A Unique Variant of Intra-Prosthetic Dislocation in Dual Mobility Articulation Total Hip Arthroplasty-Displacement of Metal Liner.

Total hip arthroplasty stands as a milestone in surgical success for alleviating hip arthritis-related pain and enhancing patients' quality of life. While complications persist, advancements like dual-mobility articulation aims to mitigate risks. This manuscript presents an unprecedented unique complication in a 60-year-old woman with a revision dual mobility THA. The metal liner displaced from its original position causing impingement at the medial aspect of the femoral neck and deformation of the acetabular shell. Radiographic evidence revealed the displaced liner cutting into the femoral neck. This unusual complication prompted a re-revision, revealing severe damage to the acetabular cup and femoral neck. While intra-prosthetic dislocations in dual-mobility articulations are recognized, this case deviates from conventional types, emphasizing the need for ongoing vigilance in prosthesis design and patient follow-up. This case report highlights a new variant of intra-prosthetic dislocations to the existing literature on dual-mobility THA complications.