Increase in type II collagen turnover after iron depletion in patients with hereditary haemochromatosis.

OBJECTIVE: To determine the effects of iron depletion on serum levels of joint biomarkers and on joint symptoms in patients with hereditary haemochromatosis (HH). METHODS: Levels of biomarkers were measured in 18 patients with HH at the time of diagnosis and after iron depletion. The markers were type II collagen degradation (Coll2-1) and its nitrated form (Coll2-1NO(2)), type II procollagen synthesis (CPII), MPO, COMP and HA. For each patient, demographic data were collected and the global joint pain (visual analogue scale) was assessed before and after iron depletion by phlebotomy. RESULTS: A total of 18 patients [10 males; mean (s.d.) age 48 (11) years] were homozygous for the C282Y mutation. No patient had liver dysfunction. Ferritin level before iron removal was 627.5 (range 133-3276) microg/l, and duration of the iron depletion phase was 295 (70-670) days. Serum levels of both Coll2-1 and CPII were significantly increased from diagnosis after iron depletion: 80.1 (55.6-113.5) vs 96.0 (48.8-136.3) nM (P = 0.004) and 731.4 (374.2-1012.3) vs 812.8 (535.8-1165.6) ng/ml (P = 0.03), respectively. Levels of other biomarkers were not modified by iron depletion. Ferritin level, which at baseline was correlated with body iron store (r = 0.63; P = 0.008), was significantly correlated with HA level measured before iron depletion (r = 0.60; P = 0.01). Global joint pain was not correlated with ferritin concentration and did not significantly decrease after iron depletion: 43 (19-73) vs 36 (16-67) mm (P = 0.07). CONCLUSIONS: In patients with HH, cartilage homoeostasis is modified by iron excess and an increase in type II collagen turnover occurs after excess iron removal.

Efficacity and feasibility of vertebroplasty for severe vertebral fracture: a retrospective study of 12 vertebroplasties.

Vertebroplasty is commonly contraindicated for severe vertebral fractures, or vertebra plana. However, we decided after multidisciplinary staff decision to perform vertebroplasty for few severe vertebral fractures which were still painful after optimal medical treatment. We retrospectively studied the charts of patients who benefited from vertebroplasty for severe vertebral body compression fracture between May 2006 and January 2012 in a rheumatology department. Clinical and biological data were collected and patients were consulted to assess effectiveness of that technique. We performed vertebroplasty of 12 severe vertebral fractures in 10 patients (nine women and one man). Mean age was 74.9±10.7 years. Mean VAS score was 9/10±1.15 before vertebroplasty and 2.4±2 after. Global improvement was 80% and patient satisfaction was 7/10. After vertebroplasty, use of drugs was significantly reduced or even stopped. The complications observed were: three infraclinical cement leakages, one haematoma at the site of the puncture, one atrial fibrillation and one classic pulmonary embolism. Mean follow-up was 28.6±22.3 months. Vertebroplasty is indeed a delicate procedure for severe vertebral fracture but quickly and sustainably effective.