High Early Major Complication Rate After Revision for Mechanically Assisted Crevice Corrosion in Metal-on-Polyethylene Total Hip Arthroplasty.

BACKGROUND

Failed total hip arthroplasty caused by mechanically assisted crevice corrosion (MACC) has serious consequences such as adverse local tissue reaction. Revision is currently indicated for significant hip pain, stiffness, and dysfunction; hip instability; progressive bone loss; and soft tissue destruction. Outcomes of this revision surgery are not yet completely understood.

METHODS

We examined the surgical outcomes at a minimum of 6 months (average, 25; range, 7-68 months) in a cohort of 27 consecutive patients who underwent revision total hip arthroplasty for MACC associated with a single implant vendor and taper type.

RESULTS

Major orthopedic complications occurred in 7 of 27 patients (25.9%), each after the original revision surgery. Five additional major complications occurred in subsequent surgeries. Postoperative hip dislocation occurred in 6 of 27 (22.2%), deep infection occurred in 3 of 27 (11.1%), and aseptic acetabular loosening, seroma requiring irrigation and debridement, pulmonary embolism, periprosthetic fracture, and reintubation each occurred in 1 of 27 (3.7%). Harris hip scores improved significantly with surgery (P = .0002), but overall, scores were lower for those who had major complications (70.9 vs 89.2), and only 20 of 27 patients (74.1%) had good or excellent outcomes.

CONCLUSION

Symptomatic MACC is a potentially devastating diagnosis, because of decreased soft tissue and bone viability associated with adverse local tissue reaction. This leads to a high early major complication rate.