Objective. To identify whether gender and pelvis size affect the distances between anatomic landmarks of the posterior pelvis.

Objective: to study the anatomical relationship of TMJ with the adjacent anatomic landmarks and important nerves and vessels for the application of TMJ operation with arthroscopy.

Visual estimation, tape measurement between fixed landmarks, and the UG aligned on fixed and anatomic landmarks were compared with the CROM goniometer, which was used as the reference standard.