• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제38권4호
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• pp.249-254
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• 2012

Bilateral coronoid process hyperplasia is a rare condition characterized by an enlarged mandibular coronoid process. The painless progressive reduction of a mouth opening is caused by coronoid process impingement on the posterior aspect of the zygomatic bone. Hyperplasia of the bilateral coronoid process leads to the restriction of a mandibular opening consequent to the impingement of the enlarged coronoid process on the temporal surface of the zygomatic bone or with the medial surface of the zygomatic arch. The process has been diagnosed as developmental hyperplasia. Otherwise, the development of the coronoid process may be associated with growth hormone. This paper describes a case of trismus caused by coronoid hyperplasia in an idiopathic short-stature patient who received growth hormone therapy by somatropin injections.

• Clinics in Shoulder and Elbow
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• 제10권2호
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• pp.199-203
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• 2007

목적: 구상돌기는 주관절의 안정성 및 기능에 매우 중요하기 때문에, 구상돌기 골절 시 정확한 골편의 평가 및 고정이 매우 중요하다. 구상돌기 골절에 대한 방사선학적 평가는 주로 주관절 측면 촬영에서 하게 되는데, 요골두와 겹치기 때문에 정확한 관찰이 어려울 수 있다. 이에 저자들은 구상돌기 골절의 평가를 위한 새로운 방사선 촬영 방법, coronoid view를 고안하여 소개하고자 한다. 대상 및 방법: coronoid view는 구상돌기 골절 중 특히 사선의 골절선을 갖는 전내측 골편을 평가하기 위하여 고안되었다. 환자를 촬영대에 대하여 직각이 되게 옆으로 앉힌 후, 환측 견관절을 45도 외전하고, 주관절을 90도 굴곡한 상태에서 촬영대 위에 팔을 놓는다. 필름은 주관절 밑에 놓고, 주관절의 직상방에서 주관절을 중심으로 방사선을 조사한다. 이 방법으로 구상돌기 골절선이 방사선과 평행이 될 수 있으며, 요골두가 겹치는 것을 피할 수 있다. 결론: coronoid view는 구상돌기 골절선이 방사선과 평행이 될 수 있으며, 요골두 음영을 피할 수 있기 때문에 구상돌기 골절의 정확한 평가에 도움이 될 것으로 판단된다. 특히 금속 나사 등의 내고정물 때문에 컴퓨터 단층촬영이 불가능한 관혈적 정복술 후 환자의 경과 관찰에 특히 유용할 것으로 판단된다.

• Imaging Science in Dentistry
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• 제35권4호
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• pp.231-234
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• 2005

Coronoid impingement can cause limitation of mouth opening. In many cases, it appears to be related to the coronoid hyperplasia. We present a case of mouth opening limitation caused by coronoid impingement on the posterior surface of the zygomatic bone without coronoid hyperplasia. The bony changes in coronoid and zygoma including surface irregularity and discontinuity of the cortex and sclerotic change of inner medullary space were noted on computed tomography (CT) scans in different level of axial planes. Through another CT scans in open mouth position could demonstrate that those bony changes were caused by the contact of both surfaces against each other. In case coronoid impingement is suspected of the many possible causes, the open mouth CT scans will be needed to reveal the direct impingement of coronoid on zygoma even without coronoid hyperplasia.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제36권4호
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• pp.168-172
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• 2014

Bilateral coronoid hyperplasia causes painless progressive trismus, resulting from coronoid process impingement on the posterior aspect of the zygomatic bone. The etiology of coronoid hyperplasia is unclear, with various theories proposed. An endocrine stimulus, increased temporalis activity, trauma, genetic inheritance and familial occurrence have all been proposed, but no substantive evidence exists to support any of these hypotheses. Multiplanar reformatting of axial scans and 3-dimensional reconstruction permit precise reproduction of the shape and size of the coronoid and malar structures, and relationships of all structures of the temporal and infratemporal fossae. This case shows remarkably increased mouth opening by coronoidectomy in a patient who complained of trismus due to hyperplasia of coronoid process.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제39권
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• pp.11.1-11.6
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• 2017

Background: This case report discusses the unusual presentation of limited mouth opening as a result of bilateral coronoid process hyperplasia. Case presentation: A 14.5-year-old male patient of white Caucasian ethnicity presented with limited mouth opening, mandibular asymmetry, and dental crowding. Investigations confirmed bilateral coronoid process hyperplasia and management involved bilateral intraoral coronoidectomy surgery under general anaesthesia, followed by muscular rehabilitation. Mouth opening was restored to average maximum opening within 4 months of surgery. Conclusion: Limited mouth opening is a common presentation to medical and dental professionals. The rare but feasible diagnosis of coronoid impingement syndrome should not be overlooked.

