Unexpected varus deformity and concomitant metal ion release and MRI findings of modular-neck hip stems : descriptive RSA study in 75 hips with 8 years’ follow-up
Background and purpose — Modular-neck hip stems have been identified with corrosion-related problems from the neck–stem junction. We report an ongoing varus deformity of modular-neck hip stems with simultaneous metal ion release observed during a study comparing the migration of modular vs. standard hip stems. Patients and methods — We followed 50 patients with modular and 25 with standard neck st