Transoral miniplate osteosynthesis of condylar neck fractures

Objective. In a retrospective study, we reviewed a series of 55 consecutive patients with 57 fractures of the condylar neck that were treated with tra nsoral miniplate osteosynthesis. Study design. Forty-one patients were included in a clinical follow-up stud y; the median length of study was 26.5 months (minimum, 7 months; maximum, 79 months). In a radiographic study, the positions of the condyle before op en reduction, after open reduction, and more than 6 months postoperatively were evaluated in 3 radiographic planes. A statistical analysis was perform ed to determine factors that lead to secondary instability of the reduced c ondyle and to correlate the actual position of the condyle with clinical pa rameters collected in follow-up examinations. Results. At the time of the follow-up examination, the median measurement o f the mandibular openings was 48.3 +/- 8.0 mm (minimum, 32 mm; maximum, 66 mm). A deviation of 2 mm to the operated side when opening was observed in 7 patients. The median range of laterotrusion was 10.0 mm to the fracture s ide and 9.0 mm to the opposite side. In 7 patients, radiographic follow-up more than 6 months postoperatively revealed a medial tilt of the proximal f ragment of 15 to 40 degrees despite a good immediate postoperative position of the condyle. This may be attributed to bone resorption in the fracture gap, together with a bending instability observed when titanium miniplates with a thickness of 0.9 mm were used. The position of the condyle at the fo llow-up examination did not correlate with clinical parameters. Conclusions. Transoral approach miniplate osteosynthesis of dislocated cond ylar neck fractures is indicated when visible scars in the head and neck re gion, which are encountered with other fixation techniques, must be avoided .