• 대한견주관절학회:학술대회논문집
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• 대한견주관절학회 1999년도 학술대회
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• pp.38-40
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• 1999

$\cdot$ Arthroscopic management is the effective method with acceptable results for coronoid impingement of stiff elbow contributing to the functional improvement and pain relief. $\cdot$ The functional improvement and pain relief seem to be affected by the severity of a degenerative change of the elbow joint. $\cdot$ Excision of coronoid process is required in a marked limitation of further flexion in addition to deeping of the coronoid fossa and anterior capsular release. $\cdot$ Excision of olecranon tip or posterior capsular release are effective method in severe flexion contracture.

• 대한견주관절학회:학술대회논문집
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• 대한견주관절학회 2007년도 제15차 대한견주관절학회 및 제3차 Mayo Asia Elbow Club 합동 학술대회
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• pp.153-153
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• 2007

• Journal of Oral Medicine and Pain
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• 제48권3호
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• pp.112-117
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• 2023

Coronoid process hyperplasia (CPH) of the mandible is a rare condition in which abnormal elongation of the coronoid process leads to chronic mandibular hypomobility. CPH causes impingement or impedance of the coronoid process on the inner surface of the frontal part of the zygomatic bone during mouth opening. The lack of significant symptoms makes the diagnosis difficult. Its etiology remains inconclusive despite several theories being suggested. In this report, three reviewed cases are presented. All three patients visited our clinic with limited mouth opening as the chief complaint. Standard clinical and radiographic examinations were conducted under the initial impression of temporomandibular disorders (TMDs), and restricted jaw movements were confirmed in all cases. The absence of improved signs and symptoms following conservative treatment for TMDs or the indeterminate plain radiographs required the attending clinicians to consider three-dimensional imagery. Computed tomography revealed bilateral coronoid hyperplasia in all cases and impingement on the zygomatic bone in two of the three cases. After concluding that this condition caused the patients' limited mouth opening, the patients were referred to the Department of Oral and Maxillofacial Surgery for possible bilateral coronoidectomy or coronoidotomy. CPH usually presents no symptoms apart from a progressive reduction of mouth opening over time. Diagnosis is often delayed, and patients may undergo unnecessary treatment procedures. Clinicians should be aware of this condition and exercise caution in the differential diagnosis of patients with chronic mandibular hypomobility.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제40권6호
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• pp.301-307
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• 2014

Coronoid process hyperplasia is a rare condition that causes mouth opening limitation, otherwise known as trismus. The elongated coronoid processes impinge on the medial surfaces of the zygomatic arches when opening the mouth, which limits movement of the mandible and leads to trismus. Patients with trismus due to coronoid process hyperplasia do not have any definite symptoms such as temporomandibular joint pain or sounds upon clinical examination, and no significant abnormal signs are observed on panoramic radiographs or magnetic resonance images of the temporomandibular joint. Thus, the diagnosis of trismus is usually very difficult. However, computed tomography can help with the diagnosis, and the condition can be treated by surgery and postoperative physical therapy. This paper describes four cases of patients who visited our clinic for trismus and were subsequently diagnosed with coronoid process hyperplasia. Three were successfully treated with a coronoidectomy and postoperative physical therapy.

• 대한치과의사협회지
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• 제17권1호통권116호
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• pp.25-28
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• 1979

An instance of difficulty in mouth opening as around 2mm due to impingement of fractured coronoid process and zygomatic arch in 30-year-old man who had met with a traffic accident was observed and surgical operation was done. After removal of the fractured coronoid process and elevation of the depressed malunited zygomatic arch, the patient could open mouth by now about 30mm.