The position ofthe condyle in the glenoid fossa is not fixed, but varies during life. It has been reported that the condyle moves when head posture changes.13
The force from the operation will displace the condyle even more. By measuring positional coordinates before operation (T1), within one week of operation (T2), and at the completion of orthodontic treatment (T3, at least six months postoperatively), we found that the positional changes from T1 to T2 were significant.
In patients with mandibular prognathism, the condyle moves outwards, backwards, and downwards by one week after BSSRO, which is consistent with previous studies.4,5 In a mandibular advancement operation, the condyle moved outwards, backwards, and downwards, which conflicts with previous reports.3,4,6
Changes in the position of the condyle after bilateral sagittal split ramus osteotomy in patients with mandibular retrusion and protrusion: a new condyle: fossa matching concept
BJOMS 2019
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