Total hip arthroplasty challenge in abnormal spinopelvic motion

Abstract

Mohamed Solyman kabil*

Total hip arthroplasty (THA) late dislocation is a main challenge. It is still an area of a research gap. Defining the late dislocation period is also a point of controversy, Charnely et.al define the period as more than five years, other authors define it as 1 to 2 years after primary THA.A dynamic coordinated continuous motion of the spine, pelvis, and hip creates the spinopelvic balance; during standing, the pelvis is tilted anteriorly , lumbar spine is lordotic, and hip is in extension, sagittal balance is reached by locating the trunk on the pelvis and the acetabulum over the femoral head. Changing to sitting, the hip joint does not flex to 900 but the following spinoplevic motions occur to accommodate and provides the biologic acetabular opening; The pelvis is tilted posteriorely by 200, lumbar spine loses some lordosis, and the acetaulum tilted posteriorely.Aging and spine diseases alter this normal spinopelvic balance. Different classifications are described for the abnormal spinopelvic motion.