Intracapsular fractures of mandibular condyle: diagnosis, treatment, and anatomical and pathological evaluations.

The aim of this study was to attempt to establish a correlation between condylar localized fracture, onset of anatomicopathological lesions of the articular structures, and determination of ankylosis so as to define appropriate diagnostic and therapeutic procedures. Clinical, arthroscopic, and histological studies were carried out in two patients with a severe temporomandibular joint disorder after a condylar localized fracture. Treatment included removal of the displaced fragments, condylar surface remodeling, suture of retrodiskal perforations, and diskal repositioning. The histological study of the condylar specimens revealed signs of osteoarthrosis of the articular surface and chondroid metaplasia of the bilaminar zone with early onset of ankylosis. Results of this study confirmed the presence of causal relations between condylar localized fracture and ankylosis with alterations in retrodiskal tissue. These relations are found in 1) tissue damage caused by bony fragments remaining in the articular cavity (underestimated and poorly treated fractures), 2) the lesion that occurs in association with mechanical trauma; and, particularly, c) the disk and retrodiskal impairments caused by catabolic and degenerative osteoarthrotic changes secondary to condylar marrow damage. Thus, timeliness and accuracy of the diagnosis of condylar localized fracture are most important, as are correct diagnosis and treatment before the onset of degenerative anatomicopathological lesions.