Long-term outcome of two-incision total hip arthroplasty with intraoperative imageless navigation for cup placement: A concise followup, at ten to twelve years, of a previous report

Background: We previously reported at a minimum follow-up of one-year results of the use of imageless navigation for cup placement in primary two-incision total hip arthroplasties (THA). The purpose of the present report is to update that study and report the ten to twelve-year outcomes. Materials and methods: Twelve consecutive patients underwent minimally invasive two-incision (MIS-2) THA done by a single experienced surgeon between September 2003 and January 2005. A retrospective chart review was performed to investigate clinical assessment (the Harris hip score [HHS] and the Western Ontario and McMaster University Osteoarthritis Index [WOMAC] scale), radiographic analysis, the complications and survivorship. Results: At the latest follow-up evaluation, the HHS and WOMAC scale were 95.4 and 96.5 points respectively. There were no radiographic evidence of definite loosening. Injury to the lateral femoral cutaneous nerve occurred in 4 hips. There were no dislocation, no periprosthetic joint infection or fracture. The 10- year Kaplan-Meier analysis revealed 100% survival rate with revision for any reason as the end point. Conclusion: This study demonstrated that imageless navigation system for the two-incision THA give excellent long-term results.