We report a case of posttraumatic false aneurysm of popliteal artery after a total knee arthroplasty in an 82-year-old woman. This case is characterized by the distinct history of trauma to the popliteal fossa in the immediate postoperative period and the location of false aneurysm. In addition, the clinical symptoms were similar to those of deep vein thrombosis. The ultrasonographic examination and computed tomography (CT) angiography confirmed the diagnosis on 6th day after the surgery. Ultrasonographic examination 1 day later revealed no increase in the size of false aneurysm. She was treated with open surgical repair. Presenting the difficulty in the diagnosis, unusual location, etiology, and its management is the intention of this case report.

A 77-year-old man sustained an acetabular fracture after falling from a staircase and landing on his right side. He fractured the anterior column of his acetabulum and the quadrilateral plate. He underwent a single-stage open reduction and internal fixation of the fracture combined with a dual mobility total hip arthroplasty (THA). He sustained a traumatic hip dislocation 1 month postoperatively. Closed reduction was attempted at another hospital, and the femoral stem was pulled out. We believe this was caused by the polyliner being hitched either to the acetabular cup or in the soft tissues around the ilium. We present this case to caution orthopaedic surgeons that dual mobility THA dislocations are difficult to diagnose as the polyliner is not clearly seen on X-rays, and reduction attempts may lead to worsening of an already difficult situation.

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In order to improve the likelihood of success and minimise complications, the patient's leg should be positioned with 90°of hip and knee flexion, the hip adducted and internally rotated. This leg position disengages the DM shell from the soft tissue or acetabulum and gentle traction can be applied. The leg should not be pulled in extension. The additional use of gentle force on the medial proximal thigh in the lateral direction will assist the reduction. DISCUSSIONIf a DM bearing is present, reduction should only be performed in theatre, under general anaesthesia and image intensifier guidance.This will help to prevent forcing the reduction when the large poly head is caught on the acetabulum or ilium and reduce the incidence of intraprosthetic dislocation, stem pull-out or other complications such as periprosthetic fracture.