Inoue D, et al. - A brief five-year follow-up study was conducted to present individuals with modular-neck total hip arthroplasty. Researchers designed a consecutive retrospective review of 186 modular-neck hips in 175 individuals with a mean follow-up period was 60.1 ± 22.9 months (range 24-100). Clinical findings, routine radiographs, detailed imaging (metal artifact reduction software-magnetic resonance imaging, ultrasound), and serum ion levels of cobalt and chromium were assessed. They conducted a survival analysis with the endpoint defined as revision total hip arthroplasty due to neck-stem corrosion. Forty one hips (22.0%) for neck-stem corrosion were revised. Clinical symptoms (groin pain ± local swelling) were consistently present in those that came for revision. Compared with previous short-term results, the revision rate for this modular-neck stem due to neck-stem corrosion at mid-term follow-up almost doubled. It appears reasonable to recognize clinical follow-up alone as symptoms, rather than blood testing for ion levels, appear to be the defining characteristic of failure.