CT analysis of bone fragment motion in sagittal fracture of the mandibular condyle / 中华创伤杂志

ABSTRACT

Objective To analyze the separation and displacement of bone fragments in sagittal fracture of the mandibular condyle (SFMC),understand the motion type and guide clinical treatment and development of related surgical instruments.Methods Forty-five patients (52 sides) with SFMC treated between October 2008 and October 2012 were enrolled; 32 patients (36 sides) were males and 13 patients (16 sides) were females.According to the Neff classification,there were 20 sides with type A,28 sides type B and 4 sides type M.All the patients underwent CT scan and were classified based on measurements of distance and angle of displaced bone fragments.Results Patients were categorized into type Ⅰ on 20 sides (type Ⅰ A on 14 sides and type Ⅰ B on 6 sides),type Ⅱ on 27 sides (type Ⅱ A on 11 sides and type ⅡB on 16 sides),type ⅢB in 1 side and type Ⅳ in4 sides.Mean displacement of bone fragments was 12 mm (range,4-16 mm) ; mean deviation angle was 34°(range,11°-43°) ; mean descending distance was 13 mm (range,6-18 mm).Conclusion CT analysis results show that,mast bone fragments in SFMC move slightly.