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Table 3 Three failures in the case series and their clinical outcomes

From: Early clinical and radiological outcomes of the new porous titanium shell in combination with locking screw in revision total hip arthroplasty

Case 1: A 77-year-old female with a Paprosky 3A defect experienced migration of the shell. She initially presented with a shell failure following acetabular revision for eccentric liner wear. The Redapt shell with locking screws was not used at the index revision. A second revision was planned to use the new porous shell but, unfortunately, augments were not available on the day and a jumbo shell was used with five locking screws for stability. The shell showed early migration but then stabilized and as the patient was pain-free, she opted not to have any further surgery.

Case 2: A 44-year-old female had multiple surgeries in another country for developmental dysplasia of the hip (DDH) with a query Chiari osteotomy, and eventually had a THR at the age of 32. The primary hip had a high hip centre, and this eventually failed with failure of the primary shell and pelvic discontinuity. The patient had a Paprosky 3A defect and had no issues until 34 months postoperatively when repeat radiograph showed medialization of the shell. Currently, there are plans for a revision surgery, but this requires planning with a custom-made implant over the next coming months.

Case 3: An 82-year-old female with a Paprosky 2C defect originally underwent a staged revision for prosthetic joint infection (PJI) (McPherson IIIC2). She underwent revision of articulation from lipped liner to polar dual mobility liner without revision of the porous revision shell and has remained stable at 45-months postoperatively.