A new strategy to reconstruct type III acetabular bone defect associated with inflammatory pseudotumor: combined medial and lateral acetabular bone grafting: A case report.

RATIONALE: Inflammatory pseudotumor has been commonly reported in patients undergoing total hip arthroplasty (THA).

PATIENT CONCERNS: We reported a patient who had a massive intra-pelvic pseudotumour and acetabular bone defect underwent two-stage revision THA.

DIAGNOSES: A new surgical strategy for pseudotumor after THA is performed.

INTERVENTIONS: Thorough debridement intra-pelvic pseudotumour via Smith-Petersen approach, bone grafting on iliac medial surface and plate-screw internal fixation were performed in the first stage, followed by revision of the loosened prosthesis to a cementless primary prosthesis in the second stage.

OUTCOMES: A follow-up for 5 years showed satisfactory recovery of function.

LESSONS: This surgical revision is less invasive than conventional methods, resulting in a stable and well-functioning hip joint after mid-term follow-up for 5 years.