Early reoccurrence of traumatic posterior atlantoaxial dislocation without fracture: A case report.

Background: In general, atlantoaxial dislocation is rare due to the stability of the C1-C2 complex. Traumatic atlantoaxial dislocations are usually anterior and accompanied by odontoid fractures. Posterior atlantoaxial dislocations are rare, and complete posterior dislocation without associated fracture is even more rare.

Age-related Changes of Posterior Tibial Slope and Its Roles in Anterior Cruciate Ligament Injury.

Nearly all previous studies in posterior tibial slope (PTS) and anterior cruciate ligament (ACL) injuries ignored age-related changes, and the published data are inconsistent. The objective of this study was to reveal age-related changes of PTS and its roles in ACL injury. Data for 2618 lower limbs were included initially based on the availability of lateral radiographs and a suitable femoro-tibial angle.