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Modifications of spinopelvic parameters and acetabular orientation after spinal surgery for adult deformity in patient who underwent bilateral total hip arthroplasty.

The spine and the hip are two anatomical districts that have close biomechanical relationship. The management of their degenerative disorders involves an in-depth biomechanical analysis of the patient, in order to define the proper hip-spine relation, using different biomechanical classifications that have been proposed in recent years. The changes in the spino-pelvic and acetabular parameters induced by prosthetic hip surgery and spinal surgery must be carefully evaluated, calculated and foreseen in the pre-operative phase, as they play a crucial role in defining the clinical success or failure of the operations. In this paper we present a case of a patient who underwent spinal surgery after a bilateral THA analyzing both spino-pelvic parameters and acetabular orientation and highlighting the strict relations between spine and hip.