Abstract Background An 84-year-old female presented to Geriatric Medicine out-patient clinic with many years of persistent right hip pain, generalised myalgia; and several months of constipation, weight loss and persistent elevation of C-reactive protein and Erythrocyte Sedimentation Rate. The General Practitioner's concern was occult neoplasm. History of right hip arthroplasty in 2011. 6 years prior, she had wide local excision and adjuvant radiotherapy for a grade 3, “triple negative”, invasive ductal carcinoma of the right breast. Serial imaging identified a right parasternal, internal mammary chain neurofibroma. A Rheumatologist had administered intra-articular steroid to both glenohumeral joints for plain X-ray confirmed osteoarthritis, in the absence of serological vasculitic or autoimmune rheumatological disease. Benefit was transient. Her Oncologist had arranged MRI spine for “sciatica” demonstrating L3/4 and L4/5 stenosis and a large right adnexal cyst. Subsequently, the Gynaecology team assessed and planned interval MRI pelvis as initial MRI suggested a right partial hydrosalpinx, left internal chain lymphadenopathy and nodule adjacent to sacroiliac joint. Methods History, examination and imaging results were checked against the Medical Device Alert number 18 from the Medicines and Healthcare products Regulatory Agency (UK) in 2017. Oxford Hip Score Assessment was 29. Lymphatic drainage from medial hip joint is towards right iliac chain. Results In the absence of Gadolinium based contrast agents within 96hours, metal testing demonstrated: Serum Cobalt was 232nmol/L or 13.7 ug/L; Serum Chromium was 78.8nmol/L or 4.1ug/L; Chromium Urine: Creatinine Urine Ratio was 24.54nmol/mmol; and Cobalt Urine: Creatinine Urine Ratio73.96nmol/mmol. These elevated blood and urine results confirmed metal-on-metal hip disease. Conclusion Consider symptomatic metal-on-metal hip disease with soft-tissue involvement in patients presenting with post-hip arthroplasty joint pain, generalised myalgia and raised inflammatory markers; particularly if there is unexplained ipsilateral internal iliac chain lymphadenopathy and pelvic fluid collections. If confirmed, metalwork explanation is the treatment.
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