%0 Journal Article %T Femoral Stem Dislocation Caused by Trunnionosis Along with Adverse Local Tissue Reaction: A Case Report and a New Technique of Head to Cone Cementing %J The Archives of Bone and Joint Surgery %I Mashhad University of Medical Sciences, Iranian Society of Knee Surgery, Arthroscopy and Sports Tramatology,Iranian Orthopaedic Association %Z 2345-4644 %A Mirghaderi, Seyed Peyman %A Hoveidaei, Amir Human %A Sheikhbahaei, Erfan %A Motififard, Mehdi %A Moradi, Nader %A Moradi, Mansour %D 2022 %\ 10/01/2022 %V 10 %N 10 %P 911-915 %! Femoral Stem Dislocation Caused by Trunnionosis Along with Adverse Local Tissue Reaction: A Case Report and a New Technique of Head to Cone Cementing %K Arthroplasty %K Hip Dislocation %K Hip Prosthesis %K Long Term Adverse Effects %K Po stoperative complications %R 10.22038/abjs.2022.61214.3005 %X In total hip replacement (THR), fretting and corrosion at the modular head-neck junction (trunnionosis) may causeadverse local tissue reaction (ALTR). In this report, we presented a 34 years woman with a history of THR eight yearsago, presenting with acute pain and limping. The radiographic assessment revealed stem-head dislocation for whicha revision hip surgery was planned. Surprisingly, we observed pseudotumor and tissue necrosis resulting from thebody’s reaction to cobalt-chromium alloy. The revision surgery entailed pseudotumor debridement and replacing thefemoral head with a new metal head (size 36, long). Due to the separation of the femoral head on a stem, we fixedit on a stem using bone cement. The stem (Omnifit®, Stryker®) was well-fixed and retained to avoid fractures andinfection risk. This technique revealed an acceptable outcome without recurrence of ALTR after a one-year follow-up.Our findings suggest that stem dislocation secondary to trunnionosis might be a long-term complication after THRwith subsequent ALTR.Level of evidence: V %U https://abjs.mums.ac.ir/article_20985_eba34bb574a082e7f31fe16457a6a109.pdf