Clinical Findings of Closed Lock:1. Untreated Unilateral Closed Lock on Initial Visit

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We studied the findings of the initial visit to our clinic in 71 patients (9 males and 62 females) with unilateral closed lock which hadn't been treated. All of the patients were diagnosed by either MRI or arthrography. The average age of the patients was 33.4 years with a range of 13 to 81 years. The incidence of closed lock was high between the ages of 15 to 29 years. The average maximal opening was 29.1mm with a range of 14 to 55mm. The duration from the onset of closed lock to the initial visit was mainly within 30 days, although the average was 106 days. The degree of pain during chewing and during opening and closing, and the disturbance to daily life were moderate according to visual analog scales. The average maximal opening was significantly smaller in patients with a short closed lock period (1 to 30 days) than in those with a long one (more than 30 days). The average maximal opening was larger in patients under 20 years than in those 20 years old or more. The fact that 7 patients were able to open the mouth more than 40mm, that 19 patients hadn't had any history of clicking, and that 4 patients had clicking at the time of initial examination indicates that MRI or arthrography is important for the confirmation of closed lock, as clinical diagnosis in itself may not identify this condition.
一般社団法人日本顎関節学会の論文