Inoue D, et al. - Researchers have previously described the early clinical outcomes of a modular-neck stem identifying an early 2-year revision rate of 13% due to neck-stem corrosion. This study renews the findings to a midterm mean follow-up of 5 years. A consecutive retrospective review was designed to include a total of 186 neck-modular hips in 175 individuals with a mean follow-up period was 60.1 ± 22.9 months (range 24-100 months). They examined clinical findings, routine radiographs, detailed imaging (metal artifact reduction software – magnetic resonance imaging [MARS-MRI], Ultrasound [US]), and serum ion levels of Cobalt (Co) and Chromium (Cr). They conducted a survival analysis with the endpoint defined as revision total hip arthroplasty (THA) due to neck-stem corrosion. 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 feasible to consider clinical follow-up alone as symptoms, rather than blood testing for ion levels, appear to be the defining characteristic of failure.