) skin incision line (arrowhead); (b) numerous white loose bodies exposed after incision of the joint capsule.

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Figure 6: Panoramic radiograph approximately 2 years after the surgery. There are no findings suggesting recurrence.

(a) (b)

(c) (d)

Figure 7: CT and MR images approximately 2 years after the surgery: (a, b) CT images—(a) axial image and (b) coronal image; (c, d) MR images, T1-weighted image. None of the images suggest recurrence.

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Figure 8: Extracted specimens. A total of 386 white, bone-like, hard, loose bodies of 2–5 mm in diameter were removed.

I II

(a) (b)

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Figure 9: Histopathological findings: (a) hematoxylin-eosin staining ×1.25, low magnification; (b) hematoxylin-eosin staining ×200, high magnification of AI; (c) hematoxylin-eosin staining ×200, high magnification of AII. Cartilage tissue with growth of chondrocytes forming round or irregular small masses surrounded byfibrous tissue. Fibrosis and ossification are observed in some areas.

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Table1:Summaryofdatafromthestudiesincludedinthereview,2009through2019. No.FirstauthorYearNo.of casesAgeSexSiteClinicalmanifestationsImaging Loose bodiesNo.Size (mm)

Treatments (otherthansynovialchondrectomy)Remarks SwellingPainLJOCrepitationCTMRICBCTArthrotomyCondylectomyDiscectomySynovectomySuchas arthroscopy 1Peng[17]2009158FR++++——++ 2Cai[18]2009121FL++(28mm)++75×8——Only arthroscopy 3Balasundaram [19]2009182ML++(35mm)——+——NLNLNLNL 4Zha[20]2009144ML++++++90-95NL——+ 5Sato[21]2010174FL+++(35mm)++1801-5——Arthroscopy 6Goizueta- Adame[22]2010115FL++(29mm)++——+——Osteotomyof thezygomatic arch 7Goizueta- Adame[22]2010174FL++(14mm)++——+—— 8Boffano[23]2010155FR++++——<6<5——+ 9Pimentae Souza[24]2010128MR+——++——10NLNLNLNLNL 10Guarda- Nardini[25]2010153FR+++(20mm)X-Ponly——210-25NLNLNLNL 11Cai[26]2010148FL+++316×9——Only arthroscopy 12González- Pérez[27]2010150ML+++(20mm)+++352-10+—— 13Shah[28]2011125FL+——+——43<1:5×2:5——++ 14Mori[29]2011152FL+-(48mm)++——NVS—— 15Lim[30]2011149MR+++(27mm)++——NVS—— 16Chen[31]2011150ML+++(28mm)——+NVS+——Arthroscopy 17Guijarro- Martínez[32]2011138FB+-(40mm)——+NNL—— 18Matsumura [33]2012146MR——+(24mm)++++NL++Aspiration biopsy 19Matsumoto [34]2013134FR——-(42mm)++++NNL——Assistedwith arthroscopy 20Coleman[35]2013163FL+——++——+——Aspiration biopsy 21Valentini[36]2013160FL++——++—— 22Sink[37]2014182ML——-(40mm)——+——Aspiration biopsy 23Pau[38]2014170MR+++++——+——Reconstruction ofthecranial base 24Cascone[39]2914130ML+——+1120-30——+ 25Pinto[40]2015154FL+++(20mm)++11<10—— 26Ivask[41]2015145FL++(38mm)++——N3-10+——Arthroscopy 27Sozzi[42]2015168FR+++(20mm)+++NVS——

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Table1:Continued. No.FirstauthorYearNo.of casesAgeSexSiteClinicalmanifestationsImaging Loose bodiesNo.Size (mm)

Treatments (otherthansynovialchondrectomy)Remarks SwellingPainLJOCrepitationCTMRICBCTArthrotomyCondylectomyDiscectomySynovectomySuchas arthroscopy 28Yoshitake[43]2016172MR+++(30mm)++—— 29Selvi[44]2016145FR+++(24mm)——+NNL++Arthroscopy, arthroplasty, eminectomy 30McCaffery [45]2017134MR+——++——+——Osteotomyof thezygomatic arch 31Khanna[46]2017143ML++++—— 32Khanna[46]2017135MR++++++NL——Osteotomyof thezygomatic arch 33Kim[47]2017126FR+——+++2—— 34Kim[47]2017131FL+-(45mm)+++7-10—— 35Kim[48]2018150ML++——++120Small—— 36Holtmann [49]2018163FR++——++2514×6VS—— 37Matsuda[50]2019173FL++——++44VS——∗1 38Tang[51]2019160FR+——+—— 39Tang[51]2019138FR++(25mm)+++NL—— 40Tang[51]2019130FL+++(28mm)+++NL—— 41Meng[52]20102044.0 (32- 67)

8/ 1212/ 7/11317145151340>NVS829Arthroscopy:1 42Wang[11]20122245.3 (17- 64)

7/ 15

12/ 10/ 0NLNLNLNL22NLNLNLNLNLNL 43Cai[53]20163343.0 (21- 62)

7/ 26

18/ 15/ 032016/ 30.5mm(15- 55mm)18433N0.5-16——

Only arthroscopy:32 Assistedwith arthroscopy:1 44Liu[7]20161047.2 (31- 67)2/82/ 8/077751962NL—— 45Bai[54]20173648.11 (29- 65)

11/ 25

14/ 22/ 0NLNL229363642NL——Assistedwith arthroscopy:36 46Brabyn[55]2018642.0 (33- 57)0/60/ 6/02232.3mm (20-46mm)455620.5-3.0—— 47Maa[56]2019648.6 (30- 61)2/42/ 4/0565366NLNL——6 48Lee[57]20191632.68 (19- 49) 2/ 147/ 9/0104821540- 1000.5-6.5——Only arthroscopy:16

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Table1:Continued. No.FirstauthorYearNo.of casesAgeSexSiteClinicalmanifestationsImaging Loose bodiesNo.Size (mm)

Treatments (otherthansynovialchondrectomy)Remarks SwellingPainLJOCrepitationCTMRICBCTArthrotomyCondylectomyDiscectomySynovectomySuchas arthroscopy 49Benslama[58]20191250.5 (43- 86)4/83/ 9/041062262-30VS——Assistedwith arthroscopy:1 50Presentcase2020156FL++(30mm)+++3862-5++——

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cure, we believe that open surgical resection is the best option.

Synovial chondromatosis is characterized by multiple chondrodysplasia or osteochondrodysplasia and free body formation in a joint due to synovial metaplasia, but its underlying pathological mechanism remains unclear. Possi- ble triggers are trauma and continuous irritation to the syno- vial membrane [61]. Trauma is considered to lead to the production of cartilage from secondary synovial changes, while continuous stimulation may trigger cartilage forma- tion from synovial cell metaplasia due to internal joint dam- age. However, our patient had no history of trauma. We believe that anterior disc displacement allows rich connec- tive tissue growth in the posterior synovium, which is chron- ically stimulated by the mandibular condyle. Although the molecular mechanism of this disease is not understood, immunohistochemical studies of loose bodies from synovial chondromatosis have found expression of fibroblast growth factor-2 and fibroblast growth factor receptor-1 in chondro- cytes, suggesting their involvement in the pathology [62, 63].

In a study of synovial tissue from TMJ synovitis, interleukin- 1β and tumor necrosis factor α were expressed in both the synovial cell layer and the vascular wall [64, 65]. These reports indicate that the onset of this disease is influenced by a mechanism involving inflammatory cytokines and other substances produced by the synovial membrane or microvascular disorders that regulate the growth and activity of synovial cells against a background of genetic or environ- mental factors [66, 67]. However, in addition to the above factors, various cytokines, growth factors, pain-producing substances, and other substances involved in inflammation and cell proliferation are known to be expressed in the syno- vial fluid and synovial cells of the TMJ [65, 68]. Clarifying the locations and effects of these substances could help pro- vide diagnostic indicators for the diagnosis of this type of synovial chondritis and its pathological progression.

The prognosis of this disease is relatively good, and recurrence is uncommon. However, because of reports of malignant transformation to chondrosarcoma in other joints [6, 69, 70], we plan to continue to follow-up this patient.

In conclusion, we reported a rare case of TMJ synovial chondromatosis with 386 loose bodies, which were removed using open surgery. There has been no recurrence in the 5- year follow-up period, indicating that open surgery is the best course of intervention in such cases.

Conflicts of Interest

The authors declare no conflicts of interest to disclose regarding this paper.

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