Abstract
We report the clinical, radiological and wear analysis of 52 consecutive MoM hip resurfacings (performed on 49 younger patients) to a mean follow-up of 9.2years. Every patient underwent X-ray and clinical evaluation (HHS). Ultrasonography of the hip was performed in all patients in order to identify possible cystic or solid mass in periprosthetic tissue. In case of mass >20mm, further MRI was performed to better analyse the characteristics of lesion. Five patients (five hips) had a revision. The overall survival rate was 90.38%. The average HHS at follow-up examination was 95.5 points. No progressive radiolucent areas and no sclerosis or osteolysis around the implants were found. The US and RMI imaging showed a pseudotumour formation in two patients (correlated with high metal ion levels in blood and urine), both asymptomatic. A significant positive correlation between inclination of the acetabular component and serum metal ion levels was found (r=0.64 and r=0.62 for cobalt and chromium, respectively).
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