European Journal of Molecular & Clinical Medicine

Abstract

Background:The hip joint is multi-axial, and synovial ball and socket variety, in general, it can
be said that; in all joints, stability and range of movement are in inverse proportion to each
other; the hip joint provides a remarkable example of a high degree of both. Its stability is
largely the result of the adaptation of the articulating surfaces of acetabulum and femoral head
to each other and its great range of mobility results from the femur having a neck that is much
narrower than the equatorial diameter of the head.Total Hip Replacement (THA) dislocation is
defined as the complete loss of articulation contact between two artificial joint components.
Postoperative dislocation is still the most common early complication after THA and one of the
most common causes of early revision of primary THA.THA dislocation can be caused by 3
mechanisms or a combination of 2 mechanisms .Depending on the mechanical cause 3
dislocation directions can be observed, even though dislocation direction and component
positioning are not necessarily related, the direction of dislocation of THR is usually posterior
(77%) ,while anterior (23%) whereas superior or lateral dislocation has also been described